Ellington Financial (EFC) 10-K 15 Mar 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 09, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	Ellington Financial LLC
Entity Central Index Key	1,411,342
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,545,290
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 470,555,243

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents		$ 47,233	$ 123,274
Restricted cash		425	655
Investments, financial derivatives, and repurchase agreements:
Investments, at fair value (Cost – $2,071,754 and $1,525,710)		2,071,707	1,505,026
Financial derivatives–assets, at fair value (Net cost – $31,474 and $40,724)	[1]	28,165	35,595
Repurchase agreements, at fair value (Cost – $155,109 and $185,205)	[1]	155,949	184,819
Total investments, financial derivatives, and repurchase agreements		2,255,821	1,725,440
Due from brokers		140,404	93,651
Receivable for securities sold and financial derivatives		476,000	445,112
Interest and principal receivable		29,688	21,704
Other assets		43,770	3,359
Total Assets		2,993,341	2,413,195
Investments and financial derivatives:
Investments sold short, at fair value (Proceeds – $640,202 and $589,429)		642,240	584,896
Financial derivatives–liabilities, at fair value (Net proceeds – $27,463 and $12,012)	[1]	36,273	18,687
Total investments and financial derivatives		678,513	603,583
Reverse repurchase agreements	[1]	1,209,315	1,033,581
Due to brokers		1,721	12,780
Payable for securities purchased and financial derivatives		202,703	85,168
Other secured borrowings (Proceeds – $57,909 and $24,086)		57,909	24,086
Other secured borrowings, at fair value (Proceeds – $125,105 and $0)		125,105	0
Senior notes, net		84,771	0
Accounts payable and accrued expenses		3,885	3,327
Base management fee payable to affiliate		2,113	2,416
Interest and dividends payable		5,904	3,460
Other liabilities		441	17
Total Liabilities		2,372,380	1,768,418
Total Equity		620,961	644,777
TOTAL LIABILITIES AND EQUITY		2,993,341	2,413,195
Commitments and contingencies (Note 17)
ANALYSIS OF EQUITY:
Common shares, no par value, 100,000,000 shares authorized; (31,335,938 and 32,294,703 shares issued and outstanding)		589,722	627,620
Additional paid-in capital – Long term incentive plan units		10,377	10,041
Total Shareholders' Equity		600,099	637,661
Non-controlling interests		20,862	7,116
Total Equity		$ 620,961	$ 644,777
PER SHARE INFORMATION:
Common shares (in usd per share)		$ 19.15	$ 19.75
[1]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Investments at value, cost	$ 2,071,754	$ 1,525,710
Financial derivatives–assets, at fair value Net cost	31,474	40,724
Repurchase agreements, cost	155,109	185,205
Investments sold short at value, proceeds	(640,202)	(589,429)
Financial derivatives-liabilities, at fair value Net proceeds	(27,463)	(12,012)
Other secured borrowings proceeds	(57,909)	(24,086)
Other secured financing, at fair value-Proceeds	$ (125,105)	$ 0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	31,335,938	32,294,703
Common stock, shares outstanding	31,335,938	32,294,703

Consolidated Condensed Schedule

Consolidated Condensed Schedule Of Investments Consolidated Condensed Schedule of Investments (Cash Equivalents) - Cash Equivalents [Member] - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Schedule of Investments [Line Items]
Money Market Funds, at Carrying Value		$ 26,500	[1]	$ 90,000	[2]
Money Market Funds, at Cost		$ 26,500	[1]	$ 90,000	[2]
Investment owned as a percentage of equity		4.27%	[1],[3]	13.96%	[2],[4]
BlackRock Liquidity Funds FedFund Portfolio, Institutional Class Shares [Member]
Schedule of Investments [Line Items]
Money Market Funds, at Carrying Value	[2]			$ 50,000
Investment Owned, Balance, Shares	[2]			50,000
Rate	[2]			0.42%
Various Money Market Funds [Member]
Schedule of Investments [Line Items]
Money Market Funds, at Carrying Value		$ 26,500	[1]	$ 40,000	[2]
Investment Owned, Balance, Shares		26,500	[1]	40,000	[2]
Rate	[1]	1.17%
Various Money Market Funds [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	[2]			0.44%
Various Money Market Funds [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	[2]			0.45%
[1]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[2]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[3]	Classification percentages are based on Total Equity.
[4]	Classification percentages are based on Total Equity.

Consolidated Condensed Schedul5

Consolidated Condensed Schedule Of Investments (Long Investments) - USD ($) shares in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Schedule of Investments [Line Items]
Investments Fair Value		$ 2,071,707,000		$ 1,505,026,000
Investment Owned, at Cost		$ 2,071,754,000		$ 1,525,710,000
Percentage collaterallized by GNRCMO certificates		100.00%		100.00%
Non-performing loans, maturity date not applicable		$ 23,900,000		$ 28,600,000
Mortgage Loans in Process of Foreclosure, Amount		$ 5,200,000		$ 3,200,000
Unrated But Agency-Guaranteed [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		160.32%		139.27%
Long Investment Aaa Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity				0.84%
Long Investment Aa Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity				0.03%
Long Investment A Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		0.81%		0.05%
Long Investment BBB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		2.62%		2.60%
Long Investment BB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		68.03%		30.24%
Long Investment Unrated Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		101.85%		60.39%
Related Party-Consumer Loans Titled in Name of Related Party [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		$ 11,700,000		$ 7,600,000
Purchasing Entity [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		$ 114,500,000		43,200,000
Related Party 3 [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust				$ 7,300,000
Principal And Interest - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		123.80%	[1],[2],[3],[4]	121.61%	[5],[6],[7],[8]
Investments Fair Value		$ 768,751,000	[1],[3],[4]	$ 784,132,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 130,885,000	[1],[3],[4]	$ 147,479,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 138,033,000	[1],[3],[4]	$ 156,144,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-09	[1],[3],[4]	2042-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-11	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 115,008,000	[1],[3],[4]	$ 121,756,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 121,154,000	[1],[3],[4]	$ 128,798,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-11	[1],[3],[4]	2043-08	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-12	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 77,724,000	[1],[3],[4]	$ 58,682,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 80,245,000	[1],[3],[4]	$ 60,451,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-09	[1],[3],[4]	2043-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-12	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 60,698,000	[1],[3],[4]	$ 67,681,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 65,178,000	[1],[3],[4]	$ 73,305,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-10	[1],[3],[4]	2041-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-12	[1],[3],[4]	2046-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 51,851,000	[1],[3],[4]	$ 51,402,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 53,894,000	[1],[3],[4]	$ 54,019,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.50% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2028-03	[1],[3],[4]	2028-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.50% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-03	[1],[3],[4]	2031-11	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 47,555,000	[1],[3],[4]	$ 40,722,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 50,980,000	[1],[3],[4]	$ 44,010,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.50% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-09	[1],[3],[4]	2043-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.50% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-12	[1],[3],[4]	2046-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 42,239,000	[1],[3],[4]	$ 21,855,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 44,414,000	[1],[3],[4]	$ 23,346,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-07	[1],[3],[4]	2045-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-12	[1],[3],[4]	2046-12	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 3.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 33,982,000	[1],[3],[4]	$ 6,231,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 35,235,000	[1],[3],[4]	$ 6,513,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 3.50% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-07	[1],[3],[4]	2046-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 3.50% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-12	[1],[3],[4]	2046-12	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 5.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 32,061,000	[1],[3],[4]	$ 44,796,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Investments Fair Value		$ 34,664,000	[1],[3],[4]	$ 49,062,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 5.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2035-10	[1],[3],[4]	2035-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 5.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-12	[1],[3],[4]	2044-12	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 23,002,000	[1],[3],[4]	$ 25,244,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 23,753,000	[1],[3],[4]	$ 25,993,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.50% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-01	[1],[3],[4]	2042-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.50% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-09	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 21,561,000	[1],[3],[4]	$ 6,568,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 22,924,000	[1],[3],[4]	$ 7,099,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-09	[1],[3],[4]	2045-08	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Four Point Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-12	[1],[3],[4]	2046-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) Three Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 20,544,000	[1],[3],[4]	$ 22,073,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Investments Fair Value		$ 20,986,000	[1],[3],[4]	$ 22,730,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) Three Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-04	[1],[3],[4]	2030-04	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) Three Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-09	[1],[3],[4]	2032-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Fifteen Year) Three Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 9,405,000	[1],[3],[4]	$ 9,219,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 9,764,000	[1],[3],[4]	$ 9,686,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Fifteen Year) Three Point Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2028-09	[1],[3],[4]	2028-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Fifteen Year) Three Point Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-12	[1],[3],[4]	2030-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) Three Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 8,960,000	[1],[3],[4]	$ 10,120,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 9,221,000	[1],[3],[4]	$ 10,379,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) Three Point Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-02	[1],[3],[4]	2030-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) Three Point Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-09	[1],[3],[4]	2046-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 4.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 8,156,000	[1],[3],[4]	$ 9,968,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 8,562,000	[1],[3],[4]	$ 10,596,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 4.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2026-06	[1],[3],[4]	2026-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 4.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2031-05	[1],[3],[4]	2031-05	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 5,410,000	[1],[3],[4]	$ 6,714,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Investments Fair Value		$ 5,888,000	[1],[3],[4]	$ 7,408,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-09	[1],[3],[4]	2043-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-01	[1],[3],[4]	2044-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Four Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2037-06
Current Principal/Notional Amount		$ 4,981,000	[1],[3],[4]	$ 75,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 5,159,000	[1],[3],[4]	$ 77,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Four Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2037-06
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Four Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2047-12
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2030-04
Current Principal/Notional Amount		$ 3,833,000	[1],[3],[4]	$ 3,030,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Investments Fair Value		$ 3,912,000	[1],[3],[4]	$ 3,119,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2030-04
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2032-09
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 3,579,000	[1],[3],[4]	$ 1,523,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Investments Fair Value		$ 3,587,000	[1],[3],[4]	$ 1,518,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-07	[1],[3],[4]	2043-07	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-10	[1],[3],[4]	2045-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Three Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[1],[3],[4]	$ 3,519,000
Rate	[1],[3],[4]	3.00%
Investments Fair Value	[1],[3],[4]	$ 3,547,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2042-11
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2042-12
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Three Point Seven Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2047-07
Current Principal/Notional Amount	[1],[3],[4]	$ 2,906,000
Rate	[1],[3],[4]	3.75%
Investments Fair Value	[1],[3],[4]	$ 3,025,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Four Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2041-05
Current Principal/Notional Amount	[1],[3],[4]	$ 2,877,000
Rate	[1],[3],[4]	4.50%
Investments Fair Value	[1],[3],[4]	$ 3,021,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Fifteen Year) Four Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2026-04	[1],[3],[4]	2026-04	[5],[7],[8]
Current Principal/Notional Amount		$ 2,794,000	[1],[3],[4]	$ 3,619,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 2,973,000	[1],[3],[4]	$ 3,905,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 4.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-05	[1],[3],[4]	2044-05	[5],[7],[8]
Current Principal/Notional Amount		$ 2,671,000	[1],[3],[4]	$ 2,726,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 2,875,000	[1],[3],[4]	$ 2,968,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 2,791,000	[1],[3],[4]	$ 2,195,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Investments Fair Value		$ 2,804,000	[1],[3],[4]	$ 2,193,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-01	[1],[3],[4]	2042-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-06	[1],[3],[4]	2045-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Associatin Pools (Thirty Year) 5.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-10	[1],[3],[4]	2039-10	[5],[7],[8]
Current Principal/Notional Amount		$ 2,335,000	[1],[3],[4]	$ 2,896,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Investments Fair Value		$ 2,569,000	[1],[3],[4]	$ 3,216,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Twenty Year) Four Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2033-12	[1],[3],[4]	2033-12	[5],[7],[8]
Current Principal/Notional Amount		$ 1,633,000	[1],[3],[4]	$ 2,043,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 1,728,000	[1],[3],[4]	$ 2,172,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Fifteen Year) Four Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2029-02	[1],[3],[4]	2029-02	[5],[7],[8]
Current Principal/Notional Amount		$ 1,463,000	[1],[3],[4]	$ 1,734,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 1,531,000	[1],[3],[4]	$ 1,842,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Six Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 1,207,000	[1],[3],[4]	$ 1,793,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Investments Fair Value		$ 1,360,000	[1],[3],[4]	$ 2,049,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Six Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-09	[1],[3],[4]	2039-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Six Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-02	[1],[3],[4]	2040-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) Three Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 1,175,000	[1],[3],[4]	$ 3,030,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Investments Fair Value		$ 1,193,000	[1],[3],[4]	$ 3,109,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) Three Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2028-06	[1],[3],[4]	2028-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) Three Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-03	[1],[3],[4]	2030-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Twenty Year) 4.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2033-12	[1],[3],[4]	2033-12	[5],[7],[8]
Current Principal/Notional Amount		$ 1,023,000	[1],[3],[4]	$ 1,156,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 1,099,000	[1],[3],[4]	$ 1,254,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 6.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2040-05
Current Principal/Notional Amount		$ 864,000	[1],[3],[4]	$ 1,369,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Investments Fair Value		$ 969,000	[1],[3],[4]	$ 1,553,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 6.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2039-04
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 6.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2040-05
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Three Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2030-10
Current Principal/Notional Amount		$ 644,000	[1],[3],[4]	$ 165,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 647,000	[1],[3],[4]	$ 168,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Three Point Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2030-10
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Three Point Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2032-02
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Five Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2033-08
Current Principal/Notional Amount		$ 516,000	[1],[3],[4]	$ 496,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Investments Fair Value		$ 565,000	[1],[3],[4]	$ 551,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Five Point Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2033-08
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Five Point Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2038-11
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-07	[1],[3],[4]	2044-07	[5],[7],[8]
Current Principal/Notional Amount		$ 488,000	[1],[3],[4]	$ 498,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Investments Fair Value		$ 526,000	[1],[3],[4]	$ 543,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Three Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2026-04
Current Principal/Notional Amount	[1],[3],[4]	$ 492,000
Rate	[1],[3],[4]	3.50%
Investments Fair Value	[1],[3],[4]	$ 504,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Three Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2030-06
Current Principal/Notional Amount		$ 150,000	[1],[3],[4]	$ 1,689,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Investments Fair Value		$ 150,000	[1],[3],[4]	$ 1,694,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Three Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2030-05
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Three Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2030-06
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Three Point Two Eight Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2042-06
Current Principal/Notional Amount	[1],[3],[4]	$ 112,000
Rate	[1],[3],[4]	3.28%
Investments Fair Value	[1],[3],[4]	$ 112,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.55% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2065-01
Current Principal/Notional Amount	[5],[7],[8]			$ 5,219,000
Rate	[5],[7],[8]			4.55%
Investments Fair Value	[5],[7],[8]			$ 5,648,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.44% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2066-11
Current Principal/Notional Amount	[5],[7],[8]			$ 4,942,000
Rate	[5],[7],[8]			4.44%
Investments Fair Value	[5],[7],[8]			$ 5,383,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.60% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[5],[7],[8]			$ 10,504,000
Rate	[5],[7],[8]			4.60%
Investments Fair Value	[5],[7],[8]			$ 11,351,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.60% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2063-12
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.60% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six One Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Current Principal/Notional Amount	[5],[7],[8]			$ 3,892,000
Rate	[5],[7],[8]			4.61%
Investments Fair Value	[5],[7],[8]			$ 4,216,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.42% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2061-07
Current Principal/Notional Amount	[5],[7],[8]			$ 3,518,000
Rate	[5],[7],[8]			4.42%
Investments Fair Value	[5],[7],[8]			$ 3,741,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Thirty Year) Two Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2046-10
Current Principal/Notional Amount	[5],[7],[8]			$ 3,513,000
Rate	[5],[7],[8]			2.50%
Investments Fair Value	[5],[7],[8]			$ 3,414,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.48% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Current Principal/Notional Amount	[5],[7],[8]			$ 3,123,000
Rate	[5],[7],[8]			4.48%
Investments Fair Value	[5],[7],[8]			$ 3,361,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Two Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-10
Current Principal/Notional Amount	[5],[7],[8]			$ 3,043,000
Rate	[5],[7],[8]			4.62%
Investments Fair Value	[5],[7],[8]			$ 3,303,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Eight Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[5],[7],[8]			$ 6,200,000
Rate	[5],[7],[8]			4.68%
Investments Fair Value	[5],[7],[8]			$ 6,703,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Eight Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2063-11
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Eight Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-09
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) 3.00% | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2043-06
Current Principal/Notional Amount	[5],[7],[8]			$ 1,275,000
Rate	[5],[7],[8]			3.00%
Investments Fair Value	[5],[7],[8]			$ 1,258,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.57% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2065-01
Current Principal/Notional Amount	[5],[7],[8]			$ 2,945,000
Rate	[5],[7],[8]			4.57%
Investments Fair Value	[5],[7],[8]			$ 3,186,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Four Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2065-03
Current Principal/Notional Amount	[5],[7],[8]			$ 2,459,000
Rate	[5],[7],[8]			4.64%
Investments Fair Value	[5],[7],[8]			$ 2,672,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pool (Other) Five Point Four Nine Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2060-04
Current Principal/Notional Amount	[5],[7],[8]			$ 2,433,000
Rate	[5],[7],[8]			5.49%
Investments Fair Value	[5],[7],[8]			$ 2,551,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Three Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-06
Current Principal/Notional Amount	[5],[7],[8]			$ 1,943,000
Rate	[5],[7],[8]			4.63%
Investments Fair Value	[5],[7],[8]			$ 2,103,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 5.51% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2060-02
Current Principal/Notional Amount	[5],[7],[8]			$ 1,916,000
Rate	[5],[7],[8]			5.51%
Investments Fair Value	[5],[7],[8]			$ 2,016,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 5.57% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2060-02
Current Principal/Notional Amount	[5],[7],[8]			$ 1,675,000
Rate	[5],[7],[8]			5.57%
Investments Fair Value	[5],[7],[8]			$ 1,756,000
Interest Only - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		2.03%	[1],[2],[3],[4]	1.89%	[5],[6],[7],[8]
Investments Fair Value		$ 12,594,000	[1],[3],[4]	$ 12,189,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 21,942,000	[1],[3],[4]	$ 26,883,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 3,686,000	[1],[3],[4]	$ 4,547,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-02	[1],[3],[4]	2045-02	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-06	[1],[3],[4]	2045-06	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 6.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2038-06
Current Principal/Notional Amount		$ 5,867,000	[1],[3],[4]	$ 1,123,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Investments Fair Value		$ 1,173,000	[1],[3],[4]	$ 263,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 6.00% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2038-06
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 6.00% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2039-08
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 6,286,000	[1],[3],[4]	$ 9,820,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 928,000	[1],[3],[4]	$ 1,414,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.50% [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2020-12	[1],[3],[4]	2020-12	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.50% [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-06	[1],[3],[4]	2044-06	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Four Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2041-02
Current Principal/Notional Amount		$ 5,437,000	[1],[3],[4]	$ 3,844,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Investments Fair Value		$ 914,000	[1],[3],[4]	$ 615,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Four Point Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2041-02
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Four Point Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2044-07
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Five Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-10	[1],[3],[4]	2040-10	[5],[7],[8]
Current Principal/Notional Amount		$ 4,116,000	[1],[3],[4]	$ 1,201,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Investments Fair Value		$ 907,000	[1],[3],[4]	$ 163,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 5.50% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-11	[1],[3],[4]	2043-11	[5],[7],[8]
Current Principal/Notional Amount		$ 4,660,000	[1],[3],[4]	$ 6,303,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Investments Fair Value		$ 801,000	[1],[3],[4]	$ 1,137,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Three Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-12	[1],[3],[4]	2032-12	[5],[7],[8]
Current Principal/Notional Amount		$ 4,350,000	[1],[3],[4]	$ 5,099,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 628,000	[1],[3],[4]	$ 808,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2038-11
Current Principal/Notional Amount	[1],[3],[4]	$ 7,145,000
Rate	[1],[3],[4]	5.00%
Investments Fair Value	[1],[3],[4]	$ 598,000
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Four Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 4,185,000	[1],[3],[4]	$ 5,354,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 521,000	[1],[3],[4]	$ 648,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Four Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-05	[1],[3],[4]	2039-05	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Four Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-11	[1],[3],[4]	2043-11	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Five Point FIve Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2039-01
Current Principal/Notional Amount		$ 5,074,000	[1],[3],[4]	$ 763,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Investments Fair Value		$ 494,000	[1],[3],[4]	$ 79,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Five Point FIve Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2039-01
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Five Point FIve Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2039-09
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 4,100,000	[1],[3],[4]	$ 6,695,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Investments Fair Value		$ 493,000	[1],[3],[4]	$ 806,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Five Percent [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2038-01	[1],[3],[4]	2038-01	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Five Percent [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-05	[1],[3],[4]	2040-05	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association SIx Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-01	[1],[3],[4]	2040-01	[5],[7],[8]
Current Principal/Notional Amount		$ 2,038,000	[1],[3],[4]	$ 2,661,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Investments Fair Value		$ 371,000	[1],[3],[4]	$ 512,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Point Two Six Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-06	[1],[3],[4]	2040-06	[5],[7],[8]
Current Principal/Notional Amount		$ 74,967,000	[1],[3],[4]	$ 81,664,000	[5],[7],[8]
Rate		0.26%	[1],[3],[4]	0.26%	[5],[7],[8]
Investments Fair Value		$ 352,000	[1],[3],[4]	$ 472,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Four Point Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2043-07
Current Principal/Notional Amount	[1],[3],[4]	$ 1,699,000
Rate	[1],[3],[4]	4.50%
Investments Fair Value	[1],[3],[4]	$ 256,000
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Three Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-09	[1],[3],[4]	2041-09	[5],[7],[8]
Current Principal/Notional Amount		$ 2,677,000	[1],[3],[4]	$ 3,167,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Investments Fair Value		$ 247,000	[1],[3],[4]	$ 321,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Four Point Seven Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-07	[1],[3],[4]	2040-07	[5],[7],[8]
Current Principal/Notional Amount		$ 1,000,000	[1],[3],[4]	$ 1,396,000	[5],[7],[8]
Rate		4.75%	[1],[3],[4]	4.75%	[5],[7],[8]
Investments Fair Value		$ 178,000	[1],[3],[4]	$ 253,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Five Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-05	[1],[3],[4]	2037-05	[5],[7],[8]
Current Principal/Notional Amount		$ 1,168,000	[1],[3],[4]	$ 2,289,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Investments Fair Value		$ 47,000	[1],[3],[4]	$ 151,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		19.92%	[1],[2],[3],[4]	10.94%	[5],[6],[7],[8]
Current Principal/Notional Amount		$ 118,806,000		$ 67,720,000
Investments Fair Value		$ 123,680,000	[1],[3],[4]	$ 70,525,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Government National Mortgage Association (30 Year) 4 Point 00 Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2018-01	[1],[3],[4]	2017-01	[5],[7],[8]
Current Principal/Notional Amount		$ 42,884,000	[1],[3],[4]	$ 24,540,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Investments Fair Value		$ 44,738,000	[1],[3],[4]	$ 26,047,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Government National Mortgage Association (30 Year) 4 Point 50 Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2018-01
Current Principal/Notional Amount	[1],[3],[4]	$ 35,719,000
Rate	[1],[3],[4]	4.50%
Investments Fair Value	[1],[3],[4]	$ 37,504,000
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3 Point 50 Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2018-01	[1],[3],[4]	2017-01	[5],[7],[8]
Current Principal/Notional Amount		$ 27,340,000	[1],[3],[4]	$ 28,560,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Investments Fair Value		$ 28,085,000	[1],[3],[4]	$ 29,247,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (30 Year) 4.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2018-01
Current Principal/Notional Amount	[1],[3],[4]	$ 9,403,000
Rate	[1],[3],[4]	4.00%
Investments Fair Value	[1],[3],[4]	$ 9,835,000
TBA - Fixed Rate Agency Securities [Member] | Government National Mortgage Association (30 Year) 3.00% [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2018-01
Current Principal/Notional Amount	[1],[3],[4]	$ 2,100,000
Rate	[1],[3],[4]	3.00%
Investments Fair Value	[1],[3],[4]	$ 2,119,000
TBA - Fixed Rate Agency Securities [Member] | Government National Mortgage Association (30 Year) 3 Point 50 Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2018-01
Current Principal/Notional Amount	[1],[3],[4]	$ 890,000
Rate	[1],[3],[4]	3.50%
Investments Fair Value	[1],[3],[4]	$ 920,000
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3 Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2018-01
Current Principal/Notional Amount	[1],[3],[4]	$ 470,000
Rate	[1],[3],[4]	3.00%
Investments Fair Value	[1],[3],[4]	$ 479,000
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (15 Year) 3 Point 50 Percent [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2017-01
Current Principal/Notional Amount	[5],[7],[8]			$ 14,620,000
Rate	[5],[7],[8]			3.50%
Investments Fair Value	[5],[7],[8]			$ 15,231,000
Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		145.75%	[1],[2],[3],[4]	134.44%	[5],[6],[7],[8]
Investments Fair Value		$ 905,025,000	[1],[3],[4]	$ 866,846,000	[5],[7],[8]
Investment Owned, at Cost		$ 911,909,000	[1],[3],[4]	$ 869,071,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		11.10%	[1],[2],[3],[4]	2.12%	[5],[6],[7],[8]
Investments Fair Value		$ 68,933,000	[1],[3],[4]	$ 13,688,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Government National Mortgage Association Pools [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Current Principal/Notional Amount		56,137,000	[1],[3],[4]	$ 2,097,000	[5],[7],[8]
Rate	[5],[7],[8]			2.89%
Investments Fair Value		$ 60,866,000	[1],[3],[4]	$ 2,231,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Government National Mortgage Association Pools [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2061-07
Rate	[1],[3],[4]	3.59%
Principal And Interest - Floating Rate Agency Securities [Member] | Government National Mortgage Association Pools [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2067-10
Rate	[1],[3],[4]	4.68%
Principal And Interest - Floating Rate Agency Securities [Member] | Federal National Mortgage Association Pools [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 4,806,000	[1],[3],[4]	5,876,000	[5],[7],[8]
Investments Fair Value		$ 4,999,000	[1],[3],[4]	$ 6,129,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal National Mortgage Association Pools [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2035-09	[1],[3],[4]	2035-09	[5],[7],[8]
Rate		2.79%	[1],[3],[4]	2.55%	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal National Mortgage Association Pools [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-05	[1],[3],[4]	2045-05	[5],[7],[8]
Rate		3.69%	[1],[3],[4]	5.94%	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 2,963,000	[1],[3],[4]	$ 5,122,000	[5],[7],[8]
Investments Fair Value		$ 3,068,000	[1],[3],[4]	$ 5,328,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-06	[1],[3],[4]	2037-06	[5],[7],[8]
Rate		3.49%	[1],[3],[4]	3.12%	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-05	[1],[3],[4]	2044-05	[5],[7],[8]
Rate		4.80%	[1],[3],[4]	5.97%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		3.47%	[1],[2],[3],[4]	2.71%	[5],[6],[7],[8]
Investments Fair Value		$ 21,556,000	[1],[3],[4]	$ 17,433,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		313,840,000	[1],[3],[4]	228,955,000	[5],[7],[8]
Investments Fair Value		$ 16,248,000	[1],[3],[4]	$ 13,831,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-03	[1],[3],[4]	2037-05	[5],[7],[8]
Rate		0.41%	[1],[3],[4]	0.40%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2066-10	[1],[3],[4]	2064-11	[5],[7],[8]
Rate		5.31%	[1],[3],[4]	6.09%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 30,729,000	[1],[3],[4]	$ 12,928,000	[5],[7],[8]
Investments Fair Value		$ 3,506,000	[1],[3],[4]	$ 1,867,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2033-06	[1],[3],[4]	2033-06	[5],[7],[8]
Rate		4.30%	[1],[3],[4]	5.39%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-12	[1],[3],[4]	2041-12	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.79%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 11,211,000	[1],[3],[4]	$ 5,182,000	[5],[7],[8]
Investments Fair Value		$ 1,436,000	[1],[3],[4]	$ 865,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2036-03	[1],[3],[4]	2036-03	[5],[7],[8]
Rate		4.52%	[1],[3],[4]	5.30%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-04	[1],[3],[4]	2039-08	[5],[7],[8]
Rate		5.15%	[1],[3],[4]	5.93%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Resecuritization of Government National Mortgage Association [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2060-08	[1],[3],[4],[9]	2060-08	[5],[7],[8],[10]
Current Principal/Notional Amount		$ 10,619,000	[1],[3],[4],[9]	$ 15,902,000	[5],[7],[8],[10]
Rate		3.25%	[1],[3],[4],[9]	3.95%	[5],[7],[8],[10]
Investments Fair Value		$ 366,000	[1],[3],[4],[9]	$ 870,000	[5],[7],[8],[10]
Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		14.57%	[1],[2],[3],[4]	4.83%	[5],[6],[7],[8]
Investments Fair Value		$ 90,489,000	[1],[3],[4]	$ 31,121,000	[5],[7],[8]
Investment Owned, at Cost		$ 91,413,000	[1],[3],[4]	$ 31,069,000	[5],[7],[8]
Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		160.32%	[1],[2],[3],[4]	139.27%	[5],[6],[7],[8]
Investments Fair Value		$ 995,514,000	[1],[3],[4]	$ 897,967,000	[5],[7],[8]
Investment Owned, at Cost		$ 1,003,322,000	[1],[3],[4]	$ 900,140,000	[5],[7],[8]
Principal And Interest - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		47.12%	[2],[3],[4]	28.17%	[6],[7],[8]
Investments Fair Value		$ 292,566,000	[3],[4]	$ 181,649,000	[7],[8]
Investment Owned, at Cost		$ 278,803,000	[3],[4]	$ 184,417,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		29.16%	[2],[3],[4]	20.48%	[6],[7],[8]
Investments Fair Value		$ 181,042,000	[3],[4]	$ 132,071,000	[7],[8]
Investment Owned, at Cost		$ 172,285,000	[3],[4]	$ 125,106,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		17.96%	[2],[3],[4]	7.69%	[6],[7],[8]
Investments Fair Value		$ 111,524,000	[3],[4]	$ 49,578,000	[7],[8]
Investment Owned, at Cost		106,518,000	[3],[4]	59,311,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		80,114,000	[3],[4]	119,636,000	[7],[8]
Investments Fair Value		26,155,000	[3],[4]	30,334,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		232,771,000	[3],[4]	233,890,000	[7],[8]
Investments Fair Value		154,887,000	[3],[4]	101,737,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Europe [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		23,752,000	[3],[4]	9,361,000	[7],[8]
Investments Fair Value		11,601,000	[3],[4]	8,680,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Europe [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		127,469,000	[3],[4]	63,244,000	[7],[8]
Investments Fair Value		$ 99,923,000	[3],[4]	$ 40,898,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2035-08	[3],[4]	2045-07	[7],[8]
Rate		2.05%	[3],[4]	2.31%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-05	[3],[4]	2019-05	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Europe [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2020-10	[3],[4]	2017-06	[7],[8]
Rate		0.37%	[3],[4]	0.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Europe [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2025-06	[3],[4]	2025-06	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2058-09	[3],[4]	2049-12	[7],[8]
Rate		4.41%	[3],[4]	4.41%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-09	[3],[4]	2046-09	[7],[8]
Rate		30.29%	[3],[4]	9.35%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-02	[3],[4]	2039-02	[7],[8]
Rate		5.03%	[3],[4]	11.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2061-01	[3],[4]	2040-03	[7],[8]
Rate		5.50%	[3],[4]	5.15%	[7],[8]
Interest Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		1.26%	[2],[3],[4]	0.81%	[6],[7],[8]
Investments Fair Value		$ 7,845,000	[3],[4]	$ 5,227,000	[7],[8]
Investment Owned, at Cost		5,334,000	[3],[4]	4,963,000	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		39,871,000	[3],[4]	72,535,000	[7],[8]
Investments Fair Value		2,989,000	[3],[4]	4,254,000	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		36,008,000	[3],[4]	36,498,000	[7],[8]
Investments Fair Value		$ 4,856,000	[3],[4]	$ 973,000	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2049-03	[3],[4]	2047-10	[7],[8]
Rate		1.25%	[3],[4]	1.25%	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-12	[3],[4]	2044-06	[7],[8]
Rate		0.00%	[3],[4]	0.50%	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2049-12	[3],[4]	2049-12	[7],[8]
Rate		2.00%	[3],[4]	2.71%	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-09	[3],[4]	2047-09	[7],[8]
Rate		2.00%	[3],[4]	2.00%	[7],[8]
Other Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.00%	[2],[3],[4]	0.00%	[6],[7],[8]
Investments Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Investment Owned, at Cost		215,000	[3],[4]	245,000	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 0	[3],[4]	$ 0	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Investments Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-06	[3],[4]	2037-06	[7],[8]
Current Principal/Notional Amount		$ 79,487,000	[3],[4]	$ 90,639,000	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Investments Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-07	[3],[4]	2045-07	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2049-12	[3],[4]	2049-12	[7],[8]
Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		48.38%	[2],[3],[4]	28.98%	[6],[7],[8]
Investments Fair Value		$ 300,411,000	[3],[4]	$ 186,876,000	[7],[8]
Investment Owned, at Cost		$ 284,352,000	[3],[4]	$ 189,625,000	[7],[8]
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		208.70%	[2],[3],[4]	168.25%	[6],[7],[8]
Investments Fair Value		$ 1,295,925,000	[3],[4]	$ 1,084,843,000	[7],[8]
Investment Owned, at Cost		$ 1,287,674,000	[3],[4]	$ 1,089,765,000	[7],[8]
Collateralized Loan Obligations [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		33.95%	[2],[3],[4]	6.97%	[6],[7],[8]
Investments Fair Value		$ 210,816,000	[3],[4]	$ 44,956,000	[7],[8]
Investment Owned, at Cost		$ 212,998,000	[3],[4]	$ 49,087,000	[7],[8]
Collateralized Loan Obligations [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		27.40%	[2],[3],[4],[11]	3.49%	[6],[7],[8]
Investments Fair Value		$ 170,123,000	[3],[4],[11]	$ 22,519,000	[7],[8]
Investment Owned, at Cost		$ 174,635,000	[3],[4],[11]	$ 25,860,000	[7],[8]
Collateralized Loan Obligations [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		6.55%	[2],[3],[4]	3.48%	[6],[7],[8]
Investments Fair Value		$ 40,693,000	[3],[4]	$ 22,437,000	[7],[8]
Investment Owned, at Cost		38,363,000	[3],[4]	23,227,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		278,601,000	[3],[4],[11]	69,917,000	[7],[8]
Investments Fair Value		170,123,000	[3],[4],[11]	22,519,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		42,101,000	[3],[4]	28,053,000	[7],[8]
Investments Fair Value		$ 40,693,000	[3],[4]	$ 22,437,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2018-01	[3],[4],[11]	2017-11	[7],[8]
Rate		0.00%	[3],[4],[11]	0.00%	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Minimum [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2022-04	[3],[4]	2022-01	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2057-11	[3],[4],[11]	2024-06	[7],[8]
Rate		10.04%	[3],[4],[11]	7.88%	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2027-01	[3],[4]	2025-03	[7],[8]
Rate		7.95%	[3],[4]	3.84%	[7],[8]
Consumer loans and asset-backed securities backed by consumer loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		21.78%	[2],[3],[4],[12]	16.62%	[6],[7],[8],[13],[14]
Investments Fair Value		$ 135,258,000	[3],[4],[12]	$ 107,157,000	[7],[8],[13],[14]
Investment Owned, at Cost		$ 139,387,000	[3],[4],[12]	$ 111,115,000	[7],[8],[13],[14]
Consumer loans and asset-backed securities backed by consumer loans [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		21.34%	[2],[3],[4],[12]	16.15%	[6],[7],[8],[13],[14]
Investments Fair Value		$ 132,509,000	[3],[4],[12]	$ 104,108,000	[7],[8],[13],[14]
Investment Owned, at Cost		$ 138,312,000	[3],[4],[12]	$ 108,982,000	[7],[8],[13],[14]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.44%	[2],[3],[4],[12]	0.47%	[6],[7],[8],[13],[14]
Investments Fair Value		$ 2,749,000	[3],[4],[12]	$ 3,049,000	[7],[8],[13],[14]
Investment Owned, at Cost		1,075,000	[3],[4],[12]	2,133,000	[7],[8],[13],[14]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		151,753,000	[3],[4],[12],[15],[16]	103,026,000	[7],[8],[13],[14],[17],[18],[19]
Investments Fair Value		132,509,000	[3],[4],[12],[15],[16]	104,108,000	[7],[8],[13],[14],[17],[18],[19]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Europe [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 3,711,000	[3],[4],[12]	$ 3,449,000	[7],[8],[13],[14]
Rate		0.00%	[3],[4],[12]	0.00%	[7],[8],[13],[14]
Investments Fair Value		$ 2,749,000	[3],[4],[12]	$ 3,049,000	[7],[8],[13],[14]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date		2018-01	[3],[4],[12],[15],[16]	2017-01	[7],[8],[13],[14],[17],[18],[19]
Rate		5.31%	[3],[4],[12],[15],[16]	5.31%	[7],[8],[13],[14],[17],[18],[19]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Minimum [Member] | Europe [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date		2024-08	[3],[4],[12]	2024-08	[7],[8],[13],[14]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date		2022-09	[3],[4],[12],[15],[16]	2021-12	[7],[8],[13],[14],[17],[18],[19]
Rate		76.28%	[3],[4],[12],[15],[16]	60.28%	[7],[8],[13],[14],[17],[18],[19]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-12	[3],[4],[12]	2026-03	[7],[8],[13],[14]
Corporate Debt [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		12.11%	[2],[3],[4]	12.42%	[6],[7],[8]
Investments Fair Value		$ 75,193,000	[3],[4]	$ 80,095,000	[7],[8]
Investment Owned, at Cost		$ 75,952,000	[3],[4]	$ 81,036,000	[7],[8]
Corporate Debt [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		9.76%	[2],[3],[4]	12.13%	[6],[7],[8]
Investments Fair Value		$ 60,618,000	[3],[4]	$ 78,187,000	[7],[8]
Investment Owned, at Cost		$ 60,640,000	[3],[4]	$ 78,482,000	[7],[8]
Corporate Debt [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		2.35%	[2],[3],[4]	0.29%	[6],[7],[8]
Investments Fair Value		$ 14,575,000	[3],[4]	$ 1,908,000	[7],[8]
Investment Owned, at Cost		15,312,000	[3],[4]	2,554,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Basic Materials [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[3],[4]	6,025,000
Investments Fair Value	[3],[4]	6,254,000
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Communications [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		8,490,000	[3],[4]	9,381,000	[7],[8]
Investments Fair Value		8,523,000	[3],[4]	9,489,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		21,993,000	[3],[4]	22,991,000	[7],[8]
Investments Fair Value		23,043,000	[3],[4]	24,187,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Energy [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		9,665,000	[3],[4]	16,170,000	[7],[8]
Investments Fair Value		$ 10,266,000	[3],[4]	16,951,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Financial [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2024-09
Current Principal/Notional Amount	[3],[4]	$ 560,000
Rate	[3],[4]	5.13%
Investments Fair Value	[3],[4]	$ 606,000
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Industrial Sector [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2021-12
Current Principal/Notional Amount		$ 2,250,000	[3],[4]	12,470,000	[7],[8]
Rate	[3],[4]	3.75%
Investments Fair Value		$ 2,286,000	[3],[4]	$ 12,709,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-10	[3],[4],[20]	2019-10	[7],[8]
Current Principal/Notional Amount		$ 5,429,000	[3],[4],[20]	$ 10,500,000	[7],[8]
Rate		15.00%	[3],[4],[20]	15.00%	[7],[8]
Investments Fair Value		$ 5,429,000	[3],[4],[20]	$ 9,975,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Technology Sector [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		4,300,000	[3],[4]	3,827,000	[7],[8]
Investments Fair Value		$ 4,211,000	[3],[4]	$ 3,937,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | North America [Member] | Utilities [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2021-07
Current Principal/Notional Amount	[7],[8]			$ 840,000
Rate	[7],[8]			7.38%
Investments Fair Value	[7],[8]			$ 939,000
Corporate Debt [Member] | Various Issuer [Member] | Europe [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2018-03
Current Principal/Notional Amount		$ 20,070,000	[3],[4]	$ 17,618,000	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Investments Fair Value		$ 50,000	[3],[4]	$ 380,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Europe [Member] | Financial [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[3],[4]	13,725,000
Investments Fair Value	[3],[4]	$ 13,437,000
Corporate Debt [Member] | Various Issuer [Member] | Europe [Member] | Industrial Sector [Member]
Schedule of Investments [Line Items]
Investments maturity date		2021-03	[3],[4]	2021-03	[7],[8]
Current Principal/Notional Amount		$ 1,145,000	[3],[4]	$ 1,867,000	[7],[8]
Rate		1.59%	[3],[4]	6.50%	[7],[8]
Investments Fair Value		$ 1,088,000	[3],[4]	$ 1,528,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Basic Materials [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2025-08
Rate	[3],[4]	6.88%
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Communications [Member]
Schedule of Investments [Line Items]
Investments maturity date		2020-04	[3],[4]	2018-04	[7],[8]
Rate		3.40%	[3],[4]	6.75%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-01	[3],[4]	2017-05	[7],[8]
Rate		2.60%	[3],[4]	3.85%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Energy [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-03	[3],[4]	2019-03	[7],[8]
Rate		4.50%	[3],[4]	6.38%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Industrial Sector [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2019-05
Rate	[7],[8]			3.75%
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Technology Sector [Member]
Schedule of Investments [Line Items]
Investments maturity date		2021-10	[3],[4]	2020-03	[7],[8]
Rate		3.63%	[3],[4]	6.13%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Europe [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2017-12
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Europe [Member] | Financial [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2020-10
Rate	[3],[4]	0.00%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Basic Materials [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2027-03
Rate	[3],[4]	7.00%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Communications [Member]
Schedule of Investments [Line Items]
Investments maturity date		2027-08	[3],[4]	2022-12	[7],[8]
Rate		11.57%	[3],[4]	9.07%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date		2034-12	[3],[4]	2025-05	[7],[8]
Rate		9.73%	[3],[4]	11.00%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Energy [Member]
Schedule of Investments [Line Items]
Investments maturity date		2025-08	[3],[4]	2023-02	[7],[8]
Rate		9.63%	[3],[4]	9.63%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Industrial Sector [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2022-12
Rate	[7],[8]			7.75%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Technology Sector [Member]
Schedule of Investments [Line Items]
Investments maturity date		2022-08	[3],[4]	2022-08	[7],[8]
Rate		7.50%	[3],[4]	7.50%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2018-12
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member] | Financial [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2022-11
Rate	[3],[4]	15.67%
Mortgage Loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		46.83%	[2],[3],[4],[12]	22.55%	[6],[7],[8],[14]
Investments Fair Value		$ 290,773,000	[3],[4],[12]	$ 145,419,000	[7],[8],[14]
Investment Owned, at Cost		288,034,000	[3],[4],[12]	148,173,000	[7],[8],[14]
Mortgage Loans [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		116,707,000	[3],[4],[12],[21]	71,020,000	[7],[8],[14],[22]
Investments Fair Value		108,301,000	[3],[4],[12],[21]	61,129,000	[7],[8],[14],[22]
Mortgage Loans [Member] | Various Issuer [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		181,553,000	[3],[4],[12],[23],[24]	89,658,000	[7],[8],[14],[25]
Investments Fair Value		$ 182,472,000	[3],[4],[12],[23],[24]	$ 84,290,000	[7],[8],[14],[25]
Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2018-02	[3],[4],[12],[21]	2017-06	[7],[8],[14],[22]
Rate		3.14%	[3],[4],[12],[21]	2.73%	[7],[8],[14],[22]
Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2022-04	[3],[4],[12],[23],[24]	2022-04	[7],[8],[14],[25]
Rate		2.00%	[3],[4],[12],[23],[24]	2.00%	[7],[8],[14],[25]
Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-10	[3],[4],[12],[21]	2037-10	[7],[8],[14],[22]
Rate		12.87%	[3],[4],[12],[21]	12.12%	[7],[8],[14],[22]
Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments maturity date		2057-04	[3],[4],[12],[23],[24]	2057-07	[7],[8],[14],[25]
Rate		12.63%	[3],[4],[12],[23],[24]	12.63%	[7],[8],[14],[25]
Real Estate Owned [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		4.23%	[2],[3],[4],[12],[26]	0.52%	[6],[7],[8],[14],[27]
Investments Fair Value		$ 26,277,000	[3],[4],[12],[26]	$ 3,349,000	[7],[8],[14],[27]
Investment Owned, at Cost		26,146,000	[3],[4],[12],[26]	3,539,000	[7],[8],[14],[27]
Real Estate Owned [Member] | Single-Family Houses [Member] | North America [Member] | Real estate-related [Member]
Schedule of Investments [Line Items]
Investments Fair Value		$ 591,000	[3],[4],[12],[26]	$ 1,699,000	[7],[8],[14],[27]
Number of Real Estate Properties		3	[3],[4],[12],[26]	9	[7],[8],[14],[27]
Real Estate Owned [Member] | Commercial Property [Member] | North America [Member] | Real estate-related [Member]
Schedule of Investments [Line Items]
Investments Fair Value		$ 25,686,000	[3],[4],[12],[26]	$ 1,650,000	[7],[8],[14],[27]
Number of Real Estate Properties		9	[3],[4],[12],[26]	1	[7],[8],[14],[27]
Corporate Equity Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		6.03%	[2],[3],[4]	5.25%	[6],[7],[8],[13]
Investments Fair Value		$ 37,465,000	[3],[4]	$ 33,788,000	[7],[8],[13]
Investment Owned, at Cost		$ 41,563,000	[3],[4]	$ 37,360,000	[7],[8],[13]
Corporate Equity Investments [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		6.03%	[2],[3],[4]	5.25%	[6],[7],[8],[13]
Investments Fair Value		$ 37,461,000	[3],[4]	$ 33,788,000	[7],[8],[13]
Investment Owned, at Cost		$ 41,559,000	[3],[4]	$ 37,360,000	[7],[8],[13]
Corporate Equity Investments [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.00%	[2],[3],[4]	0.00%	[6],[7],[8],[13]
Investments Fair Value		$ 4,000	[3],[4]	$ 0	[7],[8],[13]
Investment Owned, at Cost		4,000	[3],[4]	0	[7],[8],[13]
Corporate Equity Investments [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | North America [Member] | Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Investments Fair Value	[3],[4],[28]	5,033,000
Corporate Equity Investments [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments Fair Value		5,693,000	[3],[4],[28]	7,315,000	[7],[8],[13],[19]
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | North America [Member] | Communications [Member]
Schedule of Investments [Line Items]
Investments Fair Value	[3],[4]	$ 557,000
Investment Owned, Balance, Shares	[3],[4]	7
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | North America [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments Fair Value		$ 5,000	[3],[4]	$ 825,000	[7],[8],[13]
Investment Owned, Balance, Shares		1,540	[3],[4]	1,557	[7],[8],[13]
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | North America [Member] | Diversified [Member]
Schedule of Investments [Line Items]
Investments Fair Value		$ 2,585,000	[3],[4]	$ 3,162,000	[7],[8],[13]
Investment Owned, Balance, Shares		156	[3],[4]	191	[7],[8],[13]
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Europe [Member] | Consumer [Member]
Schedule of Investments [Line Items]
Investments Fair Value		$ 0	[3],[4]	$ 0	[7],[8],[13]
Investment Owned, Balance, Shares		125	[3],[4]	125	[7],[8],[13]
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Europe [Member] | Financial [Member]
Schedule of Investments [Line Items]
Investments Fair Value	[3],[4]	$ 4,000
Investment Owned, Balance, Shares	[3],[4]	0
Corporate Equity Investments [Member] | Exchange Traded Equity [Member] | North America [Member] | Financial [Member]
Schedule of Investments [Line Items]
Investments Fair Value	[7],[8],[13]			$ 4,396,000
Investment Owned, Balance, Shares	[7],[8],[13]			51
Corporate Equity Investments [Member] | Non-controlling Interest in Mortgage-related Private Partnership [Member] | North America [Member] | Mortgage-related Commercial [Member]
Schedule of Investments [Line Items]
Investments Fair Value	[7],[8],[13]			$ 3,090,000
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage Originators [Member] | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments Fair Value		$ 20,774,000	[3],[4],[20]	$ 14,325,000	[7],[8],[13],[29]
Investment Owned, Balance, Shares		20	[3],[4],[20]	1,838	[7],[8],[13],[29]
Corporate Equity Investments [Member] | Non-Exchange Traded Equity Investment in Mortgage Originator | North America [Member] | Mortgage-related Residential [Member]
Schedule of Investments [Line Items]
Investments Fair Value		$ 2,814,000	[3],[4],[20]	$ 675,000	[7],[8],[13],[29]
Investment Owned, Balance, Shares		9,818	[3],[4],[20]	6,750	[7],[8],[13],[29]
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	[6],[7],[8]			0.84%
Investments Fair Value	[7],[8]			$ 5,419,000
Investment Owned, at Cost	[7],[8]			5,635,000
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | North America [Member] | Government [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[7],[8]			5,620,000
Investments Fair Value	[7],[8]			$ 5,419,000
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Minimum [Member] | North America [Member] | Government [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2021-05
Rate	[7],[8]			1.13%
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Maximum [Member] | North America [Member] | Government [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2026-05
Rate	[7],[8]			1.63%
Long Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		333.63%	[2],[3],[4]	233.42%	[6],[7],[8]
Investments Fair Value		$ 2,071,707,000	[3],[4]	$ 1,505,026,000	[7],[8]
Investment Owned, at Cost		$ 2,071,754,000	[3],[4]	$ 1,525,710,000	[7],[8]
Long Investments [Member] | Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		45.07%		23.36%
Long Investments [Member] | Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		72.39%		73.78%
Long Investments [Member] | Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		42.86%		42.13%
[1]	At December 31, 2017, the Company's long investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 72.39%, 42.86%, and 45.07% of Total Equity, respectively.
[2]	Classification percentages are based on Total Equity.
[3]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[4]	The table below shows the ratings on the Company's long investments from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 160.32%A/A/A 0.81%Baa/BBB/BBB 2.62%Ba/BB/BB or below 68.03%Unrated 101.85%
[5]	At December 31, 2016, the Company's long investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 73.78%, 42.13%, and 23.36% of Total Equity, respectively.
[6]	Classification percentages are based on Total Equity.
[7]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[8]	The table below shows the Company's long investment ratings from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 139.27%Aaa/AAA/AAA 0.84%Aa/AA/AA 0.03%A/A/A 0.05%Baa/BBB/BBB 2.60%Ba/BB/BB or below 30.24%Unrated 60.39%
[9]	Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.
[10]	Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.
[11]	Includes investment in collateralized loan obligation notes in the amount of $37.7 million that were issued and are managed by related parties of the Company. See Note 9 to the Notes to Consolidated Financial Statements.
[12]	Loans and real estate owned are beneficially owned by the Company through participation certificates in the various trusts that hold such investments. See Note 9 to the Notes to Consolidated Financial Statements.
[13]	Conformed to current period presentation.
[14]	Loans and real estate owned are beneficially owned by the Company through participation certificates in the various trusts that hold such investments. See Note 9 to the Notes to Consolidated Financial Statements.
[15]	Includes investments in participation certificates related to loans held in a trust owned by a related party of Ellington Management Group, L.L.C. Through its participation certificates, the Company participates in the cash flows of the underlying loans held by the trust. At December 31, 2017 loans held in the related party trust for which the Company has participating interests in the cash flows, totaled $114.5 million. See Note 9 to the Notes to Consolidated Financial Statements.
[16]	Includes investments in participation certificates related to loans titled in the name of a related party of Ellington Financial Management LLC. Through its participation certificates, the Company has beneficial interests in the loan cash flows, net of servicing-related fees and expenses. At December 31, 2017 loans for which the Company has beneficial interests in the net cash flows, totaled $11.7 million. See Note 9 to the Notes to Consolidated Financial Statements.
[17]	Includes investments in participation certificates related to loans held in a trust owned by a related party of Ellington Management Group, L.L.C. Through its participation certificates, the Company participates in the cash flows of the underlying loans held by the trust. At December 31, 2016 loans held in the related party trust for which the Company has participating interests in the cash flows, totaled $43.2 million. See Note 9 to the Notes to Consolidated Financial Statements.
[18]	Includes investments in participation certificates related to loans titled in the name of a related party of Ellington Management Group L.L.C. Through its participation certificates, the Company has beneficial interests in the loan cash flows, net of servicing-related fees and expenses. At December 31, 2016 loans for which the Company has beneficial interests in the net cash flows, totaled $7.6 million. See Note 9 to the Notes to Consolidated Financial Statements.
[19]	Includes the Company's beneficial interest in an entity, which is co-owned by an affiliate of Ellington Management Group, L.L.C., in the amount of $7.3 million as of December 31, 2016. The entity owns subordinated notes issued by, as well as trust certificates representing ownership of, a securitization trust. See Note 9 to the Notes to Consolidated Financial Statements.
[20]	Represents the Company's investment in a related party. See Note 9 to the Notes to Consolidated Financial Statements.
[21]	Includes non-performing commercial loans in the amount of $23.9 million whereby principal and/or interest is past due and a maturity date is not applicable.
[22]	Includes non-performing commercial loans in the amount of $28.6 million whereby principal and/or interest is past due and a maturity date is not applicable.
[23]	As of December 31, 2017, the Company had residential mortgage loans that were in the process of foreclosure with a fair value of $5.2 million.
[24]	Includes $132.4 million of non-qualified mortgage loans that have been securitized and are held in a consolidated securitization trust. See Note 6 to the Notes to Consolidated Financial Statements.
[25]	As of December 31, 2016, the Company had residential mortgage loans that were in the process of foreclosure with a fair value of $3.2 million.
[26]	Number of properties not shown in thousands, represents actual number of properties owned.
[27]	Number of properties not shown in thousands, represents actual number of properties owned.
[28]	Represents the Company's beneficial interest in an entity, which is co-owned by an affiliate of Ellington Management Group, L.L.C. The entity owns subordinated notes issued by, as well as trust certificates representing ownership of, a securitization trust. See Note 6 and Note 9 to the Notes to Consolidated Financial Statements.
[29]	Represents the Company's investment in a related party. See Note 9 to the Notes to Consolidated Financial Statements.

Consolidated Condensed Schedul6

Consolidated Condensed Schedule Of Investments (Repurchase Agreements) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Schedule of Investments [Line Items]
Fair value repurchase agreements	[1]	$ 155,949		$ 184,819
Repurchase agreements, cost		155,109		185,205
Repurchase Agreements [Member]
Schedule of Investments [Line Items]
Fair value repurchase agreements		$ 155,949	[2],[3]	$ 184,819	[4],[5]
Investment owned as a percentage of equity		25.11%	[2],[3],[6]	28.66%	[4],[5],[7]
Repurchase agreements, cost		$ 155,109	[2],[3]	$ 185,205	[4],[5]
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $30,501 U.S. Treasury Note, Coupon 2.25%, Maturity Date 2027 02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	30,310
Securities collateralized by par value	[2],[3]	$ 30,501
Coupon rate on underlying collateral	[2],[3]	2.25%
Maturity date of securities	[2],[3]	2027-02
Rate	[2],[3]	1.45%
Fair value repurchase agreements	[2],[3]	$ 30,310
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $16,516 Sovereign Government Bond, Coupon 0.25%, Maturity Date 2018 04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 16,578
Securities collateralized by par value	[2],[3]	$ 16,516
Coupon rate on underlying collateral	[2],[3]	0.25%
Maturity date of securities	[2],[3]	2018-04
Rate	[2],[3]	(0.57%)
Fair value repurchase agreements	[2],[3]	$ 16,578
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $14,228 Sovereign Government Bond, Coupon 0.25%, Maturity Date 2020 11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 14,548
Securities collateralized by par value	[2],[3]	$ 14,228
Coupon rate on underlying collateral	[2],[3]	0.25%
Maturity date of securities	[2],[3]	2020-11
Rate	[2],[3]	(0.62%)
Fair value repurchase agreements	[2],[3]	$ 14,548
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $14,000 U.S. Treasury Note, Coupon 1.88%, Maturity Date 2020 12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 13,965
Securities collateralized by par value	[2],[3]	$ 14,000
Coupon rate on underlying collateral	[2],[3]	1.88%
Maturity date of securities	[2],[3]	2020-12
Rate	[2],[3]	1.00%
Fair value repurchase agreements	[2],[3]	$ 13,965
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $10,447 Sovereign Government Bond, Coupon 0.75%, Maturity Date 2021 07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 10,760
Securities collateralized by par value	[2],[3]	$ 10,447
Coupon rate on underlying collateral	[2],[3]	0.75%
Maturity date of securities	[2],[3]	2021-07
Rate	[2],[3]	(0.65%)
Fair value repurchase agreements	[2],[3]	$ 10,760
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $9,474 Sovereign Government Bond, Coupon 2.75%, Maturity Date 2019 04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 10,043
Securities collateralized by par value	[2],[3]	$ 9,474
Coupon rate on underlying collateral	[2],[3]	2.75%
Maturity date of securities	[2],[3]	2019-04
Rate	[2],[3]	(0.57%)
Fair value repurchase agreements	[2],[3]	$ 10,043
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $9,400 Sovereign Government Bond, Coupon 1.15%, Maturity Date 2020 07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 9,764
Securities collateralized by par value	[2],[3]	$ 9,400
Coupon rate on underlying collateral	[2],[3]	1.15%
Maturity date of securities	[2],[3]	2020-07
Rate	[2],[3]	(0.57%)
Fair value repurchase agreements	[2],[3]	$ 9,764
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $9,400 Sovereign Government Bond, Coupon 0.65%, Maturity Date 2020 11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 9,588
Securities collateralized by par value	[2],[3]	$ 9,400
Coupon rate on underlying collateral	[2],[3]	0.65%
Maturity date of securities	[2],[3]	2020-11
Rate	[2],[3]	(0.58%)
Fair value repurchase agreements	[2],[3]	$ 9,588
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $6,000 U.S. Treasury Note, Coupon 1.75%, Maturity Date 2022 05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 5,895
Securities collateralized by par value	[2],[3]	$ 6,000
Coupon rate on underlying collateral	[2],[3]	1.75%
Maturity date of securities	[2],[3]	2022-05
Rate	[2],[3]	1.45%
Fair value repurchase agreements	[2],[3]	$ 5,895
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | CILO 2016-LD1 Holdings LLC Collateralized by Par Value $9,512 Exchange-Traded Debt, Coupon 5.50 Percent, Maturity Date 2022 07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 5,707	[2],[3],[8]	6,166	[4],[5],[9]
Securities collateralized by par value		$ 9,512	[2],[3],[8]	$ 9,512	[4],[5],[9]
Coupon rate on underlying collateral		5.50%	[2],[3],[8]	5.50%	[4],[5],[9]
Maturity date of securities		2022-07	[2],[3],[8]	2022-07	[4],[5],[9]
Rate		3.34%	[2],[3],[8]	2.90%	[4],[5],[9]
Fair value repurchase agreements		$ 5,707	[2],[3],[8]	$ 6,166	[4],[5],[9]
Investments maturity date		2018-03	[2],[3],[8]	2017-02	[4],[5],[9]
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $4,720 Exchange-Traded Corporate Debt, Coupon 5.88%, Maturity Date 2020 10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 4,921
Securities collateralized by par value	[2],[3]	$ 4,720
Coupon rate on underlying collateral	[2],[3]	5.88%
Maturity date of securities	[2],[3]	2020-10
Rate	[2],[3]	(2.00%)
Fair value repurchase agreements	[2],[3]	$ 4,921
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $3,860 Exchange-Traded Corporate Debt, Coupon 10.50%, Maturity Date 2022 09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 3,122
Securities collateralized by par value	[2],[3]	$ 3,860
Coupon rate on underlying collateral	[2],[3]	10.50%
Maturity date of securities	[2],[3]	2022-09
Rate	[2],[3]	1.05%
Fair value repurchase agreements	[2],[3]	$ 3,122
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | CS First Boston Collateralized by Par Value $2,794 Exchange-Traded Corporate Debt, Coupon 8.00%, Maturity Date 2027 06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 2,790
Securities collateralized by par value	[2],[3]	$ 2,794
Coupon rate on underlying collateral	[2],[3]	8.00%
Maturity date of securities	[2],[3]	2027-06
Rate	[2],[3]	(1.00%)
Fair value repurchase agreements	[2],[3]	$ 2,790
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $2,223 U.S. Treasury Note, Coupon 2.25%, Maturity Date 2027 11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 2,192
Securities collateralized by par value	[2],[3]	$ 2,332
Coupon rate on underlying collateral	[2],[3]	2.25%
Maturity date of securities	[2],[3]	2027-11
Rate	[2],[3]	0.45%
Fair value repurchase agreements	[2],[3]	$ 2,192
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Societe Generale Collateralized by Par Value $2,560 Exchange-Traded Corporate Debt, Coupon 10.50%, Maturity Date 2022 09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 2,164
Securities collateralized by par value	[2],[3]	$ 2,560
Coupon rate on underlying collateral	[2],[3]	10.50%
Maturity date of securities	[2],[3]	2022-09
Rate	[2],[3]	1.10%
Fair value repurchase agreements	[2],[3]	$ 2,164
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $2,170 Exchange-Traded Corporate Debt, Coupon 4.88%, Maturity Date 2022 04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 2,151
Securities collateralized by par value	[2],[3]	$ 2,170
Coupon rate on underlying collateral	[2],[3]	4.88%
Maturity date of securities	[2],[3]	2022-04
Rate	[2],[3]	(2.75%)
Fair value repurchase agreements	[2],[3]	$ 2,151
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $1,850 Exchange-Traded Corporate Debt, Coupon 7.50%, Maturity Date 2024 04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 1,979
Securities collateralized by par value	[2],[3]	$ 1,850
Coupon rate on underlying collateral	[2],[3]	7.50%
Maturity date of securities	[2],[3]	2024-04
Rate	[2],[3]	(0.25%)
Fair value repurchase agreements	[2],[3]	$ 1,979
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $1,300 Exchange-Traded Corporate Debt, Coupon 8.25%, Maturity Date 2023 06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 1,320
Securities collateralized by par value	[2],[3]	$ 1,300
Coupon rate on underlying collateral	[2],[3]	8.25%
Maturity date of securities	[2],[3]	2023-06
Rate	[2],[3]	0.65%
Fair value repurchase agreements	[2],[3]	$ 1,320
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $1,285 Exchange-Traded Corporate Debt, Coupon 6.75%, Maturity Date 2023 06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 1,283
Securities collateralized by par value	[2],[3]	$ 1,285
Coupon rate on underlying collateral	[2],[3]	6.75%
Maturity date of securities	[2],[3]	2023-06
Rate	[2],[3]	(2.00%)
Fair value repurchase agreements	[2],[3]	$ 1,283
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $1,110 Exchange-Traded Corporate Debt, Coupon 6.75%, Maturity Date 2023 06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 1,079
Securities collateralized by par value	[2],[3]	$ 1,110
Coupon rate on underlying collateral	[2],[3]	6.75%
Maturity date of securities	[2],[3]	2023-06
Rate	[2],[3]	(2.25%)
Fair value repurchase agreements	[2],[3]	$ 1,079
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $970 Exchange-Traded Corporate Debt, Coupon 5.50%, Maturity Date 2024 10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 890
Securities collateralized by par value	[2],[3]	$ 970
Coupon rate on underlying collateral	[2],[3]	5.50%
Maturity date of securities	[2],[3]	2024-10
Rate	[2],[3]	(4.50%)
Fair value repurchase agreements	[2],[3]	$ 890
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $766 Exchange-Traded Corporate Debt, Coupon 6.25%, Maturity Date 2022 10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 737
Securities collateralized by par value	[2],[3]	$ 766
Coupon rate on underlying collateral	[2],[3]	6.25%
Maturity date of securities	[2],[3]	2022-10
Rate	[2],[3]	(5.75%)
Fair value repurchase agreements	[2],[3]	$ 737
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $591 Exchange-Traded Corporate Debt, Coupon 8.00%, Maturity Date 2022 12 [Member
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 655
Securities collateralized by par value	[2],[3]	$ 591
Coupon rate on underlying collateral	[2],[3]	8.00%
Maturity date of securities	[2],[3]	2022-12
Rate	[2],[3]	0.75%
Fair value repurchase agreements	[2],[3]	$ 655
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $615 U.S. Treasury Note, Coupon 2.00%, Maturity Date 2022 11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 613
Securities collateralized by par value	[2],[3]	$ 615
Coupon rate on underlying collateral	[2],[3]	2.00%
Maturity date of securities	[2],[3]	2022-11
Rate	[2],[3]	0.30%
Fair value repurchase agreements	[2],[3]	$ 613
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $581 Exchange-Traded Corporate Debt, Coupon 8.00%, Maturity Date 2027 06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 580
Securities collateralized by par value	[2],[3]	$ 581
Coupon rate on underlying collateral	[2],[3]	8.00%
Maturity date of securities	[2],[3]	2027-06
Rate	[2],[3]	(1.25%)
Fair value repurchase agreements	[2],[3]	$ 580
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $500 Exchange-Traded Corporate Debt, Coupon 5.75%, Maturity Date 2022 10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 523
Securities collateralized by par value	[2],[3]	$ 500
Coupon rate on underlying collateral	[2],[3]	5.75%
Maturity date of securities	[2],[3]	2022-10
Rate	[2],[3]	1.05%
Fair value repurchase agreements	[2],[3]	$ 523
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | CS First Boston Collateralized by Par Value $464 Exchange-Traded Corporate Debt, Coupon 6.25%, Maturity Date 2022 10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 447
Securities collateralized by par value	[2],[3]	$ 464
Coupon rate on underlying collateral	[2],[3]	6.25%
Maturity date of securities	[2],[3]	2022-10
Rate	[2],[3]	(5.00%)
Fair value repurchase agreements	[2],[3]	$ 447
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $400 Exchange-Traded Corporate Debt, Coupon 5.25%, Maturity Date 2022 03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 414
Securities collateralized by par value	[2],[3]	$ 400
Coupon rate on underlying collateral	[2],[3]	5.25%
Maturity date of securities	[2],[3]	2022-03
Rate	[2],[3]	0.95%
Fair value repurchase agreements	[2],[3]	$ 414
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | CS First Boston Collateralized by Par Value $310 Exchange-Traded Corporate Debt, Coupon 5.50%, Maturity Date 2024 10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 282
Securities collateralized by par value	[2],[3]	$ 310
Coupon rate on underlying collateral	[2],[3]	5.50%
Maturity date of securities	[2],[3]	2024-10
Rate	[2],[3]	(4.00%)
Fair value repurchase agreements	[2],[3]	$ 282
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $281 U.S. Treasury Bond, Coupon 2.25%, Maturity Date 2046 08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 255
Securities collateralized by par value	[2],[3]	$ 281
Coupon rate on underlying collateral	[2],[3]	2.25%
Maturity date of securities	[2],[3]	2046-08
Rate	[2],[3]	1.45%
Fair value repurchase agreements	[2],[3]	$ 255
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $250 Exchange-Traded Corporate Debt, Coupon 4.50%, Maturity Date 2022 04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 243
Securities collateralized by par value	[2],[3]	$ 250
Coupon rate on underlying collateral	[2],[3]	4.50%
Maturity date of securities	[2],[3]	2022-04
Rate	[2],[3]	(1.75%)
Fair value repurchase agreements	[2],[3]	$ 243
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $160 Exchange-Traded Corporate Debt, Coupon 2.88%, Maturity Date 2023 02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[2],[3]	$ 151
Securities collateralized by par value	[2],[3]	$ 160
Coupon rate on underlying collateral	[2],[3]	2.88%
Maturity date of securities	[2],[3]	2023-02
Rate	[2],[3]	0.50%
Fair value repurchase agreements	[2],[3]	$ 151
Investments maturity date	[2],[3]	2018-01
Repurchase Agreements [Member] | JP Morgan Securities Collateralized by Par Value $48,133 U.S. Treasury Note, Coupon 2.00 Percent, Maturity Date 2026 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 46,749
Securities collateralized by par value	[4],[5]			$ 48,133
Coupon rate on underlying collateral	[4],[5]			2.00%
Maturity date of securities	[4],[5]			2026-11
Rate	[4],[5]			(1.15%)
Fair value repurchase agreements	[4],[5]			$ 46,749
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $14,507 Sovereign Government Bond, Coupon 0.25 Percent, Maturity Date 2018 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 14,900
Securities collateralized by par value	[4],[5]			$ 14,507
Coupon rate on underlying collateral	[4],[5]			0.25%
Maturity date of securities	[4],[5]			2018-04
Rate	[4],[5]			(0.89%)
Fair value repurchase agreements	[4],[5]			$ 14,900
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $12,498 Sovereign Government Bond, Coupon 0.25 Percent, Maturity Date 2020 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 12,912
Securities collateralized by par value	[4],[5]			$ 12,498
Coupon rate on underlying collateral	[4],[5]			0.25%
Maturity date of securities	[4],[5]			2020-11
Rate	[4],[5]			(1.10%)
Fair value repurchase agreements	[4],[5]			$ 12,912
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $12,160 U.S. Treasury Note, Coupon 1.50 Percent, Maturity Date 2026 08
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 11,324
Securities collateralized by par value	[4],[5]			$ 12,160
Coupon rate on underlying collateral	[4],[5]			1.50%
Maturity date of securities	[4],[5]			2026-08
Rate	[4],[5]			(0.30%)
Fair value repurchase agreements	[4],[5]			$ 11,324
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $9,176 Sovereign Government Bond, Coupon 0.75 Percent, Maturity Date 2021 07
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 9,494
Securities collateralized by par value	[4],[5]			$ 9,176
Coupon rate on underlying collateral	[4],[5]			0.75%
Maturity date of securities	[4],[5]			2021-07
Rate	[4],[5]			(0.89%)
Fair value repurchase agreements	[4],[5]			$ 9,494
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $8,322 Sovereign Government Bond, Coupon 2.75 Percent, Maturity Date 2019 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 9,165
Securities collateralized by par value	[4],[5]			$ 8,322
Coupon rate on underlying collateral	[4],[5]			2.75%
Maturity date of securities	[4],[5]			2019-04
Rate	[4],[5]			(0.80%)
Fair value repurchase agreements	[4],[5]			$ 9,165
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $8,257 Sovereign Government Bond, Coupon 1.15 Percent, Maturity Date 2020 07
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 8,725
Securities collateralized by par value	[4],[5]			$ 8,257
Coupon rate on underlying collateral	[4],[5]			1.15%
Maturity date of securities	[4],[5]			2020-07
Rate	[4],[5]			(0.81%)
Fair value repurchase agreements	[4],[5]			$ 8,725
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $8,257 Sovereign Government Bond, Coupon 0.65 Percent, Maturity Date 2020 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 8,447
Securities collateralized by par value	[4],[5]			$ 8,257
Coupon rate on underlying collateral	[4],[5]			0.65%
Maturity date of securities	[4],[5]			2020-11
Rate	[4],[5]			(0.95%)
Fair value repurchase agreements	[4],[5]			$ 8,447
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Market LLC Collateralized by Par Value $6,300 Exchange-Traded Corporate Debt, Coupon 6.25 Percent, Maturity Date 2021 09
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 5,827
Securities collateralized by par value	[4],[5]			$ 6,300
Coupon rate on underlying collateral	[4],[5]			6.25%
Maturity date of securities	[4],[5]			2021-09
Rate	[4],[5]			(0.35%)
Fair value repurchase agreements	[4],[5]			$ 5,827
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $4,726 U.S. Treasury Note, Coupon 1.75 Percent, Maturity Date 2021 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 4,691
Securities collateralized by par value	[4],[5]			$ 4,726
Coupon rate on underlying collateral	[4],[5]			1.75%
Maturity date of securities	[4],[5]			2021-11
Rate	[4],[5]			(3.00%)
Fair value repurchase agreements	[4],[5]			$ 4,691
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $3,274 Exchange-Traded Corporate Debt, Coupon 6.25 Percent, Maturity Date 2022 07
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 3,274
Securities collateralized by par value	[4],[5]			$ 3,274
Coupon rate on underlying collateral	[4],[5]			6.25%
Maturity date of securities	[4],[5]			2022-07
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 3,274
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $3,100 Exchange-Traded Corporate Debt, Coupon 8.00 Percent, Maturity Date 2025 01
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 3,147
Securities collateralized by par value	[4],[5]			$ 3,100
Coupon rate on underlying collateral	[4],[5]			8.00%
Maturity date of securities	[4],[5]			2025-01
Rate	[4],[5]			(1.00%)
Fair value repurchase agreements	[4],[5]			$ 3,147
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $3,230 U.S. Treasury Note, Coupon 1.13 Percent, Maturity Date 2021 08
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 3,125
Securities collateralized by par value	[4],[5]			$ 3,230
Coupon rate on underlying collateral	[4],[5]			1.13%
Maturity date of securities	[4],[5]			2021-08
Rate	[4],[5]			0.10%
Fair value repurchase agreements	[4],[5]			$ 3,125
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $3,050 Exchange-Traded Corporate Debt, Coupon 4.00 Percent, Maturity Date 2021 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 3,006
Securities collateralized by par value	[4],[5]			$ 3,050
Coupon rate on underlying collateral	[4],[5]			4.00%
Maturity date of securities	[4],[5]			2021-11
Rate	[4],[5]			(0.50%)
Fair value repurchase agreements	[4],[5]			$ 3,006
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $3,032 Exchange-Traded Corporate Debt, Coupon 4.50 Percent, Maturity Date 2022 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 2,774
Securities collateralized by par value	[4],[5]			$ 3,032
Coupon rate on underlying collateral	[4],[5]			4.50%
Maturity date of securities	[4],[5]			2022-04
Rate	[4],[5]			(4.50%)
Fair value repurchase agreements	[4],[5]			$ 2,774
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Societe Generale Collateralized by Par Value $2,532 Exchange-Traded Corporate Debt, Coupon 4.00 Percent, Maturity Date 2021 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 2,534
Securities collateralized by par value	[4],[5]			$ 2,532
Coupon rate on underlying collateral	[4],[5]			4.00%
Maturity date of securities	[4],[5]			2021-11
Rate	[4],[5]			(0.50%)
Fair value repurchase agreements	[4],[5]			$ 2,534
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $2,090 Exchange-Traded Corporate Debt, Coupon 6.25 Percent, Maturity Date 2022 10
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 2,232
Securities collateralized by par value	[4],[5]			$ 2,090
Coupon rate on underlying collateral	[4],[5]			6.25%
Maturity date of securities	[4],[5]			2022-10
Rate	[4],[5]			(2.50%)
Fair value repurchase agreements	[4],[5]			$ 2,232
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $1,968 U.S. Treasury Note, Coupon 1.13 Percent, Maturity Date 2021 09
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,899
Securities collateralized by par value	[4],[5]			$ 1,968
Coupon rate on underlying collateral	[4],[5]			1.13%
Maturity date of securities	[4],[5]			2021-09
Rate	[4],[5]			0.10%
Fair value repurchase agreements	[4],[5]			$ 1,899
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $1,864 Exchange-Traded Corporate Debt, Coupon 4.88 Percent, Maturity Date 2022 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,777
Securities collateralized by par value	[4],[5]			$ 1,864
Coupon rate on underlying collateral	[4],[5]			4.88%
Maturity date of securities	[4],[5]			2022-04
Rate	[4],[5]			(2.25%)
Fair value repurchase agreements	[4],[5]			$ 1,777
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $1,550 Exchange-Traded Corporate Debt, Coupon 8.00 Percent, Maturity Date 2025 01
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,573
Securities collateralized by par value	[4],[5]			$ 1,550
Coupon rate on underlying collateral	[4],[5]			8.00%
Maturity date of securities	[4],[5]			2025-01
Rate	[4],[5]			(1.50%)
Fair value repurchase agreements	[4],[5]			$ 1,573
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $1,556 Exchange-Traded Corporate Debt, Coupon 4.88 Percent, Maturity Date 2022 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,503
Securities collateralized by par value	[4],[5]			$ 1,556
Coupon rate on underlying collateral	[4],[5]			4.88%
Maturity date of securities	[4],[5]			2022-04
Rate	[4],[5]			(2.50%)
Fair value repurchase agreements	[4],[5]			$ 1,503
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $1,560 Exchange-Traded Corporate Debt, Coupon 3.88 Percent, Maturity Date 2023 03
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,435
Securities collateralized by par value	[4],[5]			$ 1,560
Coupon rate on underlying collateral	[4],[5]			3.88%
Maturity date of securities	[4],[5]			2023-03
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 1,435
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Societe Generale Collateralized by Par Value $1,240 Exchange-Traded Corporate Debt, Coupon 9.25 Percent, Maturity Date 2021 07
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,369
Securities collateralized by par value	[4],[5]			$ 1,240
Coupon rate on underlying collateral	[4],[5]			9.25%
Maturity date of securities	[4],[5]			2021-07
Rate	[4],[5]			0.35%
Fair value repurchase agreements	[4],[5]			$ 1,369
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $1,305 U.S. Treasury Note, Coupon 1.38 Percent, Maturity Date 2021 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,281
Securities collateralized by par value	[4],[5]			$ 1,305
Coupon rate on underlying collateral	[4],[5]			1.38%
Maturity date of securities	[4],[5]			2021-04
Rate	[4],[5]			0.25%
Fair value repurchase agreements	[4],[5]			$ 1,281
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $1,190 Exchange-Traded Corporate Debt, Coupon 3.88 Percent, Maturity Date 2022 01
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,214
Securities collateralized by par value	[4],[5]			$ 1,190
Coupon rate on underlying collateral	[4],[5]			3.88%
Maturity date of securities	[4],[5]			2022-01
Rate	[4],[5]			0.25%
Fair value repurchase agreements	[4],[5]			$ 1,214
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $1,300 Exchange-Traded Corporate Debt, Coupon 5.50 Percent, Maturity Date 2024 10
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,147
Securities collateralized by par value	[4],[5]			$ 1,300
Coupon rate on underlying collateral	[4],[5]			5.50%
Maturity date of securities	[4],[5]			2024-10
Rate	[4],[5]			(1.75%)
Fair value repurchase agreements	[4],[5]			$ 1,147
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $1,130 Exchange-Traded Corporate Debt, Coupon 4.13 Percent, Maturity Date 2022 02
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 1,119
Securities collateralized by par value	[4],[5]			$ 1,130
Coupon rate on underlying collateral	[4],[5]			4.13%
Maturity date of securities	[4],[5]			2022-02
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 1,119
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $1,008 Exchange-Traded Corporate Debt, Coupon 4.00 Percent, Maturity Date 2021 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 975
Securities collateralized by par value	[4],[5]			$ 1,008
Coupon rate on underlying collateral	[4],[5]			4.00%
Maturity date of securities	[4],[5]			2021-11
Rate	[4],[5]			(0.65%)
Fair value repurchase agreements	[4],[5]			$ 975
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Societe Generale Collateralized by Par Value $850 Exchange-Traded Corporate Debt, Coupon 3.88 Percent, Maturity Date 2022 01
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 909
Securities collateralized by par value	[4],[5]			$ 850
Coupon rate on underlying collateral	[4],[5]			3.88%
Maturity date of securities	[4],[5]			2022-01
Rate	[4],[5]			0.35%
Fair value repurchase agreements	[4],[5]			$ 909
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $840 Exchange-Traded Corporate Debt, Coupon 4.00 Percent, Maturity Date 2021 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 817
Securities collateralized by par value	[4],[5]			$ 840
Coupon rate on underlying collateral	[4],[5]			4.00%
Maturity date of securities	[4],[5]			2021-11
Rate	[4],[5]			(0.50%)
Fair value repurchase agreements	[4],[5]			$ 817
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $780 Exchange-Traded Corporate Debt, Coupon 6.25 Percent, Maturity Date 2022 10
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 795
Securities collateralized by par value	[4],[5]			$ 780
Coupon rate on underlying collateral	[4],[5]			6.25%
Maturity date of securities	[4],[5]			2022-10
Rate	[4],[5]			(2.50%)
Fair value repurchase agreements	[4],[5]			$ 795
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $800 U.S. Treasury Note, Coupon 1.25 Percent, Maturity Date 2021 10
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 780
Securities collateralized by par value	[4],[5]			$ 800
Coupon rate on underlying collateral	[4],[5]			1.25%
Maturity date of securities	[4],[5]			2021-10
Rate	[4],[5]			(2.80%)
Fair value repurchase agreements	[4],[5]			$ 780
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $819 Exchange-Traded Corporate Debt, Coupon 4.50 Percent, Maturity Date 2022 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 760
Securities collateralized by par value	[4],[5]			$ 819
Coupon rate on underlying collateral	[4],[5]			4.50%
Maturity date of securities	[4],[5]			2022-04
Rate	[4],[5]			(4.75%)
Fair value repurchase agreements	[4],[5]			$ 760
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $650 Exchange-Traded Corporate Debt, Coupon 5.25 Percent, Maturity Date 2022 09
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 674
Securities collateralized by par value	[4],[5]			$ 650
Coupon rate on underlying collateral	[4],[5]			5.25%
Maturity date of securities	[4],[5]			2022-09
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 674
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $620 Exchange-Traded Corporate Debt, Coupon 6.38 Percent, Maturity Date 2026 04
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 673
Securities collateralized by par value	[4],[5]			$ 620
Coupon rate on underlying collateral	[4],[5]			6.38%
Maturity date of securities	[4],[5]			2026-04
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 673
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $620 Exchange-Traded Corporate Debt, Coupon 6.88 Percent, Maturity Date 2023 05
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 671
Securities collateralized by par value	[4],[5]			$ 620
Coupon rate on underlying collateral	[4],[5]			6.88%
Maturity date of securities	[4],[5]			2023-05
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 671
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities Collateralized by Par Value $620 Exchange-Traded Corporate Debt, Coupon 5.50 Percent, Maturity Date 2024 10
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 587
Securities collateralized by par value	[4],[5]			$ 620
Coupon rate on underlying collateral	[4],[5]			5.50%
Maturity date of securities	[4],[5]			2024-10
Rate	[4],[5]			(1.50%)
Fair value repurchase agreements	[4],[5]			$ 587
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $570 Exchange-Traded Corporate Debt, Coupon 4.00 Percent, Maturity Date 2021 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 566
Securities collateralized by par value	[4],[5]			$ 570
Coupon rate on underlying collateral	[4],[5]			4.00%
Maturity date of securities	[4],[5]			2021-11
Rate	[4],[5]			(0.35%)
Fair value repurchase agreements	[4],[5]			$ 566
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Barclays Capital Inc Collateralized by Par Value $550 Exchange-Traded Corporate Debt, Coupon 2.40 Percent, Maturity Date 2022 12
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 562
Securities collateralized by par value	[4],[5]			$ 550
Coupon rate on underlying collateral	[4],[5]			2.40%
Maturity date of securities	[4],[5]			2022-12
Rate	[4],[5]			(0.10%)
Fair value repurchase agreements	[4],[5]			$ 562
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $560 Exchange-Traded Corporate Debt, Coupon 4.00 Percent, Maturity Date 2021 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 545
Securities collateralized by par value	[4],[5]			$ 560
Coupon rate on underlying collateral	[4],[5]			4.00%
Maturity date of securities	[4],[5]			2021-11
Rate	[4],[5]			(0.38%)
Fair value repurchase agreements	[4],[5]			$ 545
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | JP Morgan Securities LLC Collateralized by Par Value $560 Exchange-Traded Corporate Debt, Coupon 6.25 Percent, Maturity Date 2021 09
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 543
Securities collateralized by par value	[4],[5]			$ 560
Coupon rate on underlying collateral	[4],[5]			6.25%
Maturity date of securities	[4],[5]			2021-09
Rate	[4],[5]			(0.35%)
Fair value repurchase agreements	[4],[5]			$ 543
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | Bank of America Securities Collateralized by Par Value $549 U.S. Treasury Note, Coupon 1.13 Percent, Maturity Date 2021 07
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 533
Securities collateralized by par value	[4],[5]			$ 549
Coupon rate on underlying collateral	[4],[5]			1.13%
Maturity date of securities	[4],[5]			2021-07
Rate	[4],[5]			0.60%
Fair value repurchase agreements	[4],[5]			$ 533
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $500 Exchange-Traded Corporate Debt, Coupon 5.75 Percent, Maturity Date 2022 10
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 520
Securities collateralized by par value	[4],[5]			$ 500
Coupon rate on underlying collateral	[4],[5]			5.75%
Maturity date of securities	[4],[5]			2022-10
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 520
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $430 Exchange-Traded Corporate Debt, Coupon 5.13 Percent, Maturity Date 2021 10
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 449
Securities collateralized by par value	[4],[5]			$ 430
Coupon rate on underlying collateral	[4],[5]			5.13%
Maturity date of securities	[4],[5]			2021-10
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 449
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $360 Exchange-Traded Corporate Debt, Coupon 5.13 Percent, Maturity Date 2023 11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 373
Securities collateralized by par value	[4],[5]			$ 360
Coupon rate on underlying collateral	[4],[5]			5.13%
Maturity date of securities	[4],[5]			2023-11
Rate	[4],[5]			0.30%
Fair value repurchase agreements	[4],[5]			$ 373
Investments maturity date	[4],[5]			2017-01
Repurchase Agreements [Member] | RBC Capital Markets LLC Collateralized by Par Value $270 Exchange-Traded Corporate Debt, Coupon 7.75 Percent, Maturity Date 2021 06
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[4],[5]			$ 278
Securities collateralized by par value	[4],[5]			$ 270
Coupon rate on underlying collateral	[4],[5]			7.75%
Maturity date of securities	[4],[5]			2021-06
Rate	[4],[5]			(7.00%)
Fair value repurchase agreements	[4],[5]			$ 278
Investments maturity date	[4],[5]			2017-01
[1]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.
[2]	In general, securities received pursuant to repurchase agreements were delivered to counterparties in short sale transactions.
[3]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[4]	In general, securities received pursuant to repurchase agreements were delivered to counterparties in short sale transactions.
[5]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[6]	Classification percentages are based on Total Equity.
[7]	Classification percentages are based on Total Equity.
[8]	Repurchase agreement is between the Company and CILO 2016-LD1 Holdings LLC, an entity in which the Company has a beneficial interest and is co-owned by an affiliate of Ellington Management Group, L.L.C. CILO 2016-LD1 Holdings LLC owns subordinated notes issued by, as well as trust certificates representing ownership of, a securitization trust. See Note 9 to the Notes to Consolidated Financial Statements.
[9]	Repurchase agreement is between the Company and CILO 2016-LD1 Holdings LLC, an entity in which the Company has a beneficial interest and is co-owned by an affiliate of Ellington Management Group, L.L.C. CILO 2016-LD1 Holdings LLC owns subordinated notes issued by, as well as trust certificates representing ownership of, a securitization trust. See Note 9 to the Notes to Consolidated Financial Statements.

Consolidated Condensed Schedul7

Consolidated Condensed Schedule Of Investments (Investments Sold Short) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-		$ (642,240)		$ (584,896)
Proceeds from investments sold short		$ (640,202)		$ (589,429)
TBA - Fixed Rate Agency Securities Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(74.11%)	[1],[2],[3]	(62.77%)	[4],[5],[6]
Current Principal/Notional Amount		$ (442,197)		$ (384,155)
Investments sold short, at fair value-		(460,189)	[1],[3]	(404,728)	[4],[6]
Proceeds from investments sold short		(459,953)	[1],[3]	(404,967)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (69,372)	[1],[3]	$ (24,352)	[4],[6]
Rate		3.50%	[1],[3]	3.50%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (71,247)	[1],[3]	$ (24,960)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4 Point 00 Percent 201802 [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (68,000)
Rate	[1],[3]	4.00%
Investments maturity date	[1],[3]	2018-02
Investments sold short, at fair value-	[1],[3]	$ (71,028)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (55,000)	[1],[3]	$ (26,000)	[4],[6]
Rate		4.00%	[1],[3]	4.00%	[4],[6]
Investments maturity date		2018-02	[1],[3]	2017-02	[4],[6]
Investments sold short, at fair value-		$ (57,447)	[1],[3]	$ (27,295)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (43,220)
Rate	[1],[3]	3.50%
Investments maturity date	[1],[3]	2018-01
Investments sold short, at fair value-	[1],[3]	$ (44,618)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 4 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (35,000)	[1],[3]	$ (1,700)	[4],[6]
Rate		4.00%	[1],[3]	4.00%	[4],[6]
Investments maturity date		2018-02	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (36,485)	[1],[3]	$ (1,806)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4 Point 50 Percent 201802 [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (31,000)
Rate	[1],[3]	4.50%
Investments maturity date	[1],[3]	2018-02
Investments sold short, at fair value-	[1],[3]	$ (32,942)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (27,547)	[1],[3]	$ (87,767)	[4],[6]
Rate		4.00%	[1],[3]	4.00%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (28,815)	[1],[3]	$ (92,210)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 3 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (24,410)	[1],[3]	$ (21,940)	[4],[6]
Rate		3.50%	[1],[3]	3.50%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (25,249)	[1],[3]	$ (22,819)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (21,710)	[1],[3]	$ (50,930)	[4],[6]
Rate		4.50%	[1],[3]	4.50%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (23,097)	[1],[3]	$ (54,748)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (21,520)	[1],[3]	$ (20,740)	[4],[6]
Rate		3.00%	[1],[3]	3.00%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (21,923)	[1],[3]	$ (21,285)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (12,351)	[1],[3]	$ (23,151)	[4],[6]
Rate		4.50%	[1],[3]	4.50%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (13,134)	[1],[3]	$ (24,840)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (12,112)	[1],[3]	$ (4,612)	[4],[6]
Rate		3.00%	[1],[3]	3.00%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (12,113)	[1],[3]	$ (4,584)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (6,860)	[1],[3]	$ (6,860)	[4],[6]
Rate		5.50%	[1],[3]	5.50%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (7,520)	[1],[3]	$ (7,622)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (5,680)	[1],[3]	$ (31,620)	[4],[6]
Rate		5.00%	[1],[3]	5.00%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (6,104)	[1],[3]	$ (34,426)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (5,515)	[1],[3]	$ (3,155)	[4],[6]
Rate		3.00%	[1],[3]	3.00%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (5,517)	[1],[3]	$ (3,134)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (1,800)	[1],[3]	$ (6,500)	[4],[6]
Rate		3.00%	[1],[3]	3.00%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (1,813)	[1],[3]	$ (6,568)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (1,100)	[1],[3]	$ (8,790)	[4],[6]
Rate		3.50%	[1],[3]	3.50%	[4],[6]
Investments maturity date		2018-01	[1],[3]	2017-01	[4],[6]
Investments sold short, at fair value-		$ (1,137)	[1],[3]	$ (9,169)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 4 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (15,770)
Rate	[4],[6]			4.50%
Investments maturity date	[4],[6]			2017-01
Investments sold short, at fair value-	[4],[6]			$ (17,058)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (13,510)
Rate	[4],[6]			3.00%
Investments maturity date	[4],[6]			2017-01
Investments sold short, at fair value-	[4],[6]			$ (13,869)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 4 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (11,170)
Rate	[4],[6]			4.00%
Investments maturity date	[4],[6]			2017-01
Investments sold short, at fair value-	[4],[6]			$ (11,494)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% 2017 01 [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (20,558)
Rate	[4],[6]			4.00%
Investments maturity date	[4],[6]			2017-01
Investments sold short, at fair value-	[4],[6]			$ (21,611)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (2,530)
Rate	[4],[6]			3.50%
Investments maturity date	[4],[6]			2017-02
Investments sold short, at fair value-	[4],[6]			$ (2,633)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 3.50% 2017 02 [Member] | Mortgage-related Residential [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (2,500)
Rate	[4],[6]			3.50%
Investments maturity date	[4],[6]			2017-02
Investments sold short, at fair value-	[4],[6]			$ (2,597)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(44.61%)		(32.67%)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(19.27%)		(22.21%)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(10.23%)		(7.89%)
US Government Debt Securities [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(8.54%)	[2],[3]	(10.82%)	[5],[6]
Investments sold short, at fair value-		$ (53,021)	[3]	$ (69,762)	[6]
Proceeds from investments sold short		(53,322)	[3]	(69,946)	[6]
US Government Debt Securities [Member] | U.S. Treasury Note, 2.00 Percent, Maturity Date 2026 11 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (48,133)
Rate	[6]			2.00%
Investments maturity date	[6]			2026-11
Investments sold short, at fair value-	[6]			$ (46,287)
US Government Debt Securities [Member] | U.S. Treasury Note, 2.25 Percent, Maturity Date 2027 02 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (30,501)
Rate	[3]	2.25%
Investments maturity date	[3]	2027-02
Investments sold short, at fair value-	[3]	$ (30,108)
US Government Debt Securities [Member] | US Treasury Note, 1.88 Percent, Maturity Date 2020 12 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (14,000)
Rate	[3]	1.88%
Investments maturity date	[3]	2020-12
Investments sold short, at fair value-	[3]	$ (13,961)
US Government Debt Securities [Member] | U.S. Treasury Note, 1.75 Percent, Maturity Date 2022 05 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (6,000)
Rate	[3]	1.75%
Investments maturity date	[3]	2022-05
Investments sold short, at fair value-	[3]	$ (5,896)
US Government Debt Securities [Member] | U.S. Treasury Note, 2.25 Percent, Maturity Date 2027 11 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (2,223)
Rate	[3]	2.25%
Investments maturity date	[3]	2027-11
Investments sold short, at fair value-	[3]	$ (2,192)
US Government Debt Securities [Member] | US Treasury Note, 2.00 Percent, Maturity Date 2022 11 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (615)
Rate	[3]	2.00%
Investments maturity date	[3]	2022-11
Investments sold short, at fair value-	[3]	$ (610)
US Government Debt Securities [Member] | U.S. Treasury Bond, 2.25 Percent, Maturity Date 2046 08 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (281)
Rate	[3]	2.25%
Investments maturity date	[3]	2046-08
Investments sold short, at fair value-	[3]	$ (254)
US Government Debt Securities [Member] | US Treasury Note, 1.38 Percent, Maturity Date 2021 04 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (1,305)
Rate	[6]			1.38%
Investments maturity date	[6]			2021-04
Investments sold short, at fair value-	[6]			$ (1,280)
US Government Debt Securities [Member] | US Treasury Note, 1.25 Percent, Maturity Date 2021 10 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (800)
Rate	[6]			1.25%
Investments maturity date	[6]			2021-10
Investments sold short, at fair value-	[6]			$ (776)
US Government Debt Securities [Member] | US Treasury Note, 1.13 Percent, Maturity Date 2021 07 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (549)
Rate	[6]			1.13%
Investments maturity date	[6]			2021-07
Investments sold short, at fair value-	[6]			$ (531)
US Government Debt Securities [Member] | US Treasury Note, 1.13 Percent, Maturity Date 2021 09 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (1,968)
Rate	[6]			1.13%
Investments maturity date	[6]			2021-09
Investments sold short, at fair value-	[6]			$ (1,898)
US Government Debt Securities [Member] | US Treasury Note, 1.50 Percent, Maturity Date 2026 08 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (12,160)
Rate	[6]			1.50%
Investments maturity date	[6]			2026-08
Investments sold short, at fair value-	[6]			$ (11,179)
US Government Debt Securities [Member] | US Treasury Note, 1.75 Percent, Maturity Date 2021 11 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (4,726)
Rate	[6]			1.75%
Investments maturity date	[6]			2021-11
Investments sold short, at fair value-	[6]			$ (4,690)
US Government Debt Securities [Member] | US Treasury Note, 1.13 Percent, Maturity Date 2021 08 [Member] | Government [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (3,230)
Rate	[6]			1.13%
Investments maturity date	[6]			2021-08
Investments sold short, at fair value-	[6]			$ (3,121)
Foreign Government Debt Securities [Member] | Europe [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(5.98%)	[2],[3]	(9.72%)	[5],[6]
Investments sold short, at fair value-		$ (37,128)	[3]	$ (62,680)	[6]
Proceeds from investments sold short		(35,149)	[3]	(66,800)	[6]
Foreign Government Debt Securities [Member] | Sovereign Debt Securities [Member] | Government [Member] | Europe [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (20,754)
Investments maturity date	[6]			2020-11
Investments sold short, at fair value-	[6]			$ (21,219)
Foreign Government Debt Securities [Member] | Sovereign Debt Securities [Member] | Government [Member] | Europe [Member] | Minimum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[6]			0.25%
Foreign Government Debt Securities [Member] | Sovereign Debt Securities [Member] | Government [Member] | Europe [Member] | Maximum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[6]			0.65%
Foreign Government Debt Securities [Member] | Spanish Sovereign Bond, 0.25 Percent [Member] | Government [Member] | Europe [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (16,516)	[3]	$ (14,507)	[6]
Rate		0.25%	[3]	0.25%	[6]
Investments maturity date		2018-04	[3]	2018-04	[6]
Investments sold short, at fair value-		$ (16,556)	[3]	$ (14,614)	[6]
Foreign Government Debt Securities [Member] | Spanish Sovereign Bond, 0.75 Percent [Member] | Government [Member] | Europe [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (10,447)	[3]	$ (9,176)	[6]
Rate		0.75%	[3]	0.75%	[6]
Investments maturity date		2021-07	[3]	2021-07	[6]
Investments sold short, at fair value-		$ (10,704)	[3]	$ (9,379)	[6]
Foreign Government Debt Securities [Member] | Spanish Sovereign Bond, 2.75 Percent [Member] | Government [Member] | Europe [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (9,474)	[3]	$ (8,322)	[6]
Rate		2.75%	[3]	2.75%	[6]
Investments maturity date		2019-04	[3]	2019-04	[6]
Investments sold short, at fair value-		$ (9,868)	[3]	$ (8,888)	[6]
Foreign Government Debt Securities [Member] | Spanish Sovereign Bond, 1.15 Percent [Member] | Government [Member] | Europe [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (8,257)
Rate	[6]			1.15%
Investments maturity date	[6]			2020-07
Investments sold short, at fair value-	[6]			$ (8,580)
Government debt [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(14.52%)	[2],[3]	(20.54%)	[5],[6]
Investments sold short, at fair value-		$ (90,149)	[3]	$ (132,442)	[6]
Proceeds from investments sold short		$ (88,471)	[3]	$ (136,746)	[6]
Common Stock Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(5.91%)	[2],[3]	(1.26%)	[5],[6]
Investments sold short, at fair value-		$ (36,691)	[3]	$ (8,154)	[6]
Proceeds from investments sold short		(36,666)	[3]	(8,052)	[6]
Common Stock Sold Short [Member] | Exchange Traded Equity [Member] | Energy [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-	[3]	$ (68)
Investment Sold, Not yet Purchased, Balance, Shares	[3]	(1)
Common Stock Sold Short [Member] | Exchange Traded Equity [Member] | Financial [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-		$ (36,623)	[3]	$ (8,154)	[6]
Investment Sold, Not yet Purchased, Balance, Shares		(671)	[3]	(207)	[6]
Corporate Debt Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(8.89%)	[2],[3]	(6.14%)	[5],[6]
Investments sold short, at fair value-		$ (55,211)	[3]	$ (39,572)	[6]
Proceeds from investments sold short		(55,112)	[3]	(39,664)	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Basic Materials [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			(8,970)
Investments sold short, at fair value-	[6]			$ (8,717)
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Basic Materials [Member] | North America [Member] | Minimum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[6]			3.88%
Investments maturity date	[6]			2021-10
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Basic Materials [Member] | North America [Member] | Maximum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[6]			5.13%
Investments maturity date	[6]			2023-03
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Communications [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		(18,590)	[3]	$ (8,750)	[6]
Investments sold short, at fair value-		$ (17,196)	[3]	$ (8,551)	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Communications [Member] | North America [Member] | Minimum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		4.13%	[3]	5.25%	[6]
Investments maturity date		2022-07	[3]	2021-07	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Communications [Member] | North America [Member] | Maximum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		10.50%	[3]	9.25%	[6]
Investments maturity date		2027-03	[3]	2022-09	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Consumer [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (23,805)	[3]	$ (8,930)	[6]
Investments sold short, at fair value-		$ (23,854)	[3]	$ (8,695)	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Consumer [Member] | North America [Member] | Minimum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		2.88%	[3]	3.88%	[6]
Investments maturity date		2020-10	[3]	2022-01	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Consumer [Member] | North America [Member] | Maximum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		6.75%	[3]	6.88%	[6]
Investments maturity date		2026-05	[3]	2026-04	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Energy [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (13,311)	[3]	$ (10,597)	[6]
Investments sold short, at fair value-		$ (12,834)	[3]	$ (10,041)	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Energy [Member] | North America [Member] | Minimum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		3.25%	[3]	2.40%	[6]
Investments maturity date		2022-04	[3]	2021-06	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Energy [Member] | North America [Member] | Maximum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		8.25%	[3]	8.00%	[6]
Investments maturity date		2027-06	[3]	2025-01	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Financial [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (960)	[3]	$ (1,130)	[6]
Rate	[6]			4.13%
Investments maturity date	[6]			2022-02
Investments sold short, at fair value-		$ (1,019)	[3]	$ (1,121)	[6]
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Financial [Member] | North America [Member] | Minimum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	5.13%
Investments maturity date	[3]	2022-03
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Financial [Member] | North America [Member] | Maximum [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	5.25%
Investments maturity date	[3]	2024-09
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Technology Sector [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (330)
Rate	[3]	3.63%
Investments maturity date	[3]	2021-10
Investments sold short, at fair value-	[3]	$ (308)
Corporate Debt Sold Short [Member] | Various Issuer [Member] | Utilities [Member] | North America [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			$ (2,430)
Rate	[6]			6.25%
Investments maturity date	[6]			2022-07
Investments sold short, at fair value-	[6]			$ (2,447)
Investments Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(103.43%)	[2],[3]	(90.71%)	[5],[6]
Investments sold short, at fair value-		$ (642,240)	[3]	$ (584,896)	[6]
Proceeds from investments sold short		$ (640,202)	[3]	$ (589,429)	[6]
[1]	At December 31, 2017, the Company's short investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 44.61%, 19.27%, and 10.23% of Total Equity, respectively.
[2]	Classification percentages are based on Total Equity.
[3]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[4]	At December 31, 2016, the Company's short investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 32.67%, 22.21%, and 7.89% of Total Equity, respectively.
[5]	Classification percentages are based on Total Equity.
[6]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.

Consolidated Condensed Schedul8

Consolidated Condensed Schedule Of Investments (Financial Derivatives)		12 Months Ended
		Dec. 31, 2017USD ($)contracts		Dec. 31, 2016USD ($)contracts
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-	[1]	$ 28,165,000		$ 35,595,000
Derivative Liabilities	[1]	(36,273,000)		(18,687,000)
Net cost		31,474,000		40,724,000
Net proceeds		$ (27,463,000)		(12,012,000)
Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Future contract notional				$ 1,000,000
Future contract | contracts				1
Short [Member] | US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts		68		70
Short [Member] | Foreign Exchange Future [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts		216
Financial Derivatives - Assets [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-		$ 28,165,000	[2]	$ 35,595,000	[3]
Investment owned as a percentage of equity		4.54%	[2],[4]	5.52%	[3],[5]
Net cost		$ 31,474,000	[2]	$ 40,724,000	[3]
Financial Derivatives - Assets [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-		$ 28,116,000	[2]	$ 35,400,000	[3]
Investment owned as a percentage of equity		4.53%	[2],[4]	5.49%	[3],[5]
Net cost		$ 31,392,000	[2]	$ 40,491,000	[3]
Financial Derivatives - Assets [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-		$ 45,000	[2]	$ 29,000	[3]
Investment owned as a percentage of equity		0.01%	[2],[4]	0.00%	[3],[5]
Financial Derivatives - Assets [Member] | Options [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-		$ 4,000	[2]	$ 44,000	[3]
Investment owned as a percentage of equity		0.00%	[2],[4]	0.01%	[3],[5]
Net cost		$ 82,000	[2]	$ 133,000	[3]
Financial Derivatives - Assets [Member] | Warrant [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-	[3]			$ 106,000
Investment owned as a percentage of equity	[3],[5]			0.02%
Net cost	[3]			$ 100,000
Financial Derivatives - Assets [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-	[3]			$ 16,000
Investment owned as a percentage of equity	[3],[5]			0.00%
Financial Derivatives - Assets [Member] | North America [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-	[2],[6]	3,140,000
Financial Derivatives - Assets [Member] | North America [Member] | Warrant [Member] | Mortgage-related Residential [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[7]			$ 1,639,000
Financial derivatives–assets, at fair value-	[3],[7]			106,000
Financial Derivatives - Assets [Member] | Long [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		885,000	[2],[8]	1,202,000	[3],[9]
Financial derivatives–assets, at fair value-		$ 9,000	[2],[8]	$ 12,000	[3],[9]
Investment Maturity Date		2037-12	[2],[8]	2037-12	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 25,338,000	[2],[8]	$ 40,611,000	[3],[9]
Financial derivatives–assets, at fair value-		$ 1,429,000	[2],[8]	$ 2,744,000	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-12	[2],[8]	2018-12	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | Interest Rate Swaps [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 79,347,000	[2],[10]	$ 215,826,000	[3],[11]
Financial derivatives–assets, at fair value-		$ 969,000	[2],[10]	$ 2,274,000	[3],[11]
Financial Derivatives - Assets [Member] | Long [Member] | Interest Rate Swaps [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-03	[2],[10]	2017-12	[3],[11]
Financial Derivatives - Assets [Member] | Long [Member] | Interest Rate Swaps [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2025-12	[2],[10]	2045-01	[3],[11]
Financial Derivatives - Assets [Member] | Long [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member] | Credit Risk [Member] | Put Option [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[12]			$ 10,000,000
Financial derivatives–assets, at fair value-	[3],[12]			$ 0
Investment Maturity Date	[3],[12]			2017-01
Financial Derivatives - Assets [Member] | Long [Member] | Interest Rate Cap [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 113,453,000	[2],[13]	$ 61,908,000	[3],[14]
Financial derivatives–assets, at fair value-		$ 1,000	[2],[13]	$ 2,000	[3],[14]
Financial Derivatives - Assets [Member] | Long [Member] | Interest Rate Cap [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-03	[2],[13]	2018-03	[3],[14]
Financial Derivatives - Assets [Member] | Long [Member] | Interest Rate Cap [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2019-05	[2],[13]	2018-10	[3],[14]
Financial Derivatives - Assets [Member] | Long [Member] | Equity Option [Member] | Equity Market Risk [Member] | Call Option [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[15]			$ 16,000
Financial derivatives–assets, at fair value-	[3],[15]			$ 42,000
Investment Maturity Date	[3],[15]			2017-04
Financial Derivatives - Assets [Member] | Long [Member] | Equity Option [Member] | Consumer [Member] | Equity Market Risk [Member] | Call Option [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[16]	$ 16,000
Financial derivatives–assets, at fair value-	[2],[16]	$ 3,000
Investment Maturity Date	[2],[16]	2018-01
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-		$ 3,913,000	[2],[8]	$ 1,361,000	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		2,070,000	[2],[8]	760,000	[3],[9]
Financial derivatives–assets, at fair value-		$ 228,000	[2],[8]	$ 90,000	[3],[9]
Investment Maturity Date	[3],[9]			2021-03
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[8]	2021-12
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[8]	2022-12
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[8]	$ 10,165,000
Financial derivatives–assets, at fair value-	[2],[8]	$ 475,000
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[8]	2020-06
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[8]	2022-12
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 41,725,000	[2],[8]	$ 8,043,000	[3],[9]
Financial derivatives–assets, at fair value-		$ 2,525,000	[2],[8]	$ 973,000	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2019-03	[2],[8]	2019-03	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 8,250,000	[2],[8]	$ 4,120,000	[3],[9]
Financial derivatives–assets, at fair value-		$ 99,000	[2],[8]	$ 7,000	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2019-06	[2],[8]	2019-03	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-06	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Financial [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 1,180,000	[2],[8]	$ 1,120,000	[3],[9]
Financial derivatives–assets, at fair value-		$ 194,000	[2],[8]	$ 140,000	[3],[9]
Investment Maturity Date		2021-12	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Utilities [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 3,150,000	[2],[8]	$ 2,060,000	[3],[9]
Financial derivatives–assets, at fair value-		$ 392,000	[2],[8]	$ 151,000	[3],[9]
Investment Maturity Date	[3],[9]			2021-06
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Utilities [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[8]	2021-12
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Utilities [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[8]	2022-06
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-	[3],[17]			$ 155,000
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member] | Consumer [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[17]			3,130,000
Financial derivatives–assets, at fair value-	[3],[17]			$ 87,000
Investment Maturity Date	[3],[17]			2019-07
Financial Derivatives - Assets [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member] | Utilities [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[17]			$ 685,000
Financial derivatives–assets, at fair value-	[3],[17]			$ 68,000
Investment Maturity Date	[3],[17]			2020-02
Financial Derivatives - Assets [Member] | Short [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (28,733,000)	[2],[6]	$ (112,999,000)	[3],[18]
Financial derivatives–assets, at fair value-		$ 5,384,000	[2],[6]	$ 16,701,000	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2046-05	[2],[6]	2046-05	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2059-11	[2],[6]	2058-09	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | Interest Rate Swaps [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (866,398,000)	[2],[19]	$ (607,499,000)	[3],[20]
Financial derivatives–assets, at fair value-		$ 8,277,000	[2],[19]	$ 5,828,000	[3],[20]
Financial Derivatives - Assets [Member] | Short [Member] | Interest Rate Swaps [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-12	[2],[19]	2017-04	[3],[20]
Financial Derivatives - Assets [Member] | Short [Member] | Interest Rate Swaps [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2030-11	[2],[19]	2045-12	[3],[20]
Financial Derivatives - Assets [Member] | Short [Member] | Interest Rate Swaps Variable rates only [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[21]	$ (26,600,000)
Financial derivatives–assets, at fair value-	[2],[21]	$ 20,000
Financial Derivatives - Assets [Member] | Short [Member] | Interest Rate Swaps Variable rates only [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[21]	2018-04
Financial Derivatives - Assets [Member] | Short [Member] | Interest Rate Swaps Variable rates only [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[21]	2019-06
Financial Derivatives - Assets [Member] | Short [Member] | Eurodollar Future [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[22]			$ (13,000,000)
Financial derivatives–assets, at fair value-	[3],[22]			$ 10,000
Investment Maturity Date	[3],[22]			2017-09
Financial Derivatives - Assets [Member] | Short [Member] | US Treasury Note Futures [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (6,800,000)	[2],[23]	$ (7,000,000)	[3],[24]
Financial derivatives–assets, at fair value-		$ 45,000	[2],[23]	$ 19,000	[3],[24]
Investment Maturity Date		2018-03	[2],[23]	2017-03	[3],[24]
Financial Derivatives - Assets [Member] | Short [Member] | Forwards [Member] | Currency risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[25]			$ (6,529,000)
Financial derivatives–assets, at fair value-	[3],[25]			$ 16,000
Investment Maturity Date	[3],[25]			2017-03
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-		$ 4,975,000	[2],[6]	$ 999,000	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[6]	(2,590,000)
Financial derivatives–assets, at fair value-	[2],[6]	$ 77,000
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2021-06
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2022-06
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (21,975,000)	[2],[6]	(1,930,000)	[3],[18]
Financial derivatives–assets, at fair value-		$ 3,386,000	[2],[6]	$ 30,000	[3],[18]
Investment Maturity Date	[3],[18]			2021-06
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2018-12
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2022-06
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (11,385,000)	[2],[6]	$ (2,880,000)	[3],[18]
Financial derivatives–assets, at fair value-		$ 211,000	[2],[6]	$ 102,000	[3],[18]
Investment Maturity Date	[3],[18]			2021-12
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2018-12
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2022-12
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (28,392,000)	[2],[6]	$ (20,507,000)	[3],[18]
Financial derivatives–assets, at fair value-		$ 849,000	[2],[6]	$ 867,000	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-06	[2],[6]	2017-06	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[6]	2021-06	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Technology Sector [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[6]	$ (4,025,000)
Financial derivatives–assets, at fair value-	[2],[6]	$ 452,000
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Technology Sector [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2021-12
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Technology Sector [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2022-06
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Mortgage-related Residential [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (5,688,000)	[2],[6]	$ (7,077,000)	[3],[18]
Financial derivatives–assets, at fair value-		$ 3,140,000	[2],[6]	$ 5,326,000	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Mortgage-related Residential [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2035-05	[2],[6]	2035-05	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Mortgage-related Residential [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2035-12	[2],[6]	2035-12	[3],[18]
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Financial derivatives–assets, at fair value-	[2]	$ 0
Financial Derivatives - Assets [Member] | Short [Member] | North America [Member] | Total Return Swaps [Member] | Financial [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[26]	(10,317,000)
Financial derivatives–assets, at fair value-	[2],[26]	$ 0
Investment Maturity Date	[2],[26]	2019-07
Financial Derivatives - Liabilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (36,273,000)	[2]	$ (18,687,000)	[3]
Investment owned as a percentage of equity		(5.84%)	[2],[4]	(2.90%)	[3],[5]
Net proceeds		$ (27,463,000)	[2]	$ (12,012,000)	[3]
Financial Derivatives - Liabilities [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (35,292,000)	[2]	$ (18,115,000)	[3]
Investment owned as a percentage of equity		(5.68%)	[2],[4]	(2.81%)	[3],[5]
Net proceeds		$ (27,463,000)	[2]	$ (12,012,000)	[3]
Financial Derivatives - Liabilities [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (508,000)	[2]	$ (69,000)	[3]
Investment owned as a percentage of equity		(0.08%)	[2],[4]	(0.01%)	[3],[5]
Financial Derivatives - Liabilities [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (473,000)	[2]	$ (472,000)	[3]
Investment owned as a percentage of equity		(0.08%)	[2],[4]	(0.07%)	[3],[5]
Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2]			$ (31,000)
Investment owned as a percentage of equity	[3],[5]			(0.01%)
Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member] | Mortgage-related Residential [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[27]			$ 20,601,000
Derivative Liabilities	[3],[27]			$ (31,000)
Investment Maturity Date	[3],[27]			2017-02
Financial Derivatives - Liabilities [Member] | Long [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 6,827,000	[2],[8]	$ 16,026,000	[3],[9]
Derivative Liabilities		$ (980,000)	[2],[8]	$ (2,899,000)	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2049-03	[2],[8]	2047-01	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2063-05	[2],[8]	2063-05	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | Interest Rate Swaps [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 374,003,000	[2],[10]	$ 160,248,000	[3],[11]
Derivative Liabilities		$ (5,852,000)	[2],[10]	$ (4,396,000)	[3],[11]
Financial Derivatives - Liabilities [Member] | Long [Member] | Interest Rate Swaps [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-11	[2],[10]	2019-02	[3],[11]
Financial Derivatives - Liabilities [Member] | Long [Member] | Interest Rate Swaps [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2027-12	[2],[10]	2045-01	[3],[11]
Financial Derivatives - Liabilities [Member] | Long [Member] | Eurodollar Future [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[22]			$ 11,000,000
Derivative Liabilities	[3],[22]			$ (8,000)
Investment Maturity Date	[3],[22]			2017-06
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (9,133,000)	[2],[8]	$ (2,763,000)	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		2,590,000	[2],[8]	9,480,000	[3],[9]
Derivative Liabilities		$ (77,000)	[2],[8]	$ (1,107,000)	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2021-06	[2],[8]	2021-06	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-06	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 26,213,000	[2],[8]	$ 9,990,000	[3],[9]
Derivative Liabilities		$ (5,974,000)	[2],[8]	$ (430,000)	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2021-06	[2],[8]	2021-06	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 12,561,000	[2],[8]	$ 9,736,000	[3],[9]
Derivative Liabilities		$ (293,000)	[2],[8]	$ (298,000)	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2020-06	[2],[8]	2021-06	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 33,654,000	[2],[8]	$ 14,317,000	[3],[9]
Derivative Liabilities		$ (2,736,000)	[2],[8]	$ (928,000)	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2021-06	[2],[8]	2018-03	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[8]	2021-12	[3],[9]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Technology Sector [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[8]	$ 380,000
Derivative Liabilities	[2],[8]	$ (53,000)
Investment Maturity Date	[2],[8]	2022-12
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ 0	[2]	$ (249,000)	[3],[17]
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member] | Communications [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[17]			1,623,000
Derivative Liabilities	[3],[17]			$ (249,000)
Investment Maturity Date	[3],[17]			2019-07
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member] | Financial [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[26]	235,000
Derivative Liabilities	[2],[26]	$ 0
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member] | Financial [Member] | Minimum [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[26]	2019-07
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Total Return Swaps [Member] | Financial [Member] | Maximum [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[26]	2022-05
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Recovery Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2],[28]	$ (8,000)
Financial Derivatives - Liabilities [Member] | Long [Member] | North America [Member] | Recovery Swap [Member] | Consumer [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[28]	2,600,000
Derivative Liabilities	[2],[28]	$ (8,000)
Investment Maturity Date	[2],[28]	2019-06
Financial Derivatives - Liabilities [Member] | Long [Member] | Europe [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[9]			$ 11,000
Derivative Liabilities	[3],[9]			$ (6,000)
Investment Maturity Date	[3],[9]			2019-12
Financial Derivatives - Liabilities [Member] | Short [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (267,034,000)	[2],[6]	$ (49,306,000)	[3],[18]
Derivative Liabilities		$ (12,367,000)	[2],[6]	$ (2,840,000)	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-12	[2],[6]	2018-12	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-06	[2],[6]	2021-12	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | Interest Rate Swaps [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (59,246,000)	[2],[19]	$ (154,836,000)	[3],[20]
Derivative Liabilities		$ (163,000)	[2],[19]	$ (742,000)	[3],[20]
Financial Derivatives - Liabilities [Member] | Short [Member] | Interest Rate Swaps [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2020-09	[2],[19]	2017-08	[3],[20]
Financial Derivatives - Liabilities [Member] | Short [Member] | Interest Rate Swaps [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2045-12	[2],[19]	2045-11	[3],[20]
Financial Derivatives - Liabilities [Member] | Short [Member] | Interest Rate Swaps Variable rates only [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[29]			$ (100,200,000)
Derivative Liabilities	[3],[29]			$ (24,000)
Financial Derivatives - Liabilities [Member] | Short [Member] | Interest Rate Swaps Variable rates only [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[29]			2017-06
Financial Derivatives - Liabilities [Member] | Short [Member] | Interest Rate Swaps Variable rates only [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[29]			2019-06
Financial Derivatives - Liabilities [Member] | Short [Member] | Eurodollar Future [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[22]			$ (49,000,000)
Derivative Liabilities	[3],[22]			$ (61,000)
Financial Derivatives - Liabilities [Member] | Short [Member] | Eurodollar Future [Member] | Minimum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[22]			2017-03
Financial Derivatives - Liabilities [Member] | Short [Member] | Eurodollar Future [Member] | Maximum [Member] | Interest Rate Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[22]			2017-09
Financial Derivatives - Liabilities [Member] | Short [Member] | Forwards [Member] | Currency risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (42,306,000)	[2],[30]	$ (48,258,000)	[3],[25]
Derivative Liabilities		$ (473,000)	[2],[30]	$ (472,000)	[3],[25]
Investment Maturity Date		2018-03	[2],[30]	2017-03	[3],[25]
Financial Derivatives - Liabilities [Member] | Short [Member] | Foreign Exchange Future [Member] | Currency risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[31]	$ (27,000,000)
Derivative Liabilities	[2],[31]	$ (508,000)
Investment Maturity Date	[2],[31]	2018-03
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (6,789,000)	[2],[6]	$ (3,885,000)	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		(12,285,000)	[2],[6]	(2,260,000)	[3],[18]
Derivative Liabilities		$ (1,075,000)	[2],[6]	$ (93,000)	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2019-06	[2],[6]	2017-06	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Basic Materials [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[6]	2021-03	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (7,243,000)	[2],[6]	$ (3,140,000)	[3],[18]
Derivative Liabilities		$ (304,000)	[2],[6]	$ (44,000)	[3],[18]
Investment Maturity Date	[3],[18]			2020-06
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2018-12
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Communications [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2022-12
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (58,672,000)	[2],[6]	$ (30,901,000)	[3],[18]
Derivative Liabilities		$ (4,274,000)	[2],[6]	$ (3,097,000)	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-06	[2],[6]	2019-03	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Consumer [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-12	[2],[6]	2021-12	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (21,750,000)	[2],[6]	$ (5,150,000)	[3],[18]
Derivative Liabilities		$ (374,000)	[2],[6]	$ (80,000)	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2018-06	[2],[6]	2017-12	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Energy [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2022-06	[2],[6]	2021-12	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Financial [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[6]	$ 0
Derivative Liabilities	[2],[6]	$ 0
Investment Maturity Date	[2],[6]	2022-06
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Industrial Sector [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (4,410,000)	[2],[6]	$ (12,460,000)	[3],[18]
Derivative Liabilities		$ (86,000)	[2],[6]	$ (119,000)	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Industrial Sector [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2021-06	[2],[6]	2020-03	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Industrial Sector [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date		2021-12	[2],[6]	2021-12	[3],[18]
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Technology Sector [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (2,020,000)	[2],[6]	$ (3,020,000)	[3],[18]
Derivative Liabilities		$ (181,000)	[2],[6]	$ (345,000)	[3],[18]
Investment Maturity Date	[3],[18]			2020-03
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Technology Sector [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2019-06
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Technology Sector [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2022-12
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Utilities [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (4,455,000)	[2],[6]	$ (860,000)	[3],[18]
Derivative Liabilities		$ (495,000)	[2],[6]	$ (107,000)	[3],[18]
Investment Maturity Date	[3],[18]			2021-06
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Utilities [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2019-06
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Corporate Bonds [Member] | Utilities [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[2],[6]	2022-12
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Mortgage-related Residential [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[18]			$ (3,057,000)
Derivative Liabilities	[3],[18]			$ (256,000)
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Mortgage-related Residential [Member] | Minimum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[18]			2034-10
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Credit Default Swaps On Asset Backed Securities [Member] | Mortgage-related Residential [Member] | Maximum [Member] | Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[18]			2035-03
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Total Return Swaps [Member] | Financial [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[32]			$ (42,093,000)
Derivative Liabilities	[3],[32]			$ (55,000)
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Total Return Swaps [Member] | Financial [Member] | Minimum [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[32]			2017-05
Financial Derivatives - Liabilities [Member] | Short [Member] | North America [Member] | Total Return Swaps [Member] | Financial [Member] | Maximum [Member] | Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Investment Maturity Date	[3],[32]			2017-08
[1]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.
[2]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[3]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[4]	Classification percentages are based on Total Equity.
[5]	Classification percentages are based on Total Equity.
[6]	For short credit default swaps, the Company purchased protection.
[7]	Notional value represents number of shares that warrants are convertible into.
[8]	For long credit default swaps, the Company sold protection.
[9]	For long credit default swaps, the Company sold protection.
[10]	For long interest rate swap contracts, the Company pays a floating rate and receives a fixed rate.
[11]	For long interest rate swap contracts, the Company pays a floating rate and receives a fixed rate.
[12]	Represents the option on the part of a counterparty to enter into a credit default swap on a corporate bond index whereby the Company would receive a fixed rate and pay credit protection payments.
[13]	Notional value represents the amount on which interest payments are calculated to the extent the market interest rate exceeds the rate cap on the contract.
[14]	Notional value represents the amount on which interest payments are calculated to the extent the market interest rate exceeds the rate cap on the contract.
[15]	Notional value represents the number of common shares we have the option to purchase multiplied by the strike price.
[16]	Notional value represents the number of common shares we have the option to purchase multiplied by the strike price.
[17]	Notional value represents outstanding principal balance on underlying corporate debt.
[18]	For short credit default swaps, the Company purchased protection.
[19]	For short interest rate swap contracts, the Company pays a fixed rate and receives a floating rate.
[20]	For short interest rate swap contracts, the Company pays a fixed rate and receives a floating rate.
[21]	Represents interest rate "basis" swaps whereby the Company pays one floating rate and receives a different floating rate.
[22]	Every $1,000,000 in notional value represents one contract.
[23]	Notional value represents the total face amount of U.S. Treasury Notes underlying all contracts held; as of December 31, 2017, 68 contracts were held.
[24]	Notional value represents the total face amount of U.S. Treasury securities underlying all contracts held. As of December 31, 2016, a total of 70 contracts were held.
[25]	Notional value represents U.S. Dollars to be received by the Company at the maturity of the forward contract.
[26]	Notional value represents number of underlying shares multiplied by the closing price of the underlying security.
[27]	Notional value represents principal balance of mortgage loan purchase commitments. Actual loan purchases are contingent upon successful loan closings in accordance with agreed-upon parameters.
[28]	For long recovery swaps the Company receives a specified recovery rate in exchange for the actual recovery rate on the underlying.
[29]	Represents interest rate "basis" swaps whereby the Company pays one floating rate and receives a different floating rate.
[30]	Notional value represents U.S. Dollars to be received by the Company at the maturity of the forward contract.
[31]	Notional value represents the total face amount of foreign currency underlying all contracts held; as of December 31, 2017, 216 contracts were held.
[32]	Notional value represents number of underlying shares multiplied by the closing price of the underlying security.

Consolidated Statement Of Opera

Consolidated Statement Of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
INVESTMENT INCOME
Interest income		$ 89,629	$ 74,344		$ 101,783
Other income		4,331	5,841		2,813
Total investment income		93,960	80,185		104,596
EXPENSES
Base management fee to affiliate (Net of fee rebates of $332, $0, and $0, respectively)(1)	[1]	9,056	10,065		11,493
Interest expense		31,120	16,306		12,112
Other investment related expenses [Abstract]
Other investment related expenses - Servicing expense		4,132	3,770	[2]	2,657	[2]
Other investment related expenses- Debt Issuance Costs related to Other secured borrowings, at fair value		1,679	0	[2]	0	[2]
Other investment related expense - Other		3,943	4,300	[2]	2,955	[2]
Professional fees		2,915	3,474		3,129
Administration fees		720	1,123		1,355
Compensation expense		2,200	2,096		1,508
Insurance expense		498	597		641
Directors' fees and expenses		272	267		259
Share-based long term incentive plan unit expense		385	400		393
Other expenses		1,872	2,022		1,918
Total expenses		58,792	44,420		38,420
NET INVESTMENT INCOME		35,168	35,765		66,176
Net realized gain (loss) on:
Investments		3,924	2,729		34,384
Financial derivatives, excluding currency hedges		(12,153)	(40,758)		(15,096)
Financial derivatives—currency hedges		(6,420)	4,093		4,738
Foreign currency transactions		3,845	(5,597)		(3,073)
Total net realized gain (loss)		(10,804)	(39,533)		20,953
Change in net unrealized gain (loss) on:
Investments		7,374	(8,033)		(56,869)
Financial derivatives, excluding currency hedges		426	(5,964)		9,498
Financial derivatives—currency hedges		(526)	(1,580)		377
Foreign currency translation		4,326	3,643		(1,706)
Total change in net unrealized gain (loss)		11,600	(11,934)		(48,700)
Total Change in Net Unrealized Gain Loss On Investments, Financial derivatives, and Foreign currency translation		796	(51,467)		(27,747)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		35,964	(15,702)		38,429
Net Income (Loss) Attributable to Noncontrolling Interest		1,983	305		340
Net Income (Loss) Attributable to Parent		$ 33,981	$ (16,007)		$ 38,089
NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS PER SHARE:
Basic and Diluted (in usd per share)		$ 1.04	$ (0.48)		$ 1.13
CASH DIVIDENDS PER SHARE:
Dividends declared (in usd per share)		$ 1.76	$ 1.95		$ 2.45
[1]	See Note 9 for further details on management fee rebates.
[2]	Conformed to current period presentation.

Consolidated Statement Of Ope10

Consolidated Statement Of Operations Consolidated Statement of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Consolidated Statement of Operations (Parenthetical) [Abstract]
Management fee rebate	$ 160	$ 172	$ 0	$ 0	$ 332	[1]	$ 0	[1]	$ 0	[1]
[1]	See Note 9 for further details on management fee rebates.

Consolidated Statement Of Chang

Consolidated Statement Of Changes In Equity - USD ($) $ in Thousands		Total		Parent [Member]	Noncontrolling Interest [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2014				$ 782,155
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2014					$ 6,389
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2014		$ 788,544
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
NET INVESTMENT INCOME		66,176
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		20,953
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation		(48,700)
Net Income (Loss) Attributable to Parent		38,089		38,089
Net Income (Loss) Attributable to Noncontrolling Interest		340			340
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		38,429
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Contributions from non-controlling interests		2,153			2,153
Dividends	[1]	(83,460)	[2]	(82,940)	(520)
Distributions to non-controlling interest		(1,468)			(1,468)
Adjustment to non-controlling interest		0		(6)	6
Shares repurchased		(5,639)		(5,639)
Share-based LTIP awards		393		390	3
Net increase (decrease) in equity from transactions		(88,021)		(88,195)	174
Net increase (decrease) in equity		(49,592)		(50,106)	514
Stockholders' Equity Attributable to Parent at Dec. 31, 2015				732,049
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2015					6,903
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2015		738,952
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
NET INVESTMENT INCOME		35,765
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		(39,533)
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation		(11,934)
Net Income (Loss) Attributable to Parent		(16,007)		(16,007)
Net Income (Loss) Attributable to Noncontrolling Interest		305			305
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(15,702)
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Contributions from non-controlling interests		5,552			5,552
Dividends	[1]	(65,148)	[2]	(64,735)	(413)
Distributions to non-controlling interest		(5,249)			(5,249)
Adjustment to non-controlling interest		0		(15)	15
Shares repurchased		(14,028)		(14,028)
Share-based LTIP awards		400		397	3
Net increase (decrease) in equity from transactions		(78,473)		(78,381)	(92)
Net increase (decrease) in equity		(94,175)		(94,388)	213
Stockholders' Equity Attributable to Parent at Dec. 31, 2016		637,661		637,661
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2016		7,116			7,116
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2016		644,777
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
NET INVESTMENT INCOME		35,168
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		(10,804)
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation		11,600
Net Income (Loss) Attributable to Parent		33,981		33,981
Net Income (Loss) Attributable to Noncontrolling Interest		1,983			1,983
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		35,964
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Contributions from non-controlling interests		20,707			20,707
Dividends	[1]	(57,636)	[2]	(57,263)	(373)
Distributions to non-controlling interest		(8,594)			(8,594)
Adjustment to non-controlling interest		0		(21)	21
Shares repurchased		(14,642)		(14,642)
Share-based LTIP awards		385		383	2
Net increase (decrease) in equity from transactions		(59,780)		(71,543)	11,763
Net increase (decrease) in equity		(23,816)		(37,562)	13,746
Stockholders' Equity Attributable to Parent at Dec. 31, 2017		600,099		$ 600,099
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2017		20,862			$ 20,862
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2017		$ 620,961
[1]	For the years ended December 31, 2017, 2016, and 2015, dividends totaling $1.76, $1.95, and $2.45, respectively, per common share and convertible unit outstanding, were declared and paid.
[2]	The Company pays quarterly dividends in arrears, so a portion of the dividends paid in each calendar year relate to the prior year's earnings.

Consolidated Statement Of Cha12

Consolidated Statement Of Changes In Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Dividends (in usd per share)	$ 1.76	$ 1.95	$ 2.45

Consolidated Statement Of Cash

Consolidated Statement Of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 35,964	$ (15,702)	$ 38,429
Reconciliation of the net increase (decrease) in equity resulting from operations to net cash provided by (used in) operating activities:
Net realized (gain) loss on investments, financial derivatives, and foreign currency transactions		17,860	35,498	(23,454)
Change in net unrealized (gain) loss on investments and financial derivatives, and foreign currency translation		(13,750)	13,664	48,649
Amortization of premiums and accretion of discounts (net)		32,764	24,573	21,815
Purchase of investments		(2,849,027)	(2,246,552)	(3,381,699)
Proceeds from disposition of investments		1,962,711	2,032,219	3,570,304
Proceeds from principal payments of investments		286,426	276,880	284,166
Proceeds from investments sold short		1,718,668	1,430,898	1,461,459
Repurchase of investments sold short		(1,674,760)	(1,573,705)	(2,031,578)
Payments on financial derivatives		(103,499)	(354,814)	(505,956)
Proceeds from financial derivatives		109,496	394,038	416,103
Amortization of deferred debt issuance costs		97	0	0
Share-based long term incentive plan unit expense		385	400	393
Interest income related to consolidated securitization trust	[1]	(1,175)	0	0
Interest expense related to consolidated securitization trust	[1]	794	0	0
Debt issuance costs related to debt carried at fair value	[1]	1,679	0	0
Repurchase agreements		28,870	(79,119)	66,301
(Increase) decrease in assets:
Receivable for securities sold and financial derivatives		(30,888)	260,636	531,844
Due from brokers		(46,753)	47,954	5,360
Interest and principal receivable		(7,984)	(1,260)	167
Restricted cash		230	4,202	(4,857)
Other assets		(40,411)	1,910	(3,295)
Increase (decrease) in liabilities:
Due to brokers		(11,059)	(102,017)	92,573
Payable for securities purchased and financial derivatives		117,535	(80,197)	66,618
Accounts payable and accrued expenses		558	(299)	846
Other liabilities		424	(811)	828
Interest and dividends payable		2,444	1,654	(580)
Base management fee payable to affiliate		(303)	(357)	(190)
Net cash provided by (used in) operating activities		(462,704)	69,693	654,246
Cash flows provided by (used in) financing activities:
Contributions from non-controlling interests		20,707	5,552	2,153
Shares repurchased		(14,642)	(14,028)	(5,639)
Dividends paid		(57,636)	(65,148)	(83,460)
Distributions to non-controlling interests		(8,594)	(5,249)	(1,468)
Offering costs paid		0	0	(56)
Proceeds from issuance of Other secured borrowings		111,338	40,921	0
Principal payments on Other secured borrowings		(28,839)	(295)	(763)
Proceeds from issuance of Other secured borrowings, at fair value		106,590	0	0
Debt issuance costs related to Other secured borrowings, at fair value		(947)	0	0
Proceeds from issuance of senior notes		86,000	0	0
Debt issuance costs paid related to senior notes		(1,326)	0	0
Borrowings under reverse repurchase agreements		9,919,449	5,762,742	9,758,474
Repayments of reverse repurchase agreements		(9,745,437)	(5,854,823)	(10,253,718)
Net cash provided by (used in) financing activities		386,663	(130,328)	(584,477)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		(76,041)	(60,635)	69,769
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		123,274	183,909	114,140
CASH AND CASH EQUIVALENTS, END OF PERIOD		47,233	123,274	183,909
Supplemental disclosure of cash flow information:
Interest paid		28,006	15,296	12,112
Share-based long term incentive plan unit awards (non-cash)		385	400	393
Aggregate TBA trade activity (buys sells) (non-cash)		23,917,506	22,923,388	36,357,456
Purchase of investments (non-cash)		(25,318)	(44,914)	0
Proceeds from principal payments of investments (non-cash)		27,307	10,365	0
Proceeds from the disposition of investments (non-cash)		26,800	96,131	0
Payments made to open financial derivatives (non-cash)		0	(4,000)	0
Proceeds from financial derivatives (non-cash)		0	7,486	0
Proceeds from issuance of other secured borrowings (non-cash)		17,175	13,088	0
Principal payments on Other secured borrowings (non-cash)		(65,851)	(29,629)	0
Proceeds received from Other secured borrowings, at fair value (non-cash)		31,958	0	0
Principal payments on Other secured borrowings, at fair value (non-cash)		(13,442)	0	0
Debt issuance costs related to Other secured borrowings, at fair value (non-cash)		(732)	0	0
Borrowings under reverse repurchase agreements (non-cash)		33,329	0	0
Repayments of reverse repurchase agreements (non-cash)		$ (31,607)	$ (48,527)	$ 0
[1]	Related to non-qualified mortgage securitization transaction. See Note 6 for further details.

Organization and Investment Obj

Organization and Investment Objective	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Investment Objective	Organization and Investment Objective Ellington Financial LLC was formed as a Delaware limited liability company on July 9, 2007 and commenced operations on August 17, 2007. Ellington Financial Operating Partnership LLC (the "Operating Partnership"), a 99.3% owned consolidated subsidiary of Ellington Financial LLC, was formed as a Delaware limited liability company on December 14, 2012 and commenced operations on January 1, 2013. All of the Company's operations and business activities are conducted through the Operating Partnership. Ellington Financial LLC, the Operating Partnership, and their consolidated subsidiaries are hereafter collectively referred to as the "Company." All intercompany accounts are eliminated in consolidation. The Company is a specialty finance company that invests in a diverse array of financial assets, including residential mortgage-backed securities, or "RMBS," commercial mortgage-backed securities, or "CMBS," residential and commercial mortgage loans, consumer loans and asset-backed securities, or "ABS," backed by consumer loans, collateralized loan obligations, or "CLOs," corporate equity and debt securities (including distressed debt), non-mortgage and mortgage-related derivatives, equity investments in mortgage originators, and other strategic investments. Ellington Financial Management LLC ("EFM" or the "Manager") is an SEC-registered investment adviser and a registered commodity pool operator that serves as the Manager to the Company pursuant to the terms of its sixth amended and restated management agreement (the "Management Agreement"). EFM is an affiliate of Ellington Management Group, L.L.C., ("Ellington") an investment management firm that is registered as both an investment adviser and a commodity pool operator. In accordance with the terms of the Management Agreement, the Manager implements the investment strategy and manages the business and operations on a day-to-day basis for the Company and performs certain services for the Company, subject to oversight by the Company's Board of Directors ("Board of Directors").

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies (A) Basis of Presentation : The Company's consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States of America, or "U.S. GAAP," for investment companies, ASC 946, Financial Services—Investment Companies ("ASC 946"). The Company has determined that it meets the definition of an investment company under ASC 946 . ASC 946 requires, among other things, that investments be reported at fair value in the financial statements. Additionally under ASC 946 the Company generally will not consolidate its interest in any company other than in its subsidiaries that qualify as investment companies under ASC 946. The consolidated financial statements include the accounts of the Company, the Operating Partnership, and its subsidiaries. They also include certain securitization trusts which are designed to facilitate specific financing activities of the Company and represent a direct extension of the Company's business activities. All intercompany balances and transactions have been eliminated. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. (B) Valuation : The Company applies ASC 820-10, Fair Value Measurement ("ASC 820-10"), to its holdings of financial instruments. ASC 820-10 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the observability of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1—inputs to the valuation methodology are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Currently, the types of financial instruments the Company generally includes in this category are listed equities, exchange-traded derivatives, and cash equivalents; • Level 2—inputs to the valuation methodology other than quoted prices included in Level 1 are observable for the asset or liability, either directly or indirectly. Currently, the types of financial instruments that the Company generally includes in this category are Agency RMBS, U.S. Treasury securities and sovereign debt, certain non-Agency RMBS and CMBS, CLOs, and corporate debt, and actively traded derivatives, such as interest rate swaps and foreign currency forwards, and certain other over-the-counter derivatives; and • Level 3—inputs to the valuation methodology are unobservable and significant to the fair value measurement. The types of financial instruments that the Company generally includes in this category are certain RMBS, CMBS, and CLOs; ABS, credit default swaps, or "CDS," on individual ABS, distressed corporate debt, and total return swaps on distressed corporate debt, in each case where there is less price transparency. Also included in this category are residential and commercial mortgage loans, consumer loans, non-listed equities, private corporate debt and equity investments, and Other secured borrowings, at fair value. For certain financial instruments, the various inputs that management uses to measure fair value for such financial instrument may fall into different levels of the fair value hierarchy. In such cases, the determination of which category within the fair value hierarchy is appropriate for such financial instrument is based on the lowest level of input that is significant to the fair value measurement. ASC 820 prioritizes the various inputs that management uses to measure fair value with the highest priority to inputs that are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets (Level 1) and the lowest priority to inputs that are unobservable and significant to the fair value measurement (Level 3). The assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the financial instrument. The Company may use valuation techniques consistent with the market and income approaches to measure the fair value of its assets and liabilities. The market approach uses third-party valuations and information obtained from market transactions involving identical or similar assets or liabilities. The income approach uses projections of the future economic benefit of an instrument to determine its fair value, such as in the discounted cash flow methodology. The inputs or methodology used for valuing financial instruments are not necessarily an indication of the risk associated with investing in these financial instruments. The leveling of each financial instrument is reassessed at the end of each period. Transfers between levels of the fair value hierarchy are assumed to occur at the end of the reporting period. Summary Valuation Techniques For financial instruments that are traded in an "active market," the best measure of fair value is the quoted market price. However, many of the Company's financial instruments are not traded in an active market. Therefore, management generally uses third-party valuations when available. If third-party valuations are not available, management uses other valuation techniques, such as the discounted cash flow methodology. The following are summary descriptions, for various categories of financial instruments, of the valuation methodologies management uses in determining fair value of the Company's financial instruments in such categories. Management utilizes such methodologies to assign a good faith fair value (the estimated price that, in an orderly transaction at the valuation date, would be received to sell an asset, or paid to transfer a liability, as the case may be) to each such financial instrument. For mortgage-backed securities, or "MBS," including To Be Announced MBS, or "TBAs," CLOs, and distressed and non-distressed corporate debt and equity, management seeks to obtain at least one third-party valuation, and often obtains multiple valuations when available. Management has been able to obtain third-party valuations on the vast majority of these instruments and expects to continue to solicit third-party valuations in the future. Management generally values each financial instrument at the average of third-party valuations received and not rejected as described below. Third-party valuations are not binding, and while management generally does not adjust the valuations it receives, management may challenge or reject a valuation when, based on its validation criteria, management determines that such valuation is unreasonable or erroneous. Furthermore, based on its validation criteria, management may determine that the average of the third-party valuations received for a given instrument does not result in what management believes to be the fair value of such instrument, and in such circumstances management may override this average with its own good faith valuation. The validation criteria may take into account output from management's own models, recent trading activity in the same or similar instruments, and valuations received from third parties. The use of proprietary models requires the use of a significant amount of judgment and the application of various assumptions including, but not limited to, assumptions concerning future prepayment rates and default rates. Valuations for fixed-rate RMBS pass-throughs issued by a U.S. government agency or government-sponsored enterprise are typically based on observable pay-up data (pay-ups are price premiums for specified categories of fixed-rate pools relative to their TBA counterparts) or models that use observable market data, such as interest rates and historical prepayment speeds, and are validated against third-party valuations. Given their relatively high level of price transparency, Agency RMBS pass-throughs are typically designated as Level 2 assets. Non-Agency MBS, Agency interest only and inverse interest only RMBS, and CLOs are generally classified as either Level 2 or Level 3 based on analysis of available market data and/or third-party valuations. The Company's investments in distressed corporate debt can be in the form of loans as well as total return swaps on loans. These investments, as well as related non-listed equity investments, are generally designated as Level 3 assets. Valuations for total return swaps are typically based on prices of the underlying loans received from widely used third-party pricing services. Investments in non-distressed corporate bonds are generally also valued based on prices received from third-party pricing services, and many of these bonds, because they are very liquid with readily observable data, are generally classified as Level 2 holdings. Furthermore, the methodology used by the third-party valuation providers is reviewed at least annually by management, so as to ascertain whether such providers are utilizing observable market data to determine the valuations that they provide. For residential and commercial mortgage loans, consumer loans, and real estate owned properties, or "REO," management determines fair value by taking into account both external pricing data, when available, and internal pricing models. Non-performing mortgage loans and REO are typically valued based on management's estimates of the value of the underlying real estate, using information including general economic data, broker price opinions, or "BPOs," recent sales, property appraisals, and bids. Performing mortgage loans and consumer loans are typically valued using discounted cash flows based on market assumptions. Cash flow assumptions typically include projected default and prepayment rates and loss severities, and may include adjustments based on appraisals and BPOs. Mortgage and consumer loans and REO properties are classified as Level 3 assets. Securitized mortgage loans that are not deemed "qualified mortgage," or "QM," loans under the rules of the Consumer Financial Protection Bureau, or "non-QM loans," are held as part of a collateralized financing entity, or "CFE." A CFE is a variable interest entity, or "VIE," that holds financial assets, issues beneficial interests in those assets, and has no more than nominal equity, and for which the issued beneficial interests have contractual recourse only to the related assets of the CFE. ASC 810, Consolidation ("ASC 810"), allows the Company to elect to measure both the financial assets and financial liabilities of the CFE using the more observable of the fair value of the financial assets and the fair value of the financial liabilities of the CFE. The Company has elected the fair value option for initial and subsequent recognition of the debt issued by its consolidated securitization trusts and has determined such trust meets the definition of a CFE; see Note 6 for further discussion on the Company's securitization trusts. The Company has determined the inputs to the fair value measurement of the financial liabilities of its CFE to be more observable than those of the financial assets and, as a result, has used the fair value of the financial liabilities of the CFE to measure the fair value of the financial assets of the CFE. The fair value of the debt issued by the CFE is typically valued using discounted cash flows and other market data. The securitized non-QM loans, which are assets of the CFE, are included in Investments, at fair value on the Company's Consolidated Statement of Assets, Liabilities, and Equity. The debt issued by the CFE is included in Other secured borrowings, at fair value, on the Company's Consolidated Statement of Assets, Liabilities, and Equity. The securitized non-QM loans and the debt issued by the Company's CFE are both designated as Level 3 financial instruments. For financial derivatives with greater price transparency, such as CDS on asset-backed indices, CDS on corporate indices, certain options on the foregoing, and total return swaps on publicly traded equities, market-standard pricing sources are used to obtain valuations; these financial derivatives are generally designated as Level 2 instruments. Interest rate swaps, swaptions, and foreign currency forwards are typically valued based on internal models that use observable market data, including applicable interest rates and foreign currency rates in effect as of the measurement date; the model-generated valuations are then typically compared to counterparty valuations for reasonableness. These financial derivatives are also generally designated as Level 2 instruments. Financial derivatives with less price transparency, such as CDS on individual ABS, are generally valued based on internal models, and are typically designated as Level 3 instruments. In the case of CDS on individual ABS, the valuation process typically starts with an estimation of the value of the underlying ABS. In valuing its derivatives, the Company also considers the creditworthiness of both the Company and its counterparties, along with collateral provisions contained in each derivative agreement. Investments in private operating entities, such as mortgage originators, are valued based on available metrics, such as relevant market multiples and comparable company valuations, company specific-financial data including actual and projected results and independent third party valuation estimates. These investments are designated as Level 3 assets. The Company's repurchase agreements are carried at fair value based on their contractual amounts as the debt is short-term in nature. The Company's reverse repurchase agreements are carried at cost, which approximates fair value. Repurchase and reverse repurchase agreements are classified as Level 2 assets and liabilities based on the adequacy of the collateral and their short term nature. The Company's valuation process, including the application of validation criteria, is overseen by the Manager's Valuation Committee ("Valuation Committee"). The Valuation Committee includes senior level executives from various departments within the Manager, and each quarter, the Valuation Committee reviews and approves the valuations of the Company's investments. The valuation process also includes a monthly review by the Company's third-party administrator. The goal of this review is to replicate various aspects of the Company's valuation process based on the Company's documented procedures. Because of the inherent uncertainty of valuation, the estimated fair value of the Company's financial instruments may differ significantly from the values that would have been used had a ready market for the financial instruments existed, and the differences could be material to the Company's consolidated financial statements. (C) Purchase and Sales of Investments and Investment Income : Purchases and sales of investments are generally recorded on trade date, and realized and unrealized gains and losses are calculated based on identified cost. The Company amortizes premiums and accretes discounts on its debt investments. Coupon interest income on fixed-income investments is generally accrued based on the outstanding principal balance or notional value and the current coupon interest rate. For Agency RMBS and debt securities that are deemed to be of high credit quality at the time of purchase, premiums and discounts are amortized into interest income over the life of such securities using the effective interest method. For securities whose cash flows vary depending on prepayments, an effective yield retroactive to the time of purchase is periodically recomputed based on actual prepayments and changes in projected prepayment activity, and a catch-up adjustment is made to amortization to reflect the cumulative impact of the change in effective yield. For debt securities (including non-Agency MBS) that are deemed not to be of high credit quality at the time of purchase, interest income is recognized based on the effective interest method. For purposes of determining the effective interest rate, management estimates the future expected cash flows of its investment holdings based on assumptions including, but not limited to, assumptions for future prepayment rates, default rates, and loss severities (each of which may in turn incorporate various macro-economic assumptions, such as future housing prices). These assumptions are re-evaluated not less than quarterly. Principal write-offs are generally treated as realized losses. Changes in projected cash flows, as applied to the current amortized cost of the security, may result in a prospective change in the yield/interest income recognized on such securities. For each loan purchased with the expectation that both interest and principal will be paid in full, the Company generally amortizes or accretes any premium or discount over the life of the loan utilizing the effective interest method. However, on at least a quarterly basis based on current information and events, the Company re-assesses the collectability of interest and principal, and designates a loan as impaired either when any payments have become 90 or more days past due, or when, in the opinion of management, it is probable that the Company will be unable to collect either interest or principal in full. Once a loan is designated as impaired, as long as principal is still expected to be collectable in full, interest payments are recorded as interest income only when received (i.e., under the cash basis method); accruals of interest income are only resumed when the loan becomes contractually current and performance is demonstrated to be resumed. However, if principal is not expected to be collectable in full, the cost recovery method is used (i.e., no interest income is recognized, and all payments received—whether contractually interest or principal—are applied to cost). For each loan purchased with evidence of credit deterioration since origination and the expectation that either principal or interest will not be paid in full, interest income is generally recognized using the effective interest method for as long as the cash flows can be reasonably estimated. Here, instead of amortizing the purchase discount (i.e., the excess of the unpaid principal balance over the purchase price) over the life of the loan, the Company effectively amortizes the accretable yield (i.e., the excess of the Company's estimate of the total cash flows to be collected over the life of the loan over the purchase price). Not less than quarterly, the Company updates its estimate of the cash flows expected to be collected over the life of the loan, and revised yields are prospectively applied. To the extent that cash flows cannot be reasonably estimated, these loans are generally accounted for under the cost recovery method. For certain groups of consumer loans that the Company considers as having sufficiently homogeneous characteristics, the Company aggregates such loans into pools, and accounts for each such pool as a single asset. The pool is then treated analogously to a debt security deemed not to be of high credit quality, in that (i) the aggregate premium or discount for the pool is amortized or accreted into interest income based on the pool's effective interest rate; (ii) the effective interest rate is determined based on the net expected cash flows of the pool, taking into account estimates of prepayments, defaults, and loss severities; and (iii) estimates are updated not less than quarterly and revised yields are prospectively applied. In estimating future cash flows on the Company's debt investments, there are a number of assumptions that will be subject to significant uncertainties and contingencies, including, in the case of MBS, assumptions relating to prepayment rates, default rates, loan loss severities, and loan repurchases. These estimates require the use of a significant amount of judgment. The Company receives dividend income on certain of its equity investments and rental income on certain of its REO properties. These items of income are included on the Consolidated Statement of Operations in, "Other income." (D) Cash and Cash Equivalents : Cash and cash equivalents include cash and short term investments with original maturities of three months or less at the date of acquisition. Cash and cash equivalents typically include amounts held in an interest bearing overnight account and amounts held in money market funds, and these balances generally exceed insured limits. The Company holds its cash at institutions that it believes to be highly creditworthy. Restricted cash represents cash that the Company can use only for specific purposes. The Company's investments in money market funds are included in the Consolidated Condensed Schedule of Investments. See Note 15 for further discussion of restricted cash balances. (E) Financial Derivatives : The Company enters into various types of financial derivatives. The Company's financial derivatives are predominantly subject to bilateral collateral arrangements or clearing in accordance with the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010. The Company may be required to deliver or receive cash or securities as collateral upon entering into derivative transactions. In addition, changes in the relative value of derivative transactions may require the Company or the counterparty to post or receive additional collateral. In the case of cleared derivatives, the clearinghouse becomes the Company's counterparty and a futures commission merchant acts as an intermediary between the Company and the clearinghouse with respect to all facets of the related transaction, including the posting and receipt of required collateral. Cash collateral received by the Company is reflected on the Consolidated Statement of Assets, Liabilities, and Equity as "Due to Brokers." Conversely, cash collateral posted by the Company is reflected as "Due from Brokers" on the Consolidated Statement of Assets, Liabilities, and Equity. The major types of derivatives utilized by the Company are swaps, futures, options, and forwards. Swaps : The Company may enter into various types of swaps, including interest rate swaps, credit default swaps, and total return swaps. The primary risk associated with the Company's interest rate swap activity is interest rate risk. The primary risk associated with the Company's credit default swaps is credit risk and the primary risks associated with the Company's total return swap activity are equity market risk and credit risk. The Company is subject to interest rate risk exposure in the normal course of pursuing its investment objectives. Primarily to help mitigate interest rate risk, the Company enters into interest rate swaps. Interest rate swaps are contractual agreements whereby one party pays a floating interest rate on a notional principal amount and receives a fixed-rate payment on the same notional principal, or vice versa, for a fixed period of time. Interest rate swaps change in value with movements in interest rates. The Company enters into credit default swaps. A credit default swap is a contract under which one party agrees to compensate another party for the financial loss associated with the occurrence of a "credit event" in relation to a "reference amount" or notional value of a credit obligation (usually a bond, loan, or a basket of bonds or loans). The definition of a credit event may vary from contract to contract. A credit event may occur (i) when the underlying reference asset(s) fails to make scheduled principal or interest payments to its holders, (ii) with respect to credit default swaps referencing mortgage/asset-backed securities and indices, when the underlying reference obligation is downgraded below a certain rating level, or (iii) with respect to credit default swaps referencing corporate entities and indices, upon the bankruptcy of the underlying reference obligor. The Company typically writes (sells) protection to take a "long" position or purchases (buys) protection to take a "short" position with respect to underlying reference assets or to hedge exposure to other investment holdings. The Company enters into total return swaps in order to take a "long" or "short" position with respect to an underlying reference asset. The Company is subject to market price volatility of the underlying reference asset. A total return swap involves commitments to pay interest in exchange for a market-linked return based on a notional value. To the extent that the total return of the corporate debt, security, group of securities or index underlying the transaction exceeds or falls short of the offsetting interest obligation, the Company will receive a payment from or make a payment to the counterparty. Swaps change in value with movements in interest rates, credit quality, or total return of the reference securities. During the term of swap contracts, changes in value are recognized as unrealized gains or losses. When a contract is terminated, the Company realizes a gain or loss equal to the difference between the proceeds from (or cost of) the closing transaction and the Company's basis in the contract, if any. Periodic payments or receipts required by swap agreements are recorded as unrealized gains or losses when accrued and realized gains or losses when received or paid. Upfront payments paid and/or received by the Company to open swap contracts are recorded as an asset and/or liability on the Consolidated Statement of Assets, Liabilities, and Equity and are recorded as a realized gain or loss on the termination date. Futures Contracts : A futures contract is an exchange-traded agreement to buy or sell an asset for a set price on a future date. The Company enters into Eurodollar and/or U.S. Treasury security futures contracts to hedge its interest rate risk. The Company may also enter into various other futures contracts, including equity index futures and foreign currency futures. Initial margin deposits are made upon entering into futures contracts and can generally be either in the form of cash or securities. During the period the futures contract is open, changes in the value of the contract are recognized as unrealized gains or losses by marking-to-market to reflect the current market value of the contract. Variation margin payments are made or received periodically, depending upon whether unrealized losses or gains are incurred. When the contract is closed, the Company records a realized gain or loss equal to the difference between the proceeds of the closing transaction and the Company's basis in the contract. Options : The Company may purchase or write put or call options contracts or enter into swaptions. The Company enters into options contracts typically to help mitigate overall market, credit, or interest rate risk depending on the type of options contract. However, the Company also enters into options contracts from time to time for speculative purposes. When the Company purchases an options contract, the option asset is initially recorded at an amount equal to the premium paid, if any, and is subsequently marked-to-market. Premiums paid for purchasing options contracts that expire unexercised are recognized on the expiration date as realized losses. If an options contract is exercised, the premium paid is subtracted from the proceeds of the sale or added to the cost of the purchase to determine whether the Company has realized a gain or loss on the related transaction. When the Company writes an options contract, the option liability is initially recorded at an amount equal to the premium received, if any, and is subsequently marked-to-market. Premiums received for writing options contracts that expire unexercised are recognized on the expiration date as realized gains. If an options contract is exercised, the premium received is subtracted from the cost of the purchase or added to the proceeds of the sale to determine whether the Company has realized a gain or loss on the related investment transaction. When the Company enters into a closing transaction, the Company will realize a gain or loss depending upon whether the amount from the closing transaction is greater or less than the premiums paid or received. The Company may also enter into options contracts that contain forward-settling premiums. In this case, no money is exchanged upfront. Instead the agreed-upon premium is paid by the buyer upon expiration of the option, regardless of whether or not the option is exercised. Forward Currency Contracts : A forward currency contract is an agreement between two parties to purchase or sell a specific quantity of currency with the delivery and settlement at a specific future date and exchange rate. During the period the forward currency contract is open, changes in the value of the contract are recognized as unrealized gains or losses. When the contract is settled, the Company records a realized gain or loss equal to the difference between the proceeds of the closing transaction and the Company's basis in the contract. Commitments to Purchase Residential Mortgage Loans : The Company has entered into forward purchase commitments under flow agreements, whereby the Company commits to purchasing the loans based on pre-defined underwriting guidelines and at stated interest rates. Actual loan purchases are contingent upon successful loan closings. These commitments to purchase mortgage loans are classified as derivatives on the Company's Consolidated Statement of Assets, Liabilities, and Equity and are, therefore, recorded as assets or liabilities measured at fair value. Until the purchase commitment expires or the underlying loan closes, changes in the estimated fair value of such commitments are recognized as unrealized gains or losses in the Consolidated Statement of Operations. Financial derivatives disclosed on the Consolidated Condensed Schedule of Investments include: credit default swaps on asset-backed securities, credit default swaps on asset-backed indices, credit default swaps on corporate bond indices, credit default swaps on corporate bonds, interest rate swaps, total return swaps, futures contracts, foreign currency forwards, options contracts, warrants, and mortgage loan purchase commitments. Financial derivative assets are included in Financial derivatives—assets, at fair value on the Consolidated Statement of Assets, Liabilities, and Equity. Financial derivative liabilities are included in Financial derivatives—liabilities, at fair value on the Consolidated Statement of Assets, Liabilities, and Equity. In addition, financial derivative contracts are summarized by type on the Consolidated Condensed Schedule of Investments. (F) Investments Sold Short : When the Company sells securities short, it typically satisfies its security delivery settlement obligation by obtaining the security sold short from the same or a different counterparty. The Company generally is required to deliver cash or securities as collateral to the counterparty for the Company's obligation to return the borrowed security. The amount by which the market value of the obligation falls short of or exceeds the proceeds from the short sale is treated as an unrealized gain or loss, respectively. A realized gain or loss will be recognized upon the termination of a short sale if the market price is less or greater than the proceeds originally received. (G) Reverse Repurchase Agreements : The Company enters into reverse repurchase agreements with third-party broker-dealers whereby it sells securities under agreements to be repurchased at an agreed-upon price and date. The Company accounts for reverse repurchase agreements as collateralized borrowings, with the initial sale price representing the amount borrowed, and with the future repurchase price consisting of the amount borrowed plus interest, at the implied interest rate of the reverse repurchase agreement, on the amount borrowed over the term of the reverse repurchase agreement. The interest rate on a reverse repurchase agreement is based on competitive rates (or competitive market spreads, in the case of agreements with floating interest rates) at the time such agreement is entered into. When the Company enters into a reverse repurchase agreement, the lender establishes and maintains an account containing cash and/or securities having a value not less than the repurchase pri

Valuation

Valuation	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Valuation	Valuation The table below reflects the value of the Company's Level 1, Level 2, and Level 3 financial instruments at December 31, 2017 : Description Level 1 Level 2 Level 3 Total Assets: (In thousands) Cash equivalents $ 26,500 $ — $ — $ 26,500 Investments, at fair value- Agency residential mortgage-backed securities $ — $ 989,341 $ 6,173 $ 995,514 Private label residential mortgage-backed securities — 158,369 101,297 259,666 Private label commercial mortgage-backed securities — 28,398 12,347 40,745 Commercial mortgage loans — — 108,301 108,301 Residential mortgage loans — — 182,472 182,472 Collateralized loan obligations — 185,905 24,911 210,816 Consumer loans and asset-backed securities backed by consumer loans — — 135,258 135,258 Corporate debt — 51,246 23,947 75,193 Real estate owned — — 26,277 26,277 Corporate equity investments — — 37,465 37,465 Total investments, at fair value — 1,413,259 658,448 2,071,707 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities — — 3,140 3,140 Credit default swaps on corporate bond indices — 1,429 — 1,429 Credit default swaps on corporate bonds — 8,888 — 8,888 Credit default swaps on asset-backed indices — 5,393 — 5,393 Interest rate swaps — 9,266 — 9,266 Options 3 1 — 4 Futures 45 — — 45 Total financial derivatives–assets, at fair value 48 24,977 3,140 28,165 Repurchase agreements, at fair value — 155,949 — 155,949 Total investments, financial derivatives–assets, and repurchase agreements, at fair value $ 48 $ 1,594,185 $ 661,588 $ 2,255,821 Liabilities: Investments sold short, at fair value- Agency residential mortgage-backed securities $ — $ (460,189 ) $ — $ (460,189 ) Government debt — (90,149 ) — (90,149 ) Corporate debt — (55,211 ) — (55,211 ) Common stock (36,691 ) — — (36,691 ) Total investments sold short, at fair value (36,691 ) (605,549 ) — (642,240 ) Description Level 1 Level 2 Level 3 Total (continued) (In thousands) Financial derivatives–liabilities, at fair value- Credit default swaps on corporate bond indices $ — $ (12,367 ) $ — $ (12,367 ) Credit default swaps on corporate bonds — (15,930 ) — (15,930 ) Credit default swaps on asset-backed indices — (980 ) — (980 ) Interest rate swaps — (6,015 ) — (6,015 ) Futures (508 ) — — (508 ) Forwards — (473 ) — (473 ) Total financial derivatives–liabilities, at fair value (508 ) (35,765 ) — (36,273 ) Other secured borrowings, at fair value $ — $ — $ (125,105 ) $ (125,105 ) Total investments sold short, financial derivatives–liabilities, and other secured borrowings, at fair value $ (37,199 ) $ (641,314 ) $ (125,105 ) $ (803,618 ) The following table identifies the significant unobservable inputs that affect the valuation of the Company's Level 3 assets and liabilities as of December 31, 2017 : Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Private label residential mortgage-backed securities $ 40,870 Market Quotes Non Binding Third-Party Valuation $ 45.00 $ 183.00 $ 81.63 Collateralized loan obligations 10,288 Market Quotes Non Binding Third-Party Valuation 85.00 435.00 138.94 Corporate debt and non-exchange traded corporate equity 6,797 Market Quotes Non Binding Third-Party Valuation 8.88 105.63 82.94 Private label commercial mortgage-backed securities 7,577 Market Quotes Non Binding Third-Party Valuation 5.31 60.55 36.19 Agency interest only residential mortgage-backed securities 1,225 Market Quotes Non Binding Third-Party Valuation 10.14 18.21 15.25 Private label residential mortgage-backed securities 60,427 Discounted Cash Flows Yield 0.5 % 26.5 % 9.8 % Projected Collateral Prepayments 2.1 % 84.7 % 38.3 % Projected Collateral Losses 0.9 % 18.2 % 8.6 % Projected Collateral Recoveries 0.3 % 31.5 % 11.3 % Projected Collateral Scheduled Amortization 12.5 % 90.2 % 41.8 % 100.0 % Private label commercial mortgage-backed securities 4,770 Discounted Cash Flows Yield 4.3 % 42.5 % 18.6 % Projected Collateral Losses 1.1 % 5.2 % 2.5 % Projected Collateral Recoveries 2.8 % 17.1 % 8.5 % Projected Collateral Scheduled Amortization 80.1 % 96.1 % 89.0 % 100.0 % Corporate debt and non-exchange traded corporate equity 20,301 Discounted Cash Flows Yield 3.0 % 16.1 % 10.6 % (continued) Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Collateralized loan obligations $ 14,623 Discounted Cash Flows Yield 7.1 % 62.2 % 15.2 % Projected Collateral Prepayments 22.5 % 92.9 % 77.9 % Projected Collateral Losses 1.9 % 40.2 % 10.3 % Projected Collateral Recoveries 3.4 % 37.2 % 9.5 % Projected Collateral Scheduled Amortization — % 4.1 % 2.3 % 100.0 % Consumer loans and asset-backed securities backed by consumer loans 135,258 Discounted Cash Flows Yield 7.0 % 18.9 % 9.5 % Projected Collateral Prepayments 2.2 % 50.1 % 33.5 % Projected Collateral Losses 0.4 % 28.6 % 8.2 % Projected Collateral Scheduled Amortization 46.8 % 95.2 % 58.3 % 100.0 % Performing commercial mortgage loans 84,377 Discounted Cash Flows Yield 8.0 % 15.4 % 10.7 % Non-performing commercial mortgage loans and commercial real estate owned 49,610 Discounted Cash Flows Yield 11.4 % 36.5 % 17.7 % Months to Resolution 4.0 17.0 9.5 Performing residential mortgage loans 42,030 Discounted Cash Flows Yield 1.6 % 18.8 % 6.2 % Securitized residential mortgage loans (1) 132,424 Discounted Cash Flows Yield 3.5 % 3.5 % 3.5 % Non-performing residential mortgage loans and residential real estate owned 8,609 Discounted Cash Flows Yield 2.8 % 34.5 % 8.9 % Months to Resolution (2) 1.9 40.5 25.6 Credit default swaps on asset-backed securities 3,140 Net Discounted Cash Flows Projected Collateral Prepayments 19.8 % 26.5 % 22.4 % Projected Collateral Losses 14.6 % 23.8 % 19.7 % Projected Collateral Recoveries 5.8 % 14.3 % 10.6 % Projected Collateral Scheduled Amortization 45.5 % 51.0 % 47.3 % 100.0 % Agency interest only residential mortgage-backed securities 4,948 Option Adjusted Spread ("OAS") LIBOR OAS (3) 381 3,521 730 Projected Collateral Prepayments 51.2 % 100.0 % 69.1 % Projected Collateral Scheduled Amortization 0.0 % 48.8 % 30.9 % 100.0 % Non-exchange traded common equity investment in mortgage-related entity 2,814 Enterprise Value Equity Price-to-Book (4) 2.0x 2.0x 2.0x Non-exchange traded preferred equity investment in mortgage-related entity 20,774 Enterprise Value Equity Price-to-Book (4) 0.9x 0.9x 0.9x Non-controlling equity interest in limited liability company 5,033 Market Quotes Non Binding Third-Party Valuation of the Underlying Assets (5) $ 96.91 $ 96.91 $ 96.91 Non-controlling equity interest in limited liability company 5,693 Discounted Cash Flows Yield (5) 9.1% 9.1% 9.1% Other secured borrowings, at fair value (1) (125,105 ) Discounted Cash Flows Yield 2.8% 2.8% 2.8% (1) Securitized residential mortgage loans and Other secured borrowings, at fair value, represent financial assets and liabilities of the Company's CFE as discussed in Note 2. (2) Excludes certain loans that are re-performing. (3) Shown in basis points. (4) Represent an estimation of where market participants might value an enterprise on a price-to-book basis. (5) Represents the significant unobservable inputs used to fair value the financial instruments of the limited liability company. The fair value of such financial instruments is the largest component of the valuation of the limited liability company as a whole. Third-party non-binding valuations are validated by comparing such valuations to internally generated prices based on the Company's models and to recent trading activity in the same or similar instruments. For those instruments valued using discounted and net discounted cash flows, collateral prepayments, losses, recoveries, and scheduled amortization are projected over the remaining life of the collateral and expressed as a percentage of the collateral's current principal balance. Averages are weighted based on the fair value of the related instrument. In the case of credit default swaps on asset-backed securities, averages are weighted based on each instrument's bond equivalent value. Bond equivalent value represents the investment amount of a corresponding position in the reference obligation, calculated as the difference between the outstanding principal balance of the underlying reference obligation and the fair value, inclusive of accrued interest, of the derivative contract. For those assets valued using the LIBOR Option Adjusted Spread ("OAS") valuation methodology, cash flows are projected using the Company's models over multiple interest rate scenarios, and these projected cash flows are then discounted using the LIBOR rates implied by each interest rate scenario. The LIBOR OAS of an asset is then computed as the unique constant yield spread that, when added to all LIBOR rates in each interest rate scenario generated by the model, will equate (a) the expected present value of the projected asset cash flows over all model scenarios to (b) the actual current market price of the asset. LIBOR OAS is therefore model-dependent. Generally speaking, LIBOR OAS measures the additional yield spread over LIBOR that an asset provides at its current market price after taking into account any interest rate options embedded in the asset. The Company considers the expected timeline to resolution in the determination of fair value for its non-performing commercial and residential loans. Material changes in any of the inputs above in isolation could result in a significant change to reported fair value measurements. Additionally, fair value measurements are impacted by the interrelationships of these inputs. For example, for instruments subject to prepayments and credit losses, such as non-Agency RMBS and consumer loans and ABS backed by consumer loans, a higher expectation of collateral prepayments will generally be accompanied by a lower expectation of collateral losses. Conversely, higher losses will generally be accompanied by lower prepayments. Because the Company's credit default swaps on asset-backed security holdings represent credit default swap contracts whereby the Company has purchased credit protection, such credit default swaps on asset-backed securities generally have the directionally opposite sensitivity to prepayments, losses, and recoveries as compared to the Company's long securities holdings. Prepayments do not represent a significant input for the Company's commercial mortgage-backed securities and commercial mortgage loans. Losses and recoveries do not represent a significant input for the Company's Agency RMBS interest only securities, given the guarantee of the issuing government agency or government-sponsored enterprise. The table below reflects the value of the Company's Level 1, Level 2, and Level 3 financial instruments at December 31, 2016 : Description Level 1 Level 2 Level 3 Total Assets: (In thousands) Cash equivalents $ 90,000 $ — $ — $ 90,000 Investments, at fair value- Agency residential mortgage-backed securities $ — $ 868,345 $ 29,622 $ 897,967 U.S. Treasury securities — 5,419 — 5,419 Private label residential mortgage-backed securities — 53,525 90,083 143,608 Private label commercial mortgage-backed securities — — 43,268 43,268 Commercial mortgage loans — — 61,129 61,129 Residential mortgage loans — — 84,290 84,290 Collateralized loan obligations — — 44,956 44,956 Consumer loans and asset-backed securities backed by consumer loans (1) — — 107,157 107,157 Corporate debt — 55,091 25,004 80,095 Real estate owned — — 3,349 3,349 Corporate equity investments (1) 4,396 — 29,392 33,788 Total investments, at fair value 4,396 982,380 518,250 1,505,026 Description Level 1 Level 2 Level 3 Total (continued) (In thousands) Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities $ — $ — $ 5,326 $ 5,326 Credit default swaps on corporate bond indices — 2,744 — 2,744 Credit default swaps on corporate bonds — 2,360 — 2,360 Credit default swaps on asset-backed indices — 16,713 — 16,713 Interest rate swaps — 8,102 — 8,102 Total return swaps — — 155 155 Options 42 2 — 44 Futures 29 — — 29 Forwards — 16 — 16 Warrants — — 106 106 Total financial derivatives–assets, at fair value 71 29,937 5,587 35,595 Repurchase agreements, at fair value — 184,819 — 184,819 Total investments, financial derivatives–assets, and repurchase agreements, at fair value $ 4,467 $ 1,197,136 $ 523,837 $ 1,725,440 Liabilities: Investments sold short, at fair value- Agency residential mortgage-backed securities $ — $ (404,728 ) $ — $ (404,728 ) Government debt — (132,442 ) — (132,442 ) Corporate debt — (39,572 ) — (39,572 ) Common stock (8,154 ) — — (8,154 ) Total investments sold short, at fair value (8,154 ) (576,742 ) — (584,896 ) Financial derivatives–liabilities, at fair value- Credit default swaps on corporate bond indices — (2,840 ) — (2,840 ) Credit default swaps on corporate bonds — (6,654 ) — (6,654 ) Credit default swaps on asset-backed indices — (2,899 ) — (2,899 ) Credit default swaps on asset-backed securities — — (256 ) (256 ) Interest rate swaps — (5,162 ) — (5,162 ) Total return swaps — (55 ) (249 ) (304 ) Futures (69 ) — — (69 ) Forwards — (472 ) — (472 ) Mortgage loan purchase commitments — (31 ) — (31 ) Total financial derivatives–liabilities, at fair value (69 ) (18,113 ) (505 ) (18,687 ) Total investments sold short and financial derivatives–liabilities, at fair value $ (8,223 ) $ (594,855 ) $ (505 ) $ (603,583 ) (1) Conformed to current period presentation. The following table identifies the significant unobservable inputs that affect the valuation of the Company's Level 3 assets and liabilities as of December 31, 2016: Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Private label residential mortgage-backed securities $ 47,024 Market Quotes Non Binding Third-Party Valuation $ 2.00 $ 101.02 $ 67.51 Collateralized loan obligations 37,517 Market Quotes Non Binding Third-Party Valuation 9.42 100.25 83.36 Corporate debt and non-exchange traded corporate equity 19,017 Market Quotes Non Binding Third-Party Valuation 1.88 102.25 87.14 Private label commercial mortgage-backed securities 27,283 Market Quotes Non Binding Third-Party Valuation 5.17 77.75 40.88 Agency interest only residential mortgage-backed securities 23,322 Market Quotes Non Binding Third-Party Valuation 2.47 20.17 11.65 Total return swaps (94 ) Market Quotes Non Binding Third-Party Valuation (1) 98.25 99.50 98.77 Private label residential mortgage-backed securities 43,059 Discounted Cash Flows Yield 0.6 % 20.5 % 11.0 % Projected Collateral Prepayments 0.0 % 81.0 % 10.0 % Projected Collateral Losses 1.4 % 51.2 % 41.4 % Projected Collateral Recoveries 0.4 % 53.6 % 41.2 % Projected Collateral Scheduled Amortization 0.0 % 90.7 % 7.4 % 100.0 % Private label commercial mortgage-backed securities 15,985 Discounted Cash Flows Yield 8.8 % 57.0 % 23.6 % Projected Collateral Losses 0.1 % 5.3 % 2.2 % Projected Collateral Recoveries 0.9 % 20.5 % 10.7 % Projected Collateral Scheduled Amortization 77.8 % 99.0 % 87.1 % 100.0 % Corporate debt and warrants 10,080 Discounted Cash Flows Yield 19.7 % 19.7 % 19.7 % Collateralized loan obligations 7,439 Discounted Cash Flows Yield 11.2 % 50.3 % 20.5 % Projected Collateral Prepayments 11.4 % 55.2 % 45.5 % Projected Collateral Losses 4.5 % 28.3 % 10.7 % Projected Collateral Recoveries 1.5 % 27.2 % 8.6 % Projected Collateral Scheduled Amortization 29.8 % 51.5 % 35.2 % 100.0 % Consumer loans and asset-backed securities backed by consumer loans (2) 107,157 Discounted Cash Flows Yield 9.0 % 25.0 % 11.0 % Projected Collateral Prepayments 0.0 % 45.4 % 25.6 % Projected Collateral Losses 3.3 % 97.4 % 9.4 % Projected Collateral Scheduled Amortization 0.0 % 87.7 % 65.0 % 100.0 % Performing commercial mortgage loans 32,557 Discounted Cash Flows Yield 8.0 % 17.2 % 11.6 % (continued) Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Non-performing commercial mortgage loans and commercial real estate owned $ 30,222 Discounted Cash Flows Yield 10.2 % 27.8 % 16.3 % Months to Resolution 3.0 39.1 19.5 Performing residential mortgage loans 78,576 Discounted Cash Flows Yield 5.0 % 13.5 % 6.6 % Non-performing residential mortgage loans and residential real estate owned 7,413 Discounted Cash Flows Yield 5.8 % 39.9 % 9.7 % Months to Resolution 1.8 162.9 41.9 Credit default swaps on asset-backed securities 5,070 Net Discounted Cash Flows Projected Collateral Prepayments 19.3 % 29.8 % 22.7 % Projected Collateral Losses 15.3 % 27.6 % 22.2 % Projected Collateral Recoveries 4.7 % 15.3 % 8.7 % Projected Collateral Scheduled Amortization 43.2 % 50.2 % 46.4 % 100.0 % Non-exchange traded equity investments in commercial mortgage-related private partnerships 3,090 Discounted Cash Flows Yield 16.5 % 16.5 % 16.5 % Expected Holding Period (Months) 2.9 2.9 2.9 Agency interest only residential mortgage-backed securities 6,300 Option Adjusted Spread ("OAS") LIBOR OAS (3) 142 2,831 568 Projected Collateral Prepayments (2) 0.0 % 100.0 % 63.6 % Projected Collateral Scheduled Amortization 0.0 % 88.1 % 36.4 % 100.0 % Non-exchange traded preferred and common equity investment in mortgage-related entity 2,500 Enterprise Value Equity Price-to-Book (4) 1.3x 1.3x 1.3x Non-controlling equity interest in limited liability company (2) 7,315 Net Discounted Cash Flows Yield 8.5 % 8.5 % 8.5 % Non-exchange traded preferred equity investment in mortgage-related entity 12,500 Recent Transactions Transaction Price N/A N/A N/A (1) Represents valuations on underlying assets. (2) Conformed to current period presentation. (3) Shown in basis points. (4) Represent an estimation of where market participants might value an enterprise on a price-to-book basis. Third-party non-binding valuations are validated by comparing such valuations to internally generated prices based on the Company's models and to recent trading activity in the same or similar instruments. For those instruments valued using discounted and net discounted cash flows, collateral prepayments, losses, recoveries, and scheduled amortization are projected over the remaining life of the collateral and expressed as a percentage of the collateral's current principal balance. Averages are weighted based on the fair value of the related instrument. In the case of credit default swaps on asset-backed securities, averages are weighted based on each instrument's bond equivalent value. Bond equivalent value represents the investment amount of a corresponding position in the reference obligation, calculated as the difference between the outstanding principal balance of the underlying reference obligation and the fair value, inclusive of accrued interest, of the derivative contract. For those assets valued using the LIBOR Option Adjusted Spread valuation methodology, cash flows are projected using the Company's models over multiple interest rate scenarios, and these projected cash flows are then discounted using the LIBOR rates implied by each interest rate scenario. The LIBOR OAS of an asset is then computed as the unique constant yield spread that, when added to all LIBOR rates in each interest rate scenario generated by the model, will equate (a) the expected present value of the projected asset cash flows over all model scenarios to (b) the actual current market price of the asset. LIBOR OAS is therefore model-dependent. Generally speaking, LIBOR OAS measures the additional yield spread over LIBOR that an asset provides at its current market price after taking into account any interest rate options embedded in the asset. Material changes in any of the inputs above in isolation could result in a significant change to reported fair value measurements. Additionally, fair value measurements are impacted by the interrelationships of these inputs. For example, a higher expectation of collateral prepayments will generally be accompanied by a lower expectation of collateral losses. Conversely, higher losses will generally be accompanied by lower prepayments. Because the Company's credit default swaps on asset-backed security holdings represent credit default swap contracts whereby the Company has purchased credit protection, such default swaps on asset-backed securities generally have the directionally opposite sensitivity to prepayments, losses, and recoveries as compared to the Company's long securities holdings. Prepayments do not represent a significant input for the Company's commercial mortgage-backed securities and commercial mortgage loans. Losses and recoveries do not represent a significant input for the Company's Agency RMBS interest only securities, given the guarantee of the issuing government agency or government-sponsored enterprise. The tables below include a roll-forward of the Company's financial instruments for the years ended December 31, 2017 , 2016, and 2015 (including the change in fair value), for financial instruments classified by the Company within Level 3 of the valuation hierarchy. Level 3—Fair Value Measurement Using Significant Unobservable Inputs: Year Ended December 31, 2017 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Sales/ Transfers Into Level 3 Transfers Out of Level 3 Ending Balance as of December 31, 2017 Assets: Investments, at fair value- Agency residential mortgage-backed securities $ 29,622 $ (9,356 ) $ (956 ) $ (165 ) $ 3,867 $ (153 ) $ — $ (16,686 ) $ 6,173 Private label residential mortgage-backed securities 90,083 2,203 763 9,498 68,724 (54,690 ) 14,021 (29,305 ) 101,297 Private label commercial mortgage-backed securities 43,268 469 (3,596 ) 8,654 6,661 (37,665 ) — (5,444 ) 12,347 Commercial mortgage loans 61,129 921 419 1,957 78,333 (34,458 ) — — 108,301 Residential mortgage loans 84,290 (599 ) 1,602 3,536 140,535 (46,892 ) — — 182,472 Collateralized loan obligations 44,956 (6,833 ) 2,233 2,606 71,338 (76,775 ) — (12,614 ) 24,911 Consumer loans and asset-backed securities backed by consumer loans 107,157 (13,754 ) 855 (171 ) 129,525 (88,354 ) — — 135,258 Corporate debt 25,004 252 527 223 97,466 (99,525 ) — — 23,947 Real estate owned 3,349 — 411 322 25,516 (3,321 ) — — 26,277 Corporate equity investments 29,392 — 2,347 (512 ) 16,417 (10,179 ) — — 37,465 Total investments, at fair value 518,250 (26,697 ) 4,605 25,948 638,382 (452,012 ) 14,021 (64,049 ) 658,448 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities 5,326 — 270 (1,202 ) 137 (1,391 ) — — 3,140 Total return swaps 155 — 224 (155 ) 1 (225 ) — — — Warrants 106 — (100 ) (6 ) — — — — — Total financial derivatives– assets, at fair value 5,587 — 394 (1,363 ) 138 (1,616 ) — — 3,140 Total investments and financial derivatives–assets, at fair value $ 523,837 $ (26,697 ) $ 4,999 $ 24,585 $ 638,520 $ (453,628 ) $ 14,021 $ (64,049 ) $ 661,588 (In thousands) Ending Accreted Net Realized Change in Net Purchases/ Sales/ Transfers Into Level 3 Transfers Out of Level 3 Ending Liabilities: Financial derivatives–liabilities, at fair value- Credit default swaps on asset-backed securities $ (256 ) $ — $ (871 ) $ 939 $ 736 $ (548 ) $ — $ — $ — Total return swaps (249 ) — (554 ) 249 572 (18 ) — — — Total financial derivatives– liabilities, at fair value (505 ) — (1,425 ) 1,188 1,308 (566 ) — — — Other secured borrowings, at fair value: Other secured borrowings, at fair value — — — — — (125,105 ) — — (125,105 ) Total other secured borrowings, at fair value — — — — — (125,105 ) — — (125,105 ) Total financial derivatives– liabilities and other secured borrowings at fair value $ (505 ) $ — $ (1,425 ) $ 1,188 $ 1,308 $ (125,671 ) $ — $ — $ (125,105 ) All amounts of net realized and change in net unrealized gain (loss) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gain (loss) for both Level 3 financial instruments held by the Company at December 31, 2017 , as well as Level 3 financial instruments disposed of by the Company during the year ended December 31, 2017 . For Level 3 financial instruments held by the Company at December 31, 2017 , change in net unrealized gain (loss) of $10.6 million and $(1.2) million for the year ended December 31, 2017 relate to investments and financial derivatives–assets, respectively. As of June 30, 2017, the Company modified its procedures to determine the level within the hierarchy for certain financial instruments. Under the revised procedure, the Company examines financial instruments individually rather than in cohorts of like instruments as it had previously. As of December 31, 2017 , the Company transferred $64.0 million of securities from Level 3 to Level 2 and $14.0 million from Level 2 to Level 3. Transfers between these hierarchy levels were based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The leveling of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third-party pricing sources. Year Ended December 31, 2016 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Payments Sales/ Issuances Transfers Into Level 3 Transfers Out of Level 3 Ending Assets: Investments, at fair value- Agency residential mortgage-backed securities $ 24,918 $ (7,998 ) $ (536 ) $ 845 $ 12,665 $ (272 ) $ — $ — $ 29,622 Private label residential mortgage-backed securities 116,435 1,896 (2,748 ) 3,972 30,065 (55,407 ) 10,041 (14,171 ) 90,083 Private label commercial mortgage-backed securities 34,145 1,627 1,008 (6,081 ) 24,488 (11,919 ) — — 43,268 Commercial mortgage loans 66,399 2,463 1,920 (1,434 ) 39,684 (47,903 ) — — 61,129 Residential mortgage loans 22,089 467 774 (800 ) 102,224 (40,464 ) — — 84,290 Collateralized loan obligations 45,974 (3,829 ) 71 2,471 27,862 (27,593 ) — — 44,956 Consumer loans and asset-backed securities backed by consumer loans (1) 115,376 (10,668 ) (164 ) (3,711 ) 154,101 (147,777 ) — — 107,157 Corporate debt 27,028 (60 ) (8,326 ) 6,864 26,851 (27,353 ) — — 25,004 Real estate owned 12,522 — 2,256 (458 ) 17,526 (28,497 ) — — 3,349 Corporate equity investments (1) 22,088 — (144 ) (3,075 ) 44,680 (34,157 ) — — 29,392 Total investments, at fair value 486,974 (16,102 ) (5,889 ) (1,407 ) 480,146 (421,342 ) 10,041 (14,171 ) 518,250 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities 6,332 — 1,042 (667 ) 148 (1,529 ) — — 5,326 Total return swaps 85 — 3,070 70 57 (3,127 ) — — 155 Warrants 150 — (50 ) 6 7,486 (7,486 ) — — 106 Total financial derivatives– assets, at fair value 6,567 — 4,062 (591 ) 7,691 (12,142 ) — — 5,587 Total investments and financial derivatives–assets, at fair value $ 493,541 $ (16,102 ) $ (1,827 ) $ (1,998 ) $ 487,837 $ (433,484 ) $ 10,041 $ (14,171 ) $ 523,837 Liabilities: Investments sold short, at fair value Corporate debt $ (448 ) $ (1 ) $ 362 $ (228 ) $ 315 $ — $ — $ — $ — Total investments sold short, at fair value (448 ) (1 ) 362 (228 ) 315 — — — — Financial derivatives– liabilities, at fair value- Credit default swaps on asset-backed securities (221 ) — (323 ) (36 ) 324 — — — (256 ) Total return swaps (4,662 ) — (7,534 ) 4,413 8,214 (680 ) — — (249 ) Total financial derivatives– liabilities, at fair value (4,883 ) — (7,857 ) 4,377 8,538 (680 ) — — (505 ) Guarantees: Guarantees (828 ) — — 828 — — — — — Total guarantees (828 ) — — 828 — — — — — Total investments sold short, financial derivatives–liabilities, and guarantees, at fair value $ (6,159 ) $ (1 ) $ (7,495 ) $ 4,977 $ 8,853 $ (680 ) $ — $ — $ (505 ) (1) Conformed to current period presentation. All amounts of net realized and change in net unrealized gain (loss) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gain (loss) for both Level 3 financial instruments held by the Company at December 31, 2016 , as well as Level 3 financial instruments disposed of by the Company during the year ended December 31, 2016 . For Level 3 financial instruments held by the Company at December 31, 2016 , change in net unrealized gain (loss) of $(14.7) million , $(0.8) million , and $(0.2) million , for the year ended December 31, 2016 relate to investments, financial derivatives–assets, and financial derivatives–liabilities, respectively. As of December 31, 2016 , the Company transferred $14.2 million of non-Agency RMBS from Level 3 to Level 2. These assets were transferred from Level 3 to Level 2 based on an increased volume of observed trading of these and similar assets. This increase in observed trading activity led to greater price transparency for these assets, thereby making a Level 2 designation appropriate in the Company's view. In addition, as of December 31, 2016 , the Company transferred $10.0 million of non-Agency RMBS from Level 2 to Level 3. Since December 31, 2015, these securities exhibited indications of a reduced level of price transparency. Examples of such indications include wider spreads relative to similar securities and a reduction in observable transactions involving these and similar securities. Year Ended December 31, 2015 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Payments Sales/ Issuances Transfers Into Level 3 Transfers Out of Level 3 Ending Assets: Investments, at fair value- Agency residential mortgage-backed securities $ 31,385 $ (8,355 ) $ 223 $ 81 $ 6,977 $ (5,393 ) $ — $ — $ 24,918 Private label residential mortgage-backed securities 274,369 8,593 20,648 (16,429 ) 62,994 (191,902 ) 6,687 (48,525 ) 116,435 Private label commercial mortgage-backed securities 53,311 3,076 2,000 (4,183 ) 21,382 (41,441 ) — — 34,145 Commercial mortgage loans 28,309 1,895 1,114 (142 ) 69,778 (34,555 ) — — 66,399 Residential mortgage loans 27,482 1,363 2,372 (505 ) 19,555 (28,178 ) — — 22,089 Collateralized loan obligations 121,994 (21,110 ) 46 (4,033 ) 59,102 (110,025 ) — — 45,974 Consumer loans and asset-backed securities backed by consumer loans 24,294 (6,197 ) — 283 139,373 (42,377 ) — — 115,376 Corporate debt 42,708 60 (4,028 ) (6,882 ) 28,942 (33,772 ) — — 27,028 Real estate owned 8,635 — 1,168 381 14,155 (11,817 ) — — 12,522 Private corporate equity investments 14,512 — 116 (306 ) 8,347 (581 ) — — 22,088 Total investments, at fair value 626,999 (20,675 ) 23,659 (31,735 ) 430,605 (500,041 ) 6,687 (48,525 ) 486,974 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities $ 11,387 $ — $ (2,964 ) $ 2,098 $ 28 $ (4,217 ) $ — $ — $ 6,332 Total return swaps — — 113 85 — (113 ) — — 85 Warrants 100 — — — 50 — — — 150 Total financial derivatives– assets, at fair value 11,487 — (2,851 ) 2,183 78 (4,330 ) — — 6,567 Total investments and financial derivatives–assets, at fair value $ 638,486 $ (20,675 ) $ 20,808 $ (29,552 ) $ 430,683 $ (504,371 ) $ 6,687 $ (48,525 ) $ 493,541 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Payments Sales/ Issuances Transfers Into Level 3 Transfers Out of Level 3 Ending Liabilities: Investments sold short, at fair value Corporate debt $ — $ (2 ) $ 197 $ 228 $ 1,372 $ (2,243 ) $ — $ — $ (448 ) Total investments sold short, at fair value — (2 ) 197 228 1,372 (2,243 ) — — (448 ) Financial derivatives– liabilities, at fair value- Credit default swaps on asset-backed securities $ (239 ) $ — $ (102 ) $ 35 $ — $ 85 $ — $ — $ (221 ) Total return swaps — — 2,516 (4,662 ) 14 (2,530 ) — — (4,662 ) Total financial derivatives– liabilities, at fair value (239 ) — 2,414 (4,627 ) 14 (2,445 ) — — (4,883 ) Securitized debt: Securitized debt (774 ) (15 ) — 26 763 — — — — Total securitized debt (774 ) (15 ) — 26 763 — — — — Guarantees: Guarantees — — — (828 ) — — — — (828 ) Total guarantees — — — (828 ) — — — — (828 ) Total investments sold short, financial derivatives–liabilities, securitized debt, and guarantees, at fair value $ (1,013 ) $ (17 ) $ 2,611 $ (5,201 ) $ 2,149 $ (4,688 ) $ — $ — $ (6,159 ) All amounts of net realized and change in net unrealized gain (loss) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gain (loss) for both Level 3 financial instruments held by the Company at December 31, 2015, as well as Level 3 financial instruments disposed of by the Company du

To Be Announced RMBS

To Be Announced RMBS	12 Months Ended
	Dec. 31, 2017
To Be Announced RMBS [Abstract]
To Be Announced RMBS	To Be Announced RMBS In addition to investing in pools of Agency RMBS, the Company transacts in the forward settling TBA market. Pursuant to these TBA transactions, the Company agrees to purchase or sell, for future delivery, Agency RMBS with certain principal and interest terms and certain types of underlying collateral, but the particular Agency RMBS to be delivered is not identified until shortly before the TBA settlement date. TBAs are liquid and have quoted market prices and represent the most actively traded class of MBS. The Company accounts for its TBAs as purchases and sales and uses TBAs primarily for hedging purposes, typically in the form of short positions. However, the Company may also invest in TBAs for speculative purposes, including holding long positions. Overall, the Company typically holds a net short position. The Company does not generally take delivery of TBAs; rather, it settles the associated receivable and payable with its trading counterparties on a net basis. Transactions with the same counterparty for the same TBA that result in a reduction of the position are treated as extinguished. The fair value of the Company's long positions in TBA contracts are reflected on the Consolidated Condensed Schedule of Investments under TBA–Fixed-Rate Agency Securities and the fair value of the Company's positions in TBA contracts sold short are reflected on the Consolidated Condensed Schedule of Investments under TBA–Fixed-Rate Agency Securities Sold Short. The payables and receivables related to the Company's TBA securities are included on the Consolidated Statement of Assets, Liabilities, and Equity in Payable for securities purchased and Receivable for securities sold, respectively. The below table details TBA assets, liabilities, and the respective related payables and receivables as of December 31, 2017 and 2016: As of December 31, 2017 December 31, 2016 Assets: (In thousands) TBA securities, at fair value (Current principal: $118,806 and $67,720, respectively) $ 123,680 $ 70,525 Receivable for securities sold relating to unsettled TBA sales 460,666 406,708 Liabilities: TBA securities sold short, at fair value (Current principal: -$442,197 and -$384,155, respectively) $ (460,189 ) $ (404,728 ) Payable for securities purchased relating to unsettled TBA purchases (123,918 ) (70,347 ) Net short TBA securities, at fair value (336,509 ) (334,203 )

Financial Derivatives

Financial Derivatives	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivatives	Financial Derivatives Gains and losses on the Company's derivative contracts for the years ended December 31, 2017 and 2016 are summarized in the tables below: Year Ended December 31, 2017 : Year Ended December 31, 2017 Derivative Type Primary Risk Exposure Net Realized (1) Change in Net Unrealized Gain/(Loss) (2) (In thousands) Credit default swaps on asset-backed securities Credit $ (601 ) $ (263 ) Credit default swaps on asset-backed indices Credit (5,291 ) (817 ) Credit default swaps on corporate bond indices Credit (3,336 ) (459 ) Credit default swaps on corporate bonds Credit 205 907 Total return swaps Equity Market/Credit (1,825 ) 149 Interest rate swaps Interest Rate (1,171 ) 571 Futures Interest Rate/Currency (195 ) (423 ) Forwards Currency (6,390 ) (18 ) Warrants Equity Market (100 ) (5 ) Mortgage loan purchase commitments Interest Rate — 31 Options Credit/Interest Rate/Equity Market — 10 Total $ (18,704 ) $ (317 ) (1) Includes gain/(loss) on foreign currency transactions on derivatives in the amount of $(0.1) million , which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions. (2) Includes foreign currency translation on derivatives in the amount of $(0.2) million , which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation. Year Ended December 31, 2016 : Year Ended December 31, 2016 Derivative Type Primary Risk Net Realized (1) Change in Net Unrealized Gain/(Loss) (2) (In thousands) Credit default swaps on asset-backed securities Credit $ 719 $ (703 ) Credit default swaps on asset-backed indices Credit 3,935 (3,349 ) Credit default swaps on corporate bond indices Credit (36,195 ) (4,044 ) Credit default swaps on corporate bonds Credit (14 ) 712 Total return swaps Equity Market/Credit (12,987 ) 4,427 Interest rate swaps Interest Rate (2,912 ) (1,983 ) Futures Interest Rate/ Equity Market (84 ) 456 Forwards Currency 4,093 (1,580 ) Warrants Equity Market (50 ) 6 Mortgage loan purchase commitments Interest Rates — (23 ) Options Credit/Interest Rate/Equity Market 7,174 (413 ) Total $ (36,321 ) $ (6,494 ) (1) Includes gain/(loss) on foreign currency transactions on derivatives in the amount of $0.3 million , which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions. (2) Includes foreign currency translation on derivatives in the amount of $1.1 million , which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation. Year Ended December 31, 2015: Year Ended December 31, 2015 Derivative Type Primary Risk Exposure Net Realized Gain/(Loss) (1) Change in Net Unrealized Gain/(Loss) (2) (In thousands) Credit default swaps on asset-backed securities Credit $ (3,066 ) $ 2,133 Credit default swaps on asset-backed indices Credit (714 ) (285 ) Credit default swaps on corporate bond indices Credit (8,059 ) 7,503 Credit default swaps on corporate bonds Credit (1,005 ) 694 Total return swaps Equity Market/Credit 1,838 (4,564 ) Interest rate swaps (3) Interest Rates (9,603 ) 1,983 Futures Interest Rates/Equity Market 708 (676 ) Forwards Currency 4,738 377 Mortgage loan purchase commitments Interest Rates — (8 ) Options Credit/ 5,048 1,623 Total $ (10,115 ) $ 8,780 (1) Includes foreign currency translation on derivatives in the amount of $0.2 million , which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions. (2) Includes foreign currency translation on derivatives in the amount of $(1.1) million , which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation. (3) Includes a $1.5 million reimbursement from a third party. The tables below detail the average notional values of the Company's financial derivatives, using absolute value of month end notional values, for the years ended December 31, 2017 and 2016: Derivative Type Year Ended Year Ended (In thousands) Interest rate swaps $ 1,306,853 $ 1,731,368 Credit default swaps 531,008 1,586,923 Total return swaps 19,760 113,628 Futures 48,244 371,900 Options 94,415 357,260 Forwards 76,784 80,513 Warrants 378 1,640 Mortgage loan purchase commitments 1,585 6,143 From time to time the Company enters into credit derivative contracts for which the Company sells credit protection ("written credit derivatives"). As of December 31, 2017 and 2016, all of the Company's open written credit derivatives were credit default swaps on either mortgage/asset-backed indices (ABX and CMBX indices) or corporate bond indices (CDX), collectively referred to as credit indices, or on individual corporate bonds, for which the Company receives periodic payments at fixed rates from credit protection buyers, and is obligated to make payments to the credit protection buyer upon the occurrence of a "credit event" with respect to underlying reference assets. Written credit derivatives held by the Company at December 31, 2017 and 2016, are summarized below: Credit Derivatives December 31, 2017 December 31, 2016 (In thousands) Fair Value of Written Credit Derivatives, Net $ (4,770 ) $ (1,551 ) Fair Value of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1) $ (3,582 ) $ 4,552 Notional Value of Written Credit Derivatives (2) $ 177,588 $ 117,476 Notional Value of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1) $ (88,400 ) $ (68,357 ) (1) Offsetting transactions with third parties include purchased credit derivatives which have the same reference obligation. (2) The notional value is the maximum amount that a seller of credit protection would be obligated to pay, and a buyer of credit protection would receive upon occurrence of a "credit event." Movements in the value of credit default swap transactions may require the Company or the counterparty to post or receive collateral. Amounts due or owed under credit derivative contracts with an International Swaps and Derivatives Association, or "ISDA," counterparty may be offset against amounts due or owed on other credit derivative contracts with the same ISDA counterparty. As a result, the notional value of written credit derivatives involving a particular underlying reference asset or index has been reduced (but not below zero) by the notional value of any contracts where the Company has purchased credit protection on the same reference asset or index with the same ISDA counterparty. A credit default swap on a credit index or a corporate bond typically terminates at the stated maturity date in the case of corporate indices or bonds, or, in the case of ABX and CMBX indices, the date that all of the reference assets underlying the index are paid off in full, retired, or otherwise cease to exist. Implied credit spreads may be used to determine the market value of such contracts and are reflective of the cost of buying/selling credit protection. Higher spreads would indicate a greater likelihood that a seller will be obligated to perform ( i.e. , make payment) under the contract. In situations where the credit quality of the underlying reference assets has deteriorated, the percentage of notional values that would be paid up front to enter into a new such contract ("points up front") is frequently used as an indication of credit risk. Credit protection sellers entering the market in such situations would expect to be paid points up front corresponding to the approximate fair value of the contract. For the Company's written credit derivatives that were outstanding at December 31, 2017 , implied credit spreads on such contracts ranged between 15.4 and 1,945.7 basis points. For the Company's written credit derivatives that were outstanding at December 31, 2016, implied credit spreads on such contracts ranged between 68.5 and 636.6 basis points. Excluded from these spread ranges are contracts outstanding for which the individual spread is greater than 2,000 basis points. The Company believes that these contracts would be quoted based on estimated points up front. The total fair value of contracts with individual implied credit spreads in excess of 2,000 basis points was $(0.4) million and $(2.5) million as of December 31, 2017 and 2016, respectively. Estimated points up front on these contracts as of December 31, 2017 ranged between 51.4 and 71.6 points, and as of December 31, 2016 ranged between 45.0 and 72.6 points. Total net up-front payments (paid) or received relating to written credit derivatives outstanding at December 31, 2017 and 2016 were $(5.5) million and $(3.3) million , respectively.

Securitization Transactions (No

Securitization Transactions (Notes)	12 Months Ended
	Dec. 31, 2017
Securitization Transactions Text Block [Abstract]
Securitization Transactions [Text Block]	Securitization Transactions Participation in Multi-Seller Consumer Loan Securitization In August 2016, the Company participated in a securitization transaction whereby the Company, together with another entity managed by Ellington (the "co-participant"), sold consumer loans with an aggregate unpaid principal balance of approximately $124 million to a newly formed securitization trust (the "Issuer"). Of the $124 million in loans sold to the Issuer, the Company's share was 51% while the co-participant's share was 49% . The transfer was accounted for as a sale in accordance with ASC 860-10. As a result of the sale the Company recognized a realized loss in the amount of $(0.1) million . Pursuant to the securitization, the Issuer issued senior and subordinated notes in the principal amount of $87 million and $18.7 million , respectively. Trust certificates representing beneficial ownership of the Issuer were also issued. In connection with the transaction, and through a jointly owned newly formed entity (the "Acquiror"), the Company and the co-participant acquired all of the subordinated notes as well as the trust certificates in the Issuer. The Company and the co-participant acquired 51% and 49% , respectively, of the interests in the Acquiror. During 2017, at the co-participant's direction, the Acquiror sold the portion of the subordinated notes beneficially owned by the co-participant, and as a result as of December 31, 2017, the Company's total interest in the Acquiror increased to approximately 75% . The Company's interest in the Acquiror is accounted for as a beneficial interest and is included on the Consolidated Condensed Schedule of Investments in Corporate Equity Investments . The notes and trust certificates issued by the Issuer are backed by the cash flows from the underlying consumer loans. If there are breaches of representations and warranties with respect to any underlying consumer loans, the Company could, under certain circumstances, be required to purchase or replace such loans. Absent such breaches, the Company has no obligation to repurchase or replace any underlying consumer loans that become delinquent or otherwise default. Cash flows collected on the underlying consumer loans are distributed to service providers to the trust, noteholders, and trust certificate holders in accordance with the contractual priority of payments. In addition, another affiliate of Ellington (the "Administrator"), acts as the administrator for the securitization and is paid a monthly fee for its services. While the Company retains credit risk in the securitization trust through its beneficial ownership of the most subordinated interests of the securitization trust, which are the first to absorb credit losses on the securitized assets, the Company does not retain control of these assets or the power to direct the activities of the Issuer that most significantly impact the Issuer's economic performance. See Note 9 for further details on the Company’s participation in the multi-seller consumer loan securitization. Participation in CLO Transactions In June 2017, the Company and several other affiliates of Ellington (the "CLO I Co-Participants") participated in a CLO securitization transaction (the "CLO I Securitization"), collateralized by corporate loans and sponsored and managed by an affiliate of Ellington (the "CLO Manager"). Pursuant to the CLO I Securitization, a newly formed securitization trust (the "CLO I Issuer") issued various classes of notes totaling $373.6 million in face amount, which were in turn sold to unrelated third parties and the CLO I Co-Participants. The notes issued by the CLO Issuer are backed by the cash flows from the underlying corporate loans, including loans that will be purchased during the reinvestment period, which is expected to end in July 2019. The Company and one CLO I Co-Participant transferred corporate loans with a fair value of approximately $62.0 million and $141.7 million , respectively, to the CLO I Issuer in exchange for cash. The Company has no obligation to repurchase or replace securitized corporate loans that subsequently become delinquent or are otherwise in default, and the transfer by the Company was accounted for as a sale in accordance with ASC 860-10. As a result of the sale, the Company recognized a realized gain in the amount of $0.2 million . The Company and each of the CLO I Co-Participants purchased various classes of subordinated notes issued by the CLO I Issuer. In addition, the Company and the CLO I Co-Participants also funded a newly formed entity (the "Risk Retention Vehicle") to purchase approximately 25% of the unsecured subordinated notes issued by the CLO I Issuer, in order to comply with risk retention rules (the "Risk Retention Rules") under the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, as described below. The Company purchased a total of $36.6 million face amount of secured and unsecured subordinated notes for an aggregate purchase price of $35.9 million . The Company subsequently sold some of these notes, and as of December 31, 2017 the Company's remaining investment in these notes had an aggregate fair value of $24.3 million , and is included on the Company's Consolidated Condensed Schedule of Investments in Collateralized Loan Obligations. In addition to these investments, the Company holds an approximate 25% ownership interest in the Risk Retention Vehicle, with a fair value of $5.0 million , as of December 31, 2017, and is included on the Company's Consolidated Condensed Schedule of Investments in Corporate Equity Investments. Pursuant to the CLO I Securitization, the cash flows from the underlying loans are applied in accordance with the contractual priority of payments. Under the Risk Retention Rules, securitization sponsors are generally required to retain at least 5% of the economic interest in the credit risk of the securitized assets. The unsecured subordinated notes purchased by the Risk Retention Vehicle represent approximately 6% of the economic interest in the credit risk of the underlying corporate loans. While the Risk Retention Vehicle is generally required under the Risk Retention Rules to hold its investment in the CLO I Issuer for a specified minimum amount of time, the Company is not required to hold its investment in the Risk Retention Vehicle for such minimum period. The CLO Manager has full and exclusive management and control of the business of the Risk Retention Vehicle and is required to hold its investment in the Risk Retention Vehicle for the specified minimum amount of time under the Risk Retention Rules. The Company does not retain control of the assets nor does it have the power to direct the activities of either the CLO I Issuer or the Risk Retention Vehicle that most significantly impact each entity's economic performance. In December 2017, Ellington priced another CLO securitization (the "CLO II Securitization"). Participants in the CLO II Securitization include Ellington, the Company, several other affiliates of Ellington, and several third parties (the "CLO II Co-Participants"). This transaction closed in January 2018 and while certain details differ, it is structured similarly to the CLO I Securitization which closed in June 2017. The Company and each of the CLO II Co-Participants purchased various classes of notes issued by the CLO II Issuer. In accordance with the Company's accounting policy for recording investment transactions, these purchases were recorded on the trade date (CLO pricing date) rather than the closing date. The Company purchased a total of $18.2 million face amount of secured senior and secured and unsecured subordinated notes for an aggregate purchase price of $16.6 million . The Company subsequently sold the senior notes, and as of December 31, 2017 the Company's remaining investment in the subordinated notes had an aggregate fair value of $13.4 million , and is included on the Company's Consolidated Condensed Schedule of Investments in Collateralized Loan Obligations. Pursuant to the CLO II Securitization, the cash flows from the underlying loans are applied in accordance with the contractual priority of payments. Upon the closing of the transaction in January 2018, the Company will purchase an interest in the associated risk retention vehicle, which was formed in order for the CLO transaction to comply with the Risk Retention Rules. Prior to the CLO pricing date, the Company along with certain other CLO II Co-Participants that are also affiliates of Ellington advanced funds (in the form of loans) to the CLO II Issuer to enable it to establish a warehouse facility for the purpose of acquiring assets for the securitization. The CLO II Issuer will repay these loans upon the closing of the CLO transaction. As of December 31, 2017, the Company's loan receivable from the CLO II Issuer was in the amount of $16.9 million and is included on the Consolidated Statement of Assets, Liabilities and Equity in Other assets. The Company does not have the power to direct the activities of the CLO II Issuer that most significantly impact its economic performance. See Note 9 for further details on the Company’s participation in CLO transactions. Residential Loan Securitization In November 2017, the Company, through its wholly owned subsidiary, Ellington Financial REIT TRS LLC (the "Sponsor"), sponsored a $141.2 million securitization of non-QM loans. The Sponsor transferred $141.2 million of non-QM loans to a wholly owned, newly created entity (the "Depositor") and on November 15, 2017 (the "Closing Date") such loans were deposited into a newly created securitization trust (the "Issuing Entity"). Pursuant to the securitization, the Issuing Entity issued various classes of mortgage pass-through certificates (the "Certificates") totaling $141.2 million in face amount and which are backed by the cash flows from the underlying non-QM loans. In order to comply with the Risk Retention Rules, the Sponsor purchased the two most subordinated classes of Certificates and the excess cash flow certificates, with an aggregate value equal to 5.1% of the fair value of all Certificates issued. The Sponsor also purchased, for an aggregate purchase price of $0.7 million , the Certificates entitled to excess servicing fees, while the remaining classes of Certificates were purchased by unrelated third parties. The Certificates have a final scheduled distribution date of October 25, 2047. However, the Depositor may, at its sole option, purchase all of the outstanding Certificates (the "Optional Redemption") following the earlier of (1) the two year anniversary of the Closing Date or (2) the date on which the aggregate stated principal balance of the underlying non-QM loans has declined below 30% of the aggregate stated principal balance of the underlying non-QM loans as of October 1, 2017. The purchase price that the Depositor is required to pay in connection with the Optional Redemption is equal to the sum of the unpaid principal balance of each class of Certificates as of the redemption date and any accrued and unpaid interest thereon. In light of this Optional Redemption right held by the Depositor, the transfer of non-QM loans to the Issuing Entity does not qualify as a sale under ASC 860, Transfers and Servicing. In the event that certain breaches of representations or warranties are discovered with respect to any underlying non-QM loans, the Company could be required to repurchase or replace such loans. The Sponsor also serves as the servicing administrator and as such, is entitled to receive a monthly fee equal to one-twelfth of the product of (a) 0.03% and (b) the stated principal balance of the non-QM loans as of the first day of the related due period. The Sponsor in its role as servicing administrator provides direction and consent to the third-party servicer for certain loss mitigation activities. In certain circumstances, the servicing administrator will be required to reimburse the servicer for principal and interest advances and servicing advances made by the servicer. In light of the Company’s retained interests in the securitization, together with the Optional Redemption right and the Company's ability to direct the third-party servicer regarding certain loss mitigation activities, the Issuing Entity is deemed to be an extension of the Company's business. The non-QM loans held by the Issuing Entity are included on the Consolidated Condensed Schedule of Investments in Mortgage Loans. Interest income from these loans and the expenses related to the servicing of these loans are included in Interest income and Other investment related expenses—Servicing expense, respectively, on the Consolidated Statement of Operations. The Issuing Entity meets the definition of a CFE as defined in Note 2, and as a result the assets of the Issuing Entity have been valued using the fair value of the liabilities of the Issuing Entity, as such liabilities have been assessed to be more observable than such assets. The debt of the Issuing Entity is included in Other secured borrowings, at fair value on the Consolidated Statement of Assets, Liabilities, and Equity and is shown net of the Certificates held by the Company. The following table details the assets and liabilities of the consolidated securitization trust included in the Company’s Consolidated Statement of Assets, Liabilities, and Equity as of December 31, 2017 and 2016: As of (In thousands) December 31, 2017 December 31, 2016 Assets: Cash and cash equivalents $ 333 $ — Investments, at fair value 132,424 — Liabilities: Interest and dividends payable 333 — Other secured borrowings, at fair value 125,105 —

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2017
Debt [Line Items]
Borrowings	Borrowings Secured Borrowings The Company's secured borrowings consist of reverse repurchase agreements, Other secured borrowings, and Other secured borrowings, at fair value. As of December 31, 2017 and 2016, the Company's total secured borrowings were $1.392 billion and $1.058 billion , respectively. Reverse Repurchase Agreements The Company enters into reverse repurchase agreements. A reverse repurchase agreement involves the sale of an asset to a counterparty together with a simultaneous agreement to repurchase the transferred asset or similar asset from such counterparty at a future date. The Company accounts for its reverse repurchase agreements as collateralized borrowings, with the transferred assets effectively serving as collateral for the related borrowing. The Company's reverse repurchase agreements typically range in term from 30 to 180 days, although the Company also has reverse repurchase agreements that provide for longer or shorter terms. The principal economic terms of each reverse repurchase agreement—such as loan amount, interest rate, and maturity date—are typically negotiated on a transaction-by-transaction basis. Other terms and conditions, such as those relating to events of default, are typically governed under the Company's master repurchase agreements. Absent an event of default, the Company maintains beneficial ownership of the transferred securities during the term of the reverse repurchase agreement and receives the related principal and interest payments. Interest rates on these borrowings are generally fixed based on prevailing rates corresponding to the terms of the borrowings, and for most reverse repurchase agreements, interest is generally paid at the termination of the reverse repurchase agreement, at which time the Company may enter into a new reverse repurchase agreement at prevailing market rates with the same counterparty, repay that counterparty and possibly negotiate financing terms with a different counterparty, or choose to no longer finance the related asset. Some reverse repurchase agreements provide for periodic payments of interest, such as monthly payments. In response to a decline in the fair value of the transferred securities, whether as a result of changes in market conditions, security paydowns, or other factors, reverse repurchase agreement counterparties will typically make a margin call, whereby the Company will be required to post additional securities and/or cash as collateral with the counterparty in order to re-establish the agreed-upon collateralization requirements. In the event of increases in fair value of the transferred securities, the Company can generally require the counterparty to post collateral with it in the form of cash or securities. The Company is generally permitted to sell or re-pledge any securities posted by the counterparty as collateral; however, upon termination of the reverse repurchase agreement, or other circumstance in which the counterparty is no longer required to post such margin, the Company must return to the counterparty the same security that had been posted. At any given time, the Company seeks to have its outstanding borrowings under reverse repurchase agreements with several different counterparties in order to reduce the exposure to any single counterparty. The Company had outstanding borrowings under reverse repurchase agreements with twenty-three and twenty-one counterparties as of December 31, 2017 and 2016, respectively. At December 31, 2017 , approximately 19% of open reverse repurchase agreements were with one counterparty. As of December 31, 2016, there was no counterparty that held 15% or more of the Company's outstanding reverse repurchase agreements. As of December 31, 2017 remaining days to maturity on the Company's open reverse repurchase agreements ranged from 2 days to 1094 days and from 3 days to 320 days as of December 31, 2016. Interest rates on the Company's open reverse repurchase agreements ranged from (1.25)% to 4.94% as of December 31, 2017 and from 0.60% to 3.76% as of December 31, 2016. The following table details the Company's outstanding borrowings under reverse repurchase agreements for Agency RMBS, Credit assets (which include non-Agency MBS, CLOs, consumer loans, corporate debt, residential mortgage loans, and commercial mortgage loans and REO), and U.S. Treasury securities, by remaining maturity as of December 31, 2017 and 2016: (In thousands) December 31, 2017 December 31, 2016 Weighted Average Weighted Average Remaining Maturity Outstanding Borrowings Interest Rate Remaining Days to Maturity Outstanding Borrowings Interest Rate Remaining Days to Maturity Agency RMBS: 30 Days or Less $ 287,014 1.43 % 15 $ 405,725 0.83 % 18 31-60 Days 264,058 1.47 % 46 195,288 0.94 % 45 61-90 Days 277,950 1.63 % 74 149,965 0.97 % 74 91-120 Days — — % — 8,240 0.83 % 102 121-150 Days — — % — 11,798 0.96 % 131 151-180 Days 602 2.56 % 158 19,296 1.05 % 164 Total Agency RMBS 829,624 1.51 % 44 790,312 0.89 % 41 Credit: 30 Days or Less 37,433 2.61 % 13 94,849 2.55 % 16 31-60 Days 132,201 2.44 % 49 26,974 2.36 % 47 61-90 Days 130,875 2.75 % 77 41,522 2.43 % 77 91-120 Days — — % — 10,084 2.91 % 97 121-150 Days 8,551 3.79 % 128 1,239 2.73 % 124 151-180 Days 8,300 3.40 % 164 12,616 3.17 % 165 181-360 Days 5,090 3.59 % 280 50,557 3.46 % 316 > 360 Days 56,944 4.94 % 1094 — — % — Total Credit Assets 379,394 3.00 % 219 237,841 2.75 % 105 U.S. Treasury Securities: 30 Days or Less 297 1.70 % 2 5,428 0.91 % 4 Total U.S. Treasury Securities 297 1.70 % 2 5,428 0.91 % 4 Total $ 1,209,315 1.98 % 99 $ 1,033,581 1.32 % 56 Reverse repurchase agreements involving underlying investments that the Company sold prior to period end, for settlement following period end, are shown using their original maturity dates even though such reverse repurchase agreements may be expected to be terminated early upon settlement of the sale of the underlying investment. As of December 31, 2017 and 2016, the fair value of investments transferred as collateral under outstanding borrowings under reverse repurchase agreements was $1.41 billion and $1.15 billion , respectively. Collateral transferred under outstanding borrowings as of December 31, 2017 include investments in the amount of $10.6 million that were sold prior to period end but for which such sale had not yet settled. In addition the Company posted net cash collateral of $18.6 million and additional securities with a fair value of $1.3 million as of December 31, 2017 to its counterparties. Collateral transferred under outstanding borrowings as of December 31, 2016 include investments in the amount of $33.4 million that were sold prior to year end but for which such sale had not yet settled. In addition, the Company posted net cash collateral of $39.2 million and additional securities with a fair value of $2.7 million as of December 31, 2016 as a result of margin calls from various counterparties. As of December 31, 2017 and 2016 there were no counterparties for which the amount at risk relating to our repurchase agreements was greater than 10% of total equity. Other Secured Borrowings The Company was a party to various securitization transactions, which were accounted for as collateralized borrowings, to finance certain of its commercial mortgage loans and REO. As of December 31, 2016, the Company had outstanding borrowings in the amount of $24.1 million in connection with one such securitization, which is included under the caption Other secured borrowings on the Company's Consolidated Statement of Assets, Liabilities, and Equity. As of December 31, 2016, the fair value of commercial mortgage loans and REO collateralizing this borrowing was $42.0 million . This securitization was terminated in December 2017, upon which the Company immediately entered into a reverse repurchase agreement with the same counterparty to finance certain of its commercial mortgage loans and REO. See Note 9, Related Party Transactions, for further information on the Company's secured borrowings. In December 2017, the Company amended its non-recourse secured borrowing facility that is used to finance a portfolio of unsecured loans. The facility includes a reinvestment period ending in December 2019 (or earlier following an early amortization event), whereby the Company can vary its borrowings based on the size of its portfolio, subject to certain maximum limits. Following the reinvestment period, the facility will begin to amortize based on the collections from the underlying loans. The facility accrues interest on a floating rate basis. As of December 31, 2017 , the Company had outstanding borrowings under this facility in the amount of $57.9 million which is included under the caption Other secured borrowings, on the Company's Consolidated Statement of Assets, Liabilities, and Equity and the effective interest rate on this facility, inclusive of related deferred financing costs, was 4.34% as of December 31, 2017 . As of December 31, 2017, the fair value of unsecured loans collateralizing this borrowing was $89.7 million . In November 2017, the Company completed a securitization transaction, as discussed in Note 6, whereby it financed a portfolio of non-QM loans. As of December 31, 2017 the fair value of the Company’s outstanding liability associated with this securitization transaction was $125.1 million , representing the fair value of the securitization trust certificates held by third parties as of such date, and is included on Company's Consolidated Statement of Assets, Liabilities, and Equity in Other Secured Borrowings, at fair value. The weighted average coupon on the Certificates held by third parties was 2.89% as of December 31, 2017. As of December 31, 2017, the fair value of non-QM loans held in the securitization trust was $132.4 million . Unsecured Borrowings Senior Notes On August 18, 2017, the Company issued $86.0 million in aggregate principal amount of Senior Notes. The total net proceeds to the Company from the issuance of the Senior Notes was approximately $84.7 million , after deducting debt issuance costs. The Senior Notes bear an interest rate of 5.25% , subject to adjustment based on changes in the ratings, if any, of the Senior Notes. Interest on the Senior notes is payable semi-annually in arrears on March 1 and September 1 of each year, with the first interest payment date on March 1, 2018. The Senior Notes mature on September 1, 2022 . The Company may redeem the Senior Notes, at its option, in whole or in part, prior to March 1, 2022 at a price equal to 100% of the principal amount thereof, plus the applicable "make-whole" premium as of the applicable date of redemption. At any time on or after March 1, 2022, the Company may redeem the Senior Notes, in whole or in part, at a redemption price equal to 100% of the aggregate principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest. The Senior Notes are carried at amortized cost. There are a number of covenants, including several financial covenants, associated with the Senior Notes. As of December 31, 2017 the Company was in compliance with all of its covenants. The Company amortizes debt issuance costs over the life of the associated debt; the amortized portion of debt issuance costs is included in Interest expense on the Consolidated Statement of Operations. The Senior Notes have an effective interest rate of 5.55% , inclusive of debt issuance costs. The Senior Notes are unsecured and are effectively subordinated to secured indebtedness of the Company, to the extent of the value of the collateral securing such indebtedness. Schedule of Principal Repayments The following table details the Company's principal repayment schedule for outstanding borrowings as of December 31, 2017 : Year Reverse Repurchase Agreements (1) Other Secured Borrowings (2) Senior Notes (1) Total 2018 1,152,371 42,409 — 1,194,780 2019 — 140,608 — 140,608 2020 56,944 — — 56,944 2021 — — — — 2022 — — 86,000 86,000 Total $ 1,209,315 $ 183,017 $ 86,000 $ 1,478,332 (1) Reflects the Company's contractual principal repayment dates. (2) Reflects the Company's expected principal repayment dates.

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2017
Income Tax [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The Company has certain subsidiaries that have elected to be treated as corporations for U.S. federal income tax purposes. As of December 31, 2017 one such subsidiary had a deferred tax asset, resulting from a net operating loss carryforward, which was fully reserved through a valuation allowance. As of December 31, 2017, the deferred tax asset and the valuation allowance were valued at $4.0 million and $(4.0) million, respectively. New tax reform legislation enacted in late 2017 reduces the federal corporate income tax rate from 35% to 21% , effective January 1, 2018. This had the effect of reducing both the deferred tax asset and the valuation allowance from their values prior to the enactment.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company is party to a Management Agreement (which may be amended from time to time), pursuant to which the Manager manages the assets, operations, and affairs of the Company, in consideration of which the Company pays the Manager management and incentive fees. Effective November 3, 2015, the Board of Directors approved a Sixth Amended and Restated Management Agreement between the Company and the Manager. The descriptions of the Base Management Fees and Incentive Fees are detailed below. Base Management Fees The Operating Partnership pays the Manager 1.50% per annum of total equity of the Operating Partnership calculated in accordance with U.S. GAAP as of the end of each fiscal quarter (before deductions for base management fees and incentive fees payable with respect to such fiscal quarter), provided that total equity is adjusted to exclude one-time events pursuant to changes in U.S. GAAP, as well as non-cash charges after discussion between the Manager and the Company's independent directors, and approval by a majority of the Company's independent directors in the case of non-cash charges. Pursuant to the Company's management agreement, if the Company invests at issuance in the equity of any collateralized debt obligation that is managed, structured, or originated by Ellington or one of its affiliates, or if the Company invests in any other investment fund or other investment for which Ellington or one of its affiliates receives management, origination, or structuring fees, the base management and incentive fees payable by the Company to its Manager will be reduced by an amount equal to the applicable portion (as described in the management agreement) of any such management, origination, or structuring fees. Summary information —For the years ended December 31, 2017 , 2016, and 2015, the total base management fee incurred, net of fee rebates, was $9.1 million , $10.1 million , and $11.5 million , respectively. Incentive Fees The Manager is entitled to receive a quarterly incentive fee equal to the positive excess, if any, of (i) the product of (A) 25% and (B) the excess of (1) Adjusted Net Income (described below) for the Incentive Calculation Period (which means such fiscal quarter and the immediately preceding three fiscal quarters) over (2) the sum of the Hurdle Amounts (described below) for the Incentive Calculation Period, over (ii) the sum of the incentive fees already paid or payable for each fiscal quarter in the Incentive Calculation Period preceding such fiscal quarter. For purposes of calculating the incentive fee, "Adjusted Net Income" for the Incentive Calculation Period means the net increase in equity from operations of the Operating Partnership, after all base management fees but before any incentive fees for such period, and excluding any non-cash equity compensation expenses for such period, as reduced by any Loss Carryforward (as described below) as of the end of the fiscal quarter preceding the Incentive Calculation Period. For purposes of calculating the incentive fee, the "Loss Carryforward" as of the end of any fiscal quarter is calculated by determining the excess, if any, of (1) the Loss Carryforward as of the end of the immediately preceding fiscal quarter over (2) the Company's net increase in equity from operations (expressed as a positive number) or net decrease in equity from operations (expressed as a negative number) of the Operating Partnership for such fiscal quarter. As of December 31, 2017 , there was no Loss Carryforward. For purposes of calculating the incentive fee, the "Hurdle Amount" means, with respect to any fiscal quarter, the product of (i) one-fourth of the greater of (A) 9% and (B) 3% plus the 10-year U.S. Treasury rate for such fiscal quarter, (ii) the sum of (A) the weighted average gross proceeds per share of all common share and OP Unit issuances since inception of the Company and up to the end of such fiscal quarter, with each issuance weighted by both the number of shares and OP Units issued in such issuance and the number of days that such issued shares and OP Units were outstanding during such fiscal quarter, using a first-in first-out basis of accounting ( i.e. attributing any share and OP Unit repurchases to the earliest issuances first) and (B) the result obtained by dividing (I) retained earnings attributable to common shares and OP Units at the beginning of such fiscal quarter by (II) the average number of common shares and OP Units outstanding for each day during such fiscal quarter, (iii) the sum of the average number of common shares, LTIP Units, and OP Units outstanding for each day during such fiscal quarter. For purposes of determining the Hurdle Amount, issuances of common shares and OP Units (a) as equity incentive awards, (b) to the Manager as part of its base management fee or incentive fee and (c) to the Manager or any of its affiliates in privately negotiated transactions, are excluded from the calculation. The payment of the incentive fee will be in a combination of common shares and cash, provided that at least 10% of any quarterly payment will be made in common shares. Summary information —The Company did not incur any expense for incentive fees for either of the years ended December 31, 2017 , 2016, and 2015, since on a rolling four quarter basis, the Company's income did not exceed the prescribed hurdle amount. Termination Fees The Management Agreement requires the Company to pay a termination fee to the Manager in the event of (1) the Company's termination or non-renewal of the Management Agreement without cause or (2) the Company's termination of the Management Agreement based on unsatisfactory performance by the Manager that is materially detrimental to the Company or (3) the Manager's termination of the Management Agreement upon a default by the Company in the performance of any material term of the Management Agreement. Such termination fee will be equal to the amount of three times the sum of (i) the average annual Quarterly Base Management Fee Amounts paid or payable with respect to the two 12-month periods ending on the last day of the latest fiscal quarter completed on or prior to the date of the notice of termination or non-renewal and (ii) the average annual Quarterly Incentive Fee Amounts paid or payable with respect to the two 12-month periods ending on the last day of the latest fiscal quarter completed on or prior to the date of the notice of termination or non-renewal. Expense Reimbursement Under the terms of the Management Agreement the Company is required to reimburse the Manager for operating expenses related to the Company that are incurred by the Manager, including expenses relating to legal, accounting, due diligence, other services, and all other costs and expenses. The Company's reimbursement obligation is not subject to any dollar limitation. Expenses will be reimbursed in cash within 60 days following delivery of the expense statement by the Manager; provided, however, that such reimbursement may be offset by the Manager against amounts due to the Company from the Manager. The Company will not reimburse the Manager for the salaries and other compensation of the Manager's personnel except that the Company will be responsible for expenses incurred by the Manager in employing certain dedicated or partially dedicated personnel as further described below. The Company reimburses the Manager for the allocable share of the compensation, including, without limitation, wages, salaries, and employee benefits paid or reimbursed, as approved by the Compensation Committee of the Board of Directors to certain dedicated or partially dedicated personnel who spend all or a portion of their time managing the Company's affairs, based upon the percentage of time devoted by such personnel to the Company's affairs. In their capacities as officers or personnel of the Manager or its affiliates, such personnel will devote such portion of their time to the Company's affairs as is necessary to enable the Company to operate its business. For the years ended December 31, 2017 , 2016, and 2015, the Company reimbursed the Manager $6.4 million , $6.5 million , and $5.1 million , respectively, for previously incurred operating and compensation expenses. Equity Investments in Certain Mortgage Originators As of December 31, 2017 , the mortgage originators in which the Company holds equity investments represent related parties. Transactions that have been entered into with these related party mortgage originators are summarized below. The Company is a party to a mortgage loan purchase and sale flow agreement, with a mortgage originator in which the Company holds an investment in common stock, whereby the Company purchases residential mortgage loans that satisfy certain specified criteria. The Company has also provided a $5.0 million line of credit to the mortgage originator. Under the terms of this line of credit, the Company has agreed to make advances to the mortgage originator solely for the purpose of funding specifically identified residential mortgage loans designated for sale to the Company. To the extent the advances are drawn by the mortgage originator, it must pay interest, at a rate of 15.00% per annum, on the outstanding balance of each advance from the date the advance is made until such advance is repaid in full. The mortgage originator is required to repay advances in full no later than two business days following the date the Company purchases the related residential mortgage loans from the mortgage originator. As of December 31, 2017 , there were no advances outstanding. The Company has also entered into two agreements whereby it guarantees the performance of such mortgage originator under third-party master repurchase agreements. See Note 17, Commitments and Contingencies, for further information on the Company's guarantees of the third-party borrowing arrangements. In connection with another mortgage originator in which the Company holds an equity interest, the Company has certain obligations with respect to this mortgage originator. See Note 17, Commitments and Contingencies, for further information on such obligations. Consumer, Residential, and Commercial Loan Transactions with Affiliates The Company has investments in participation certificates related to consumer loans titled in the name of a related party of Ellington. Through its participation certificates, the Company has beneficial interests in the loan cash flows, net of servicing-related fees and expenses. The total fair value of the Company's beneficial interests in the net cash flows, was $11.7 million and $7.6 million as of December 31, 2017 and 2016, respectively, and is included on the Company's Consolidated Condensed Schedule of Investments in Consumer Loans and Asset-backed Securities backed by Consumer Loans. The Company purchases certain of its consumer loans through an affiliate, or the "Purchasing Entity." The Purchasing Entity has entered into purchase agreements, open-ended in duration, with third party consumer loan originators whereby it has agreed to purchase eligible consumer loans. The amount of loans purchased under these purchase agreements is dependent on, among other factors, the amount of loans originated in any given period by the selling originators. The Company and other affiliates of Ellington have entered into agreements with the Purchasing Entity whereby the Company and each of the affiliates have agreed to purchase their allocated portion (subject to monthly determination based on available capital and other factors) of the eligible loans acquired by the Purchasing Entity under each purchase agreement. Immediately after the Purchasing Entity purchases beneficial interests in the loans, the Company and other affiliates purchase such beneficial interests from the Purchasing Entity, at the same price paid by the Purchasing Entity. During the year ended December 31, 2017 , the Company purchased loans under these agreements with an aggregate principal balance of $102.6 million . As of December 31, 2017 , the estimated remaining contingent purchase obligations of the Company under these purchase agreements was approximately $163.3 million in principal balance. The Company's beneficial interests in the consumer loans purchased through the Purchasing Entity are evidenced by participation certificates issued by trusts that hold legal title to the loans. These trusts are owned by a related party of Ellington and were established to hold such loans. Through its participation certificates, the Company participates in the cash flows of the underlying loans held by each trust. The total amount of consumer loans held in the related party trusts, for which the Company has participating interests in the net cash flows, was $114.5 million and $43.2 million as of December 31, 2017 and 2016, respectively, and is included on the Company's Consolidated Condensed Schedule of Investments in Consumer Loans and Asset-backed Securities backed by Consumer Loans. The Company has investments in participation certificates related to residential mortgage loans and REO held in a trust owned by another related party of Ellington. Through its participation certificates, the Company participates in the cash flows of the underlying loans held by such trust. The total amount of residential mortgage loans and REO held in the related party trust, for which the Company has participating interests in the net cash flows, was $183.1 million and $86.0 million as of December 31, 2017 and 2016, respectively, and is included on the Company's Consolidated Condensed Schedule of Investments in Mortgage Loans as well as Real Estate Owned. The Company is a co-investor in certain small balance commercial loans with two other investors, including an unrelated third party and an affiliate of Ellington. These loans are held in a consolidated subsidiary of the Company. As of December 31, 2017 , the aggregate fair value of these loans was $27.9 million and the non-controlling interests held by the unrelated third party and the Ellington affiliate were $1.8 million and $5.3 million , respectively. Participation in Multi-Borrower Financing Facility The Company is a co-participant in an agreement with certain other entities managed by Ellington (the "Affiliated Entities") in order to facilitate the financing of certain small balance commercial mortgage loans and REO owned by the Company and the Affiliated Entities, respectively (the "SBC Assets"). In connection with the financing of the SBC Assets, each of the Company and the Affiliated Entities transferred their respective SBC Assets to a jointly owned entity (the "Jointly Owned Entity"), which in turn transferred these assets to a securitization trust. While the Company's SBC Assets were transferred to the securitization trust, the Company's SBC Assets and the related debt were not derecognized for financial reporting purposes, in accordance with ASC 860-10, because the Company continued to retain the risks and rewards of ownership of its SBC Assets. The Company's portion of the total debt outstanding as of December 31, 2016 was $24.1 million , and is included under the caption Other secured borrowings on the Company's Consolidated Statement of Assets, Liabilities, and Equity. The facility was terminated in December 2017 and replaced by a reverse repurchase agreement involving the same counterparty. In December 2017 the Company and the Affiliated Entities, together with the Jointly Owned Entity, terminated the securitization trust financing facility, and entered into amended agreements involving the same counterparty, a global financial institution, to facilitate the financing of the SBC Assets under a reverse repurchase agreement. In connection with this financing, the Company and the Affiliated Entities collectively transferred additional SBC Assets, not previously financed, to the Jointly Owned Entity. As of December 31, 2017, the Jointly Owned Entity has outstanding issued debt under the reverse repurchase agreement in the amount of $106.6 million . The Company's portion of this debt as of December 31, 2017 was $56.9 million and is included under the caption Reverse repurchase agreements on the Company's Consolidated Statement of Assets, Liabilities, and Equity. To the extent that there is a default under the reverse repurchase agreement, all of the assets of the Jointly Owned Entity, including those beneficially owned by any non-defaulting owners of the Jointly Owned Entity could be used to satisfy the outstanding obligations under the reverse repurchase agreement. As of December 31, 2017, no party to the reverse repurchase agreement was in default. In connection with this financing as of December 31, 2017 there was a receivable from the Jointly Owned Entity in the amount of $23.4 million which is included in Other assets on the Company's Consolidated Statement of Assets, Liabilities, and Equity. Multi-Seller Consumer Loan Securitization In December 2016, in order to facilitate the financing of the Company's share of the subordinated note held by the Acquiror, the Company entered into a repurchase agreement with the Acquiror (the "Acquiror Repurchase Agreement") whereby the Company's share of the subordinated note held by the Acquiror was transferred to the Company as collateral under the Acquiror Repurchase Agreement. The Company then re-hypothecated this collateral to a third-party lending institution pursuant to a reverse repurchase agreement (the "Reverse Agreement"). The Acquiror Repurchase Agreement is included on the Company's Consolidated Statement of Assets, Liabilities and Equity under the caption, Repurchase agreements, at fair value and on its Consolidated Condensed Schedule of Investments. The Company's obligation under the Reverse Agreement is included on its Consolidated Statement of Assets, Liabilities and Equity under the caption, Reverse repurchase agreements. As of December 31, 2017 the outstanding amounts under the Acquiror Repurchase Agreement and the Reverse Agreement were each $5.7 million and the fair value of the related collateral was $9.4 million . See Note 6 for details on the Company's participation in a multi-seller consumer loan securitization. See Note 6 for details of the Company's participation in the multi-seller consumer loan securitization. Participation in CLO Transactions As discussed in Note 6, in June 2017 and again in December 2017, the Company participated in securitization transactions, sponsored and managed by the CLO Manager. The CLO Co-Participants, certain CLO II Co-Participants, and the CLO Manager are deemed to be related parties of the Company. The CLO Manager is entitled to receive management and incentive fees in accordance with the respective management agreements between the CLO I Issuer and the CLO II Issuer (the "CLO Issuers") and the CLO Manager. In accordance with the Company's Management Agreement, the Manager rebates to the Company the portion of the management fees payable by each of the CLO Issuers to the CLO Manager that is allocable to the Company's participating interest in the unsecured subordinated notes issued by each of the CLO Issuers. For the year ended December 31, 2017, the amount of such fee rebates was $0.3 million .

Long-Term Incentive Plan Units

Long-Term Incentive Plan Units	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Long-Term Incentive Plan Units	Long-Term Incentive Plan Units LTIP Units held pursuant to the Company's incentive plans are generally exercisable by the holder at any time after vesting. Each unit is convertible into one common share. Costs associated with the LTIP Units issued under the Company's incentive plans are measured as of the grant date and expensed ratably over the vesting period. Total expense associated with LTIP Units issued under the Company's incentive plans for each of the years ended December 31, 2017 , 2016, and 2015 was $0.4 million . On September 12, 2017, The Company's Board of Directors authorized the issuance of 10,002 LTIP Units to its independent directors pursuant to the Company's 2017 Equity Incentive Plan. These LTIP Units will vest and become non-forfeitable on September 11, 2018. On December 12, 2017, the Company's Board of Directors authorized the issuance of 14,419 LTIP Units to certain of its partially dedicated employees pursuant to the Company's 2017 Equity Incentive Plan. These LTIP Units will vest and become non-forfeitable on December 12, 2018 with respect to 8,533 LTIP Units and December 12, 2019 with respect to 5,886 LTIP Units. The below table details on the Company's unvested LTIP Units as of December 31, 2017 : Grant Recipient Number of LTIP Units Granted Grant Date Vesting Date (1) Independent directors: 10,002 September 12, 2017 September 11, 2018 Partially dedicated employees: 8,533 December 12, 2017 December 12, 2018 5,886 December 12, 2017 December 12, 2019 5,583 December 13, 2016 December 13, 2018 Total unvested LTIP Units at December 31, 2017 30,004 (1) Date at which such LTIP Units will vest and become non-forfeitable. The following table summarizes issuance and exercise activity of the Company's LTIP Units for the years ended December 31, 2017 , 2016, and 2015: Year Ended Year Ended Year Ended Manager Director/ Employee Total Manager Director/ Employee Total Manager Director/ Employee Total LTIP Units Outstanding (12/31/2016, 12/31/2015, and 12/31/2014, respectively) 375,000 94,539 469,539 375,000 74,938 449,938 375,000 54,314 429,314 Granted — 24,421 24,421 — 22,076 22,076 — 22,571 22,571 Exercised — (2,801 ) (2,801 ) — (2,475 ) (2,475 ) — (1,947 ) (1,947 ) LTIP Units Outstanding (12/31/2017, 12/31/2016, and 12/31/2015, respectively) 375,000 116,159 491,159 375,000 94,539 469,539 375,000 74,938 449,938 LTIP Units Vested and Outstanding (12/31/2017, 12/31/2016, and 12/31/2015, respectively) 375,000 86,155 461,155 375,000 65,828 440,828 375,000 46,120 421,120 As of December 31, 2017 , there were an aggregate of 1,907,769 common shares underlying awards, including LTIP Units, available for future issuance under the Company's 2017 Equity Incentive Plan.

Non-controlling Interests

Non-controlling Interests	12 Months Ended
	Dec. 31, 2017
Noncontrolling Interest [Abstract]
Noncontrolling Interest Disclosure [Text Block]	Non-controlling Interests Operating Partnership Non-controlling interests include the interest in the Operating Partnership owned by an affiliate of the Manager and certain related parties. On January 1, 2013, 212,000 OP Units were purchased by the initial non-controlling interest member. Income allocated to the non-controlling interest is based on the non-controlling interest owners' ownership percentage of the Operating Partnership during the quarter, calculated using a daily weighted average of all common shares and convertible units outstanding during the quarter. Holders of OP Units are entitled to receive the same distributions that holders of common shares receive, and OP Units are convertible into common shares on a one-for-one basis, subject to specified limitations. OP Units are non-voting with respect to matters as to which common shareholders are entitled to vote. As of December 31, 2017 , non-controlling interest related to the outstanding 212,000 OP Units represented an interest of approximately 0.7% in the Operating Partnership. As of December 31, 2017 and 2016 non-controlling interest related to the outstanding 212,000 OP Units was $4.0 million and $4.1 million , respectively. Joint Venture Interests Non-controlling interests also include the interests of joint venture partners in various consolidated subsidiaries of the Company. These subsidiaries hold the Company's investments in certain commercial mortgage loans and REO. These joint venture partners participate in these subsidiaries on a pari passu basis with the Company at a predetermined percentage, and therefore participate in all income, expense, gains and losses of such subsidiaries. These joint venture partners make capital contributions to the subsidiaries as new approved investments are purchased by the subsidiaries, and are generally entitled to distributions when investments are sold or otherwise disposed of. As of December 31, 2017 and 2016 these joint venture partners' interests in subsidiaries of the Company were $16.7 million and $3.0 million , respectively. These joint venture partners' interests are not convertible into common shares of the Company or OP Units, nor are these joint venture partners entitled to receive distributions that holders of common shares of the Company receive.

Common Share Capitalization

Common Share Capitalization	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Common Share Capitalization	Common Share Capitalization During the years ended December 31, 2017 , 2016, and 2015, the Board of Directors authorized dividends totaling $1.76 per share, $1.95 per share, and $2.45 per share, respectively. Total dividends paid during the years ended December 31, 2017 , 2016, and 2015 were $57.6 million , $65.1 million , and $83.5 million respectively. The following table summarizes issuance, repurchase, and other activity with respect to the Company's common shares for the years ended December 31, 2017 , 2016, and 2015: Year Ended December 31, 2017 Year Ended December 31, 2016 Year Ended December 31, 2015 Common Shares Outstanding (12/31/2016, 12/31/2015, and 12/31/2014, respectively) 32,294,703 33,126,012 33,449,678 Share Activity: Shares repurchased (961,566 ) (833,784 ) (325,613 ) Director LTIP Units exercised 2,801 2,475 1,947 Common Shares Outstanding (12/31/2017, 12/31/2016, and 12/31/2015, respectively) 31,335,938 32,294,703 33,126,012 If all LTIP and OP Units that have been previously issued were to become fully vested and exchanged for common shares as of December 31, 2017 , 2016, and 2015, the Company's issued and outstanding common shares would increase to 32,039,097 shares, 32,976,242 shares, and 33,787,950 shares, respectively. On March 6, 2017, the Company's Board of Directors approved the adoption of a share repurchase program under which the Company is authorized to repurchase up to 1.7 million common shares. The program, which is open-ended in duration, allows the Company to make repurchases from time to time on the open market or in negotiated transactions, including under Rule 10b5-1 plans. Repurchases are at the Company's discretion, subject to applicable law, share availability, price and its financial performance, among other considerations. This program supersedes the program that was previously adopted on August 3, 2015. During the year ended December 31, 2017 , the Company repurchased 961,566 shares at an average price per share of $15.23 and a total cost of $14.6 million .

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The components of the computation of basic and diluted EPS were as follows: Year Ended December 31, 2017 2016 2015 (In thousands except share amounts) Net increase (decrease) in shareholders' equity resulting from operations $ 33,981 $ (16,007 ) $ 38,089 Add: Net increase (decrease) in equity resulting from operations attributable to the participating non-controlling interest (1) 221 (101 ) 239 Net increase (decrease) in equity resulting from operations related to common shares, LTIP Unit holders, and participating non-controlling interest 34,202 (16,108 ) 38,328 Net increase (decrease) in shareholders' equity resulting from operations available to common share and LTIP Unit holders: Net increase (decrease) in shareholders' equity resulting from operations– common shares 33,487 (15,789 ) 37,604 Net increase (decrease) in shareholders' equity resulting from operations– LTIP Units 494 (218 ) 485 Dividends Paid (2) : Common shareholders (56,434 ) (63,855 ) (81,886 ) LTIP Unit holders (829 ) (880 ) (1,054 ) Non-controlling interest (373 ) (413 ) (520 ) Total dividends paid to common shareholders, LTIP Unit holders, and non-controlling interest (57,636 ) (65,148 ) (83,460 ) Undistributed (Distributed in excess of) earnings: Common shareholders (22,947 ) (79,644 ) (44,282 ) LTIP Unit holders (335 ) (1,098 ) (569 ) Non-controlling interest (152 ) (514 ) (281 ) Total undistributed (distributed in excess of) earnings attributable to common shareholders, LTIP Unit holders, and non-controlling interest $ (23,434 ) $ (81,256 ) $ (45,132 ) Weighted average shares outstanding (basic and diluted): Weighted average common shares outstanding 32,062,091 32,758,050 33,422,053 Weighted average participating LTIP Units 472,527 452,436 431,640 Weighted average non-controlling interest units 212,000 212,000 212,000 Basic earnings per common share: Distributed $ 1.76 $ 1.95 $ 2.45 Undistributed (Distributed in excess of) (0.72 ) (2.43 ) (1.32 ) $ 1.04 $ (0.48 ) $ 1.13 Diluted earnings per common share: Distributed $ 1.76 $ 1.95 $ 2.45 Undistributed (Distributed in excess of) (0.72 ) (2.43 ) (1.32 ) $ 1.04 $ (0.48 ) $ 1.13 (1) For the years ended December 31, 2017 , 2016, and 2015, excludes net increase in equity resulting from operations of $1.8 million , $0.4 million , and $0.1 million , respectively attributable to joint venture partners, which have non-participating interests as described in Note 11. (2) The Company pays quarterly dividends in arrears, so a portion of the dividends paid in each calendar year relate to the prior year's earnings.

Counterparty Risk

Counterparty Risk	12 Months Ended
	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Counterparty Risk	Counterparty Risk As of December 31, 2017 , investments with an aggregate value of approximately $1.41 billion were held with dealers as collateral for various reverse repurchase agreements. The investments held as collateral include securities in the amount of $10.6 million that were sold prior to period end but for which such sale had not yet settled as of December 31, 2017 . The following table details the percentage of such collateral held by counterparties who hold greater than 15% of the aggregate $1.41 billion in collateral for various reverse repurchase agreements as of December 31, 2017. In addition to the below, unencumbered investments, on a settlement date basis, of approximately $61.3 million were held in custody at the Bank of New York Mellon Corporation as of December 31, 2017. Dealer % of Total Collateral on Reverse Repurchase Agreements Royal Bank of Canada 18% The following table details the percentage of collateral amounts held by dealers who hold greater than 15% of the Company's Due from Brokers, included as of December 31, 2017 : Dealer % of Total Due from Brokers Morgan Stanley 35% BNP Paribas Securities Corp. 24% J.P. Morgan Securities LLC 17% The following table details the percentage of amounts held by dealers who hold greater than 15% of the Company's Receivable for securities sold as of December 31, 2017 : Dealer % of Total Receivable for Securities Sold Bank of America Securities 28% Nomura Securities International Inc. 26% In addition, the Company held cash and cash equivalents of $47.2 million and $123.3 million as of December 31, 2017 and 2016, respectively. The below table details the concentration of cash and cash equivalents held by each counterparty: As of Counterparty December 31, 2017 December 31, 2016 BlackRock Liquidity Funds FedFund Portfolio 56% 41% Bank of New York Mellon Corporation 37% 27% Deutsche Bank Securities 5% —% Bank of America Securities 2% —% Goldman Sachs Financial Square Funds—Government Fund —% 16% Morgan Stanley Institutional Liquidity Fund—Government Portfolio —% 16%

Restricted cash

Restricted cash	12 Months Ended
	Dec. 31, 2017
Restricted Cash and Investments [Abstract]
Restricted Cash Disclosure [Text Block]	Restricted Cash The Company is required to maintain certain cash balances with counterparties and/or unrelated third parties for various activities and transactions. In connection with a letter of credit with a mortgage originator in which the Company holds an equity interest, funds were deposited into an account for the benefit of the mortgage originator. This letter of credit was terminated in April 2017. Additionally, the Company is required to maintain a specific cash balance in a segregated account pursuant to a flow consumer loan purchase and sale agreement. The Company is also required to maintain specific minimum cash balances in connection with certain regulated subsidiaries, including its subsidiary that holds various state mortgage origination licenses. The below table details the Company's restricted cash balances included in Restricted cash on the Consolidated Statement of Assets, Liabilities, and Equity as of December 31, 2017 and 2016. December 31, 2017 December 31, 2016 (In thousands) Restricted cash balance related to: Minimum account balance required for regulatory purposes $ 250 $ 250 Letter of credit — 230 Flow consumer loan purchase and sale agreement 175 175 Total $ 425 $ 655

Offsetting of Assets and Liabil

Offsetting of Assets and Liabilities	12 Months Ended
	Dec. 31, 2017
Offsetting of Assets and Liabilities [Abstract]
Offsetting of Assets and Liabilities [Text Block]	Offsetting of Assets and Liabilities The Company records financial instruments at fair value as described in Note 2. All financial instruments are recorded on a gross basis on the Consolidated Statement of Assets, Liabilities, and Equity. In connection with the vast majority of its derivative, repurchase and reverse repurchase agreements, and the related trading agreements, the Company and its counterparties are required to pledge collateral. Cash or other collateral is exchanged as required with each of the Company's counterparties in connection with open derivative positions, and repurchase and reverse repurchase agreements. The following tables present information about certain assets and liabilities representing financial instruments as of December 31, 2017 and 2016. The Company has not entered into master netting agreements with any of its counterparties. Certain of the Company's repurchase and reverse repurchase agreements and financial derivative transactions are governed by underlying agreements that generally provide a right of offset in the event of default or in the event of a bankruptcy of either party to the transaction. December 31, 2017 : Description Amount of Assets (Liabilities) Presented in the Consolidated Statements of Assets, Liabilities, and Equity (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets Financial derivatives–assets $ 28,165 $ (18,708 ) $ — $ (1,720 ) $ 7,737 Repurchase agreements 155,949 (155,949 ) — — — Liabilities Financial derivatives–liabilities (36,273 ) 18,708 — 17,565 — Reverse repurchase agreements (1,209,315 ) 155,949 1,034,808 18,558 — December 31, 2016: Description Amount of Assets (Liabilities) Presented in the Consolidated Statements of Assets, Liabilities, and Equity (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets Financial derivatives–assets $ 35,595 $ (15,082 ) $ — $ (7,933 ) $ 12,580 Repurchase agreements 184,819 (184,819 ) — — — Liabilities Financial derivatives–liabilities (18,687 ) 15,082 — 3,574 (31 ) Reverse repurchase agreements (1,033,581 ) 184,819 809,573 39,189 — (1) In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis. (2) For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore, the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's reverse repurchase agreements and cash collateral pledged on the Company's financial derivative liabilities. Total financial instruments transferred or pledged as collateral on the Company's reverse repurchase agreements as of December 31, 2017 and 2016 were $1.41 billion and $1.16 billion , respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $6.4 million and $14.9 million , respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $16.6 million and $14.8 million , respectively. (3) When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above tables, the Company has made assumptions in allocating pledged or posted collateral among the various rows.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Commitments and Contingencies The Company provides current directors and officers with a limited indemnification against liabilities arising in connection with the performance of their duties to the Company. In the normal course of business the Company may also enter into contracts that contain a variety of representations, warranties, and general indemnifications. The Company's maximum exposure under these arrangements, including future claims that may be made against the Company that have not yet occurred, is unknown. The Company has not incurred any costs to defend lawsuits or settle claims related to these indemnification agreements. The Company has no liabilities recorded for these agreements as of December 31, 2017 and 2016. Commitments and Contingencies Related to Investments in Mortgage Originators In connection with certain of its investments in mortgage originators, the Company has outstanding commitments and contingencies as described below. As described in Note 9, Related Party Transactions, the Company is party to a flow mortgage loan purchase and sale agreement with a mortgage originator. The Company has entered into two agreements whereby it guarantees the performance of this mortgage originator under master repurchase agreements. The Company's maximum guarantees are capped at $30.0 million . As of December 31, 2017 the mortgage originator had $21.2 million outstanding borrowings under these agreements guaranteed by the Company. The Company's obligation under these arrangements are deemed to be guarantees under ASC 460-10 and are carried at fair value and included in Other Liabilities on the Consolidated Statement of Assets, Liabilities, and Equity. As of December 31, 2017 the estimated fair value of such guarantees was zero . As of December 31, 2017, in connection with its equity investment in another mortgage originator as referenced in Note 9, Related Party Transactions, the Company had a commitment to invest an additional $2.5 million .

Financial Highlights

Financial Highlights	12 Months Ended
	Dec. 31, 2017
Investment Company, Financial Highlights [Abstract]
Financial Highlights [Text Block]	Financial Highlights Results of Operations for a Share Outstanding Throughout the Periods: Year Ended December 31, 2017 2016 2015 Beginning Shareholders' Equity Per Share (12/31/2016, 12/31/2015, and 12/31/2014, respectively) $ 19.75 $ 22.10 $ 23.38 Net Investment Income 1.10 1.09 1.98 Net Realized/Unrealized Gains (Losses) 0.02 (1.57 ) (0.83 ) Results of Operations Attributable to Equity 1.12 (0.48 ) 1.15 Less: Results of Operations Attributable to Non-controlling Interests (0.06 ) (0.01 ) (0.01 ) Results of Operations Attributable to Shareholders' Equity (1) 1.06 (0.49 ) 1.14 Dividends Paid to Common Shareholders (1.76 ) (1.95 ) (2.45 ) Weighted Average Share Impact on Dividends Paid (2) (0.04 ) (0.04 ) (0.05 ) Accretive (Dilutive) Effect of Share Issuances (Net of Offering Costs), Share Repurchases, and Adjustments to Non-controlling Interest 0.14 0.13 0.08 Ending Shareholders' Equity Per Share (12/31/2017, 12/31/2016, and 12/31/2015, respectively) (3) $ 19.15 $ 19.75 $ 22.10 Shares Outstanding, end of period 31,335,938 32,294,703 33,126,012 (1) Calculated based on average common shares outstanding and can differ from the calculation for EPS (See Note 13). (2) Per share impact on dividends paid relating to share issuances/repurchases during the period as well as dividends paid to LTIP and OP Unit holders. (3) If all LTIP Units and OP Units previously issued were vested and exchanged for common shares as of December 31, 2017 , 2016, and 2015, shareholders' equity per share would be $18.85, $19.46, and $21.80, respectively. Total Return: The Company calculates its total return two ways, one based on its reported net asset value and the other based on its publicly traded share price. The following table illustrates the Company's total return for the periods presented based on net asset value: Net Asset Value Based Total Return for a Shareholder: (1) Year Ended December 31, 2017 2016 2015 Total Return 6.14% (1.83)% 5.14% (1) Total return is calculated assuming reinvestment of distributions at shareholders' equity per share during the period. Market Based Total Return for a Shareholder: For the years ended December 31, 2017 , 2016, and 2015, the Company's market based total return based on the closing price as reported by the New York Stock Exchange was 4.35% , 3.50% , and (4.56)% , respectively. Calculation of market based total return assumes the reinvestment of dividends at the closing price as reported by the New York Stock Exchange as of the ex-date. Net Investment Income Ratio to Average Equity: (1) Year Ended December 31, 2017 2016 2015 Net Investment Income 5.51% 5.22% 8.59% (1) Average equity is calculated using month end values. Expense Ratios to Average Equity: (1) Year Ended December 31, 2017 2016 2015 Operating expenses, before interest expense and other investment related expenses (2.81)% (2.93)% (2.69)% Interest expense and other investment related expenses (6.41)% (3.56)% (2.30)% Total Expenses (9.22)% (6.49)% (4.99)% (1) Average equity is calculated using month end values.

Condensed Quarterly Financial D

Condensed Quarterly Financial Data (Unaudited) (Notes)	12 Months Ended
	Dec. 31, 2017
Condensed Quarterly Financial Data (Unaudited) [Abstract]
Quarterly Financial Information [Text Block]	Condensed Quarterly Financial Data (Unaudited) Detailed below is unaudited quarterly financial data for the years ended December 31, 2017 and 2016. Three Month Period Ended March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 (In thousands except per share amounts) INVESTMENT INCOME Interest income $ 22,886 $ 21,788 $ 21,145 $ 23,810 Other income 939 872 1,232 1,288 Total investment income 23,825 22,660 22,377 25,098 EXPENSES Base management fee to affiliate (1) 2,410 2,372 2,161 2,113 Interest expense 6,003 7,625 8,166 9,326 Other investment related expenses 1,521 2,058 1,908 4,267 Other operating expenses 2,116 2,173 2,240 2,333 Total expenses 12,050 14,228 14,475 18,039 NET INVESTMENT INCOME 11,775 8,432 7,902 7,059 NET REALIZED AND CHANGE IN NET UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY TRANSACTIONS/TRANSLATION Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions (831 ) (5,347 ) 1,205 (5,831 ) Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation 4,786 2,356 (2,512 ) 6,970 NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY 3,955 (2,991 ) (1,307 ) 1,139 NET INCREASE (DECREASE) IN EQUITY RESULTING FROM OPERATIONS 15,730 5,441 6,595 8,198 LESS: NET INCREASE IN EQUITY RESULTING FROM OPERATIONS ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 452 377 400 754 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS $ 15,278 $ 5,064 $ 6,195 $ 7,444 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS PER SHARE: Basic and Diluted (2) $ 0.47 $ 0.16 $ 0.19 $ 0.23 (1) Net of management fee rebate of $0.2 million for the each of the three month periods ended September 30, 2017 and December 31, 2017, respectively. See Note 9 for further details on management fee rebates. (2) For the year ended December 31, 2017 the sum of EPS for the four quarters of the year does not equal EPS as calculated for the entire year (see Note 13) as a result of changes in shares during the year due to repurchases of common share, as EPS is calculated using average shares outstanding during the period. Three Month Period Ended March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016 (In thousands except per share amounts) INVESTMENT INCOME Interest income $ 20,427 $ 18,990 $ 16,662 $ 18,265 Other income 1,668 1,024 807 2,342 Total investment income 22,095 20,014 17,469 20,607 EXPENSES Base management fee to affiliate 2,611 2,553 2,485 2,416 Interest expense 3,468 4,234 4,143 4,461 Other investment related expenses 1,749 2,191 2,068 2,062 Other operating expenses 2,445 2,515 2,379 2,640 Total expenses 10,273 11,493 11,075 11,579 NET INVESTMENT INCOME 11,822 8,521 6,394 9,028 NET REALIZED AND CHANGE IN NET UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY TRANSACTIONS/TRANSLATION Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions (11,940 ) (2,331 ) (23,020 ) (2,242 ) Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation (23,068 ) (1,188 ) 17,176 (4,854 ) NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY (35,008 ) (3,519 ) (5,844 ) (7,096 ) NET INCREASE (DECREASE) IN EQUITY RESULTING FROM OPERATIONS (23,186 ) 5,002 550 1,932 LESS: NET INCREASE IN EQUITY RESULTING FROM OPERATIONS ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 14 17 34 240 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS $ (23,200 ) $ 4,985 $ 516 $ 1,692 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS PER SHARE: Basic and Diluted $ (0.69 ) $ 0.15 $ 0.02 $ 0.05

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 6, 2018, the Company's Board of Directors approved a dividend for the fourth quarter of 2017 in the amount of $0.41 per share payable on March 15, 2018 to shareholders of record as of March 1, 2018. In addition, on February 6, 2018, the Company's Board of Directors also approved the adoption of a share repurchase program under which the Company is authorized to repurchase up to 1.55 million common shares. The program, which is open-ended in duration, allows the Company to make repurchases from time to time on the open market or in negotiated transactions, including under 10b5-1 plans. Repurchases are at the Company's discretion, subject to applicable law, share availability, price and its financial performance, among other considerations. This program supersedes the previous program that was approved on March 6, 2017. From the adoption of the program on February 6, 2018 through March 9, 2018, the Company has repurchased 371,705 shares for an aggregate cost of $5.5 million .

Significant Accounting Polici34

Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2017
Investment Holdings [Line Items]
Basis of Presentation	Basis of Presentation : The Company's consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States of America, or "U.S. GAAP," for investment companies, ASC 946, Financial Services—Investment Companies ("ASC 946"). The Company has determined that it meets the definition of an investment company under ASC 946 . ASC 946 requires, among other things, that investments be reported at fair value in the financial statements. Additionally under ASC 946 the Company generally will not consolidate its interest in any company other than in its subsidiaries that qualify as investment companies under ASC 946. The consolidated financial statements include the accounts of the Company, the Operating Partnership, and its subsidiaries. They also include certain securitization trusts which are designed to facilitate specific financing activities of the Company and represent a direct extension of the Company's business activities. All intercompany balances and transactions have been eliminated. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Valuation	Valuation : The Company applies ASC 820-10, Fair Value Measurement ("ASC 820-10"), to its holdings of financial instruments. ASC 820-10 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the observability of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1—inputs to the valuation methodology are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Currently, the types of financial instruments the Company generally includes in this category are listed equities, exchange-traded derivatives, and cash equivalents; • Level 2—inputs to the valuation methodology other than quoted prices included in Level 1 are observable for the asset or liability, either directly or indirectly. Currently, the types of financial instruments that the Company generally includes in this category are Agency RMBS, U.S. Treasury securities and sovereign debt, certain non-Agency RMBS and CMBS, CLOs, and corporate debt, and actively traded derivatives, such as interest rate swaps and foreign currency forwards, and certain other over-the-counter derivatives; and • Level 3—inputs to the valuation methodology are unobservable and significant to the fair value measurement. The types of financial instruments that the Company generally includes in this category are certain RMBS, CMBS, and CLOs; ABS, credit default swaps, or "CDS," on individual ABS, distressed corporate debt, and total return swaps on distressed corporate debt, in each case where there is less price transparency. Also included in this category are residential and commercial mortgage loans, consumer loans, non-listed equities, private corporate debt and equity investments, and Other secured borrowings, at fair value. For certain financial instruments, the various inputs that management uses to measure fair value for such financial instrument may fall into different levels of the fair value hierarchy. In such cases, the determination of which category within the fair value hierarchy is appropriate for such financial instrument is based on the lowest level of input that is significant to the fair value measurement. ASC 820 prioritizes the various inputs that management uses to measure fair value with the highest priority to inputs that are observable and reflect quoted prices (unadjusted) for identical assets or liabilities in active markets (Level 1) and the lowest priority to inputs that are unobservable and significant to the fair value measurement (Level 3). The assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the financial instrument. The Company may use valuation techniques consistent with the market and income approaches to measure the fair value of its assets and liabilities. The market approach uses third-party valuations and information obtained from market transactions involving identical or similar assets or liabilities. The income approach uses projections of the future economic benefit of an instrument to determine its fair value, such as in the discounted cash flow methodology. The inputs or methodology used for valuing financial instruments are not necessarily an indication of the risk associated with investing in these financial instruments. The leveling of each financial instrument is reassessed at the end of each period. Transfers between levels of the fair value hierarchy are assumed to occur at the end of the reporting period. Summary Valuation Techniques For financial instruments that are traded in an "active market," the best measure of fair value is the quoted market price. However, many of the Company's financial instruments are not traded in an active market. Therefore, management generally uses third-party valuations when available. If third-party valuations are not available, management uses other valuation techniques, such as the discounted cash flow methodology. The following are summary descriptions, for various categories of financial instruments, of the valuation methodologies management uses in determining fair value of the Company's financial instruments in such categories. Management utilizes such methodologies to assign a good faith fair value (the estimated price that, in an orderly transaction at the valuation date, would be received to sell an asset, or paid to transfer a liability, as the case may be) to each such financial instrument. For mortgage-backed securities, or "MBS," including To Be Announced MBS, or "TBAs," CLOs, and distressed and non-distressed corporate debt and equity, management seeks to obtain at least one third-party valuation, and often obtains multiple valuations when available. Management has been able to obtain third-party valuations on the vast majority of these instruments and expects to continue to solicit third-party valuations in the future. Management generally values each financial instrument at the average of third-party valuations received and not rejected as described below. Third-party valuations are not binding, and while management generally does not adjust the valuations it receives, management may challenge or reject a valuation when, based on its validation criteria, management determines that such valuation is unreasonable or erroneous. Furthermore, based on its validation criteria, management may determine that the average of the third-party valuations received for a given instrument does not result in what management believes to be the fair value of such instrument, and in such circumstances management may override this average with its own good faith valuation. The validation criteria may take into account output from management's own models, recent trading activity in the same or similar instruments, and valuations received from third parties. The use of proprietary models requires the use of a significant amount of judgment and the application of various assumptions including, but not limited to, assumptions concerning future prepayment rates and default rates. Valuations for fixed-rate RMBS pass-throughs issued by a U.S. government agency or government-sponsored enterprise are typically based on observable pay-up data (pay-ups are price premiums for specified categories of fixed-rate pools relative to their TBA counterparts) or models that use observable market data, such as interest rates and historical prepayment speeds, and are validated against third-party valuations. Given their relatively high level of price transparency, Agency RMBS pass-throughs are typically designated as Level 2 assets. Non-Agency MBS, Agency interest only and inverse interest only RMBS, and CLOs are generally classified as either Level 2 or Level 3 based on analysis of available market data and/or third-party valuations. The Company's investments in distressed corporate debt can be in the form of loans as well as total return swaps on loans. These investments, as well as related non-listed equity investments, are generally designated as Level 3 assets. Valuations for total return swaps are typically based on prices of the underlying loans received from widely used third-party pricing services. Investments in non-distressed corporate bonds are generally also valued based on prices received from third-party pricing services, and many of these bonds, because they are very liquid with readily observable data, are generally classified as Level 2 holdings. Furthermore, the methodology used by the third-party valuation providers is reviewed at least annually by management, so as to ascertain whether such providers are utilizing observable market data to determine the valuations that they provide. For residential and commercial mortgage loans, consumer loans, and real estate owned properties, or "REO," management determines fair value by taking into account both external pricing data, when available, and internal pricing models. Non-performing mortgage loans and REO are typically valued based on management's estimates of the value of the underlying real estate, using information including general economic data, broker price opinions, or "BPOs," recent sales, property appraisals, and bids. Performing mortgage loans and consumer loans are typically valued using discounted cash flows based on market assumptions. Cash flow assumptions typically include projected default and prepayment rates and loss severities, and may include adjustments based on appraisals and BPOs. Mortgage and consumer loans and REO properties are classified as Level 3 assets. Securitized mortgage loans that are not deemed "qualified mortgage," or "QM," loans under the rules of the Consumer Financial Protection Bureau, or "non-QM loans," are held as part of a collateralized financing entity, or "CFE." A CFE is a variable interest entity, or "VIE," that holds financial assets, issues beneficial interests in those assets, and has no more than nominal equity, and for which the issued beneficial interests have contractual recourse only to the related assets of the CFE. ASC 810, Consolidation ("ASC 810"), allows the Company to elect to measure both the financial assets and financial liabilities of the CFE using the more observable of the fair value of the financial assets and the fair value of the financial liabilities of the CFE. The Company has elected the fair value option for initial and subsequent recognition of the debt issued by its consolidated securitization trusts and has determined such trust meets the definition of a CFE; see Note 6 for further discussion on the Company's securitization trusts. The Company has determined the inputs to the fair value measurement of the financial liabilities of its CFE to be more observable than those of the financial assets and, as a result, has used the fair value of the financial liabilities of the CFE to measure the fair value of the financial assets of the CFE. The fair value of the debt issued by the CFE is typically valued using discounted cash flows and other market data. The securitized non-QM loans, which are assets of the CFE, are included in Investments, at fair value on the Company's Consolidated Statement of Assets, Liabilities, and Equity. The debt issued by the CFE is included in Other secured borrowings, at fair value, on the Company's Consolidated Statement of Assets, Liabilities, and Equity. The securitized non-QM loans and the debt issued by the Company's CFE are both designated as Level 3 financial instruments. For financial derivatives with greater price transparency, such as CDS on asset-backed indices, CDS on corporate indices, certain options on the foregoing, and total return swaps on publicly traded equities, market-standard pricing sources are used to obtain valuations; these financial derivatives are generally designated as Level 2 instruments. Interest rate swaps, swaptions, and foreign currency forwards are typically valued based on internal models that use observable market data, including applicable interest rates and foreign currency rates in effect as of the measurement date; the model-generated valuations are then typically compared to counterparty valuations for reasonableness. These financial derivatives are also generally designated as Level 2 instruments. Financial derivatives with less price transparency, such as CDS on individual ABS, are generally valued based on internal models, and are typically designated as Level 3 instruments. In the case of CDS on individual ABS, the valuation process typically starts with an estimation of the value of the underlying ABS. In valuing its derivatives, the Company also considers the creditworthiness of both the Company and its counterparties, along with collateral provisions contained in each derivative agreement. Investments in private operating entities, such as mortgage originators, are valued based on available metrics, such as relevant market multiples and comparable company valuations, company specific-financial data including actual and projected results and independent third party valuation estimates. These investments are designated as Level 3 assets. The Company's repurchase agreements are carried at fair value based on their contractual amounts as the debt is short-term in nature. The Company's reverse repurchase agreements are carried at cost, which approximates fair value. Repurchase and reverse repurchase agreements are classified as Level 2 assets and liabilities based on the adequacy of the collateral and their short term nature. The Company's valuation process, including the application of validation criteria, is overseen by the Manager's Valuation Committee ("Valuation Committee"). The Valuation Committee includes senior level executives from various departments within the Manager, and each quarter, the Valuation Committee reviews and approves the valuations of the Company's investments. The valuation process also includes a monthly review by the Company's third-party administrator. The goal of this review is to replicate various aspects of the Company's valuation process based on the Company's documented procedures. Because of the inherent uncertainty of valuation, the estimated fair value of the Company's financial instruments may differ significantly from the values that would have been used had a ready market for the financial instruments existed, and the differences could be material to the Company's consolidated financial statements.
Purchase and Sales of Investments and Investment Income	Purchase and Sales of Investments and Investment Income : Purchases and sales of investments are generally recorded on trade date, and realized and unrealized gains and losses are calculated based on identified cost. The Company amortizes premiums and accretes discounts on its debt investments. Coupon interest income on fixed-income investments is generally accrued based on the outstanding principal balance or notional value and the current coupon interest rate. For Agency RMBS and debt securities that are deemed to be of high credit quality at the time of purchase, premiums and discounts are amortized into interest income over the life of such securities using the effective interest method. For securities whose cash flows vary depending on prepayments, an effective yield retroactive to the time of purchase is periodically recomputed based on actual prepayments and changes in projected prepayment activity, and a catch-up adjustment is made to amortization to reflect the cumulative impact of the change in effective yield. For debt securities (including non-Agency MBS) that are deemed not to be of high credit quality at the time of purchase, interest income is recognized based on the effective interest method. For purposes of determining the effective interest rate, management estimates the future expected cash flows of its investment holdings based on assumptions including, but not limited to, assumptions for future prepayment rates, default rates, and loss severities (each of which may in turn incorporate various macro-economic assumptions, such as future housing prices). These assumptions are re-evaluated not less than quarterly. Principal write-offs are generally treated as realized losses. Changes in projected cash flows, as applied to the current amortized cost of the security, may result in a prospective change in the yield/interest income recognized on such securities. For each loan purchased with the expectation that both interest and principal will be paid in full, the Company generally amortizes or accretes any premium or discount over the life of the loan utilizing the effective interest method. However, on at least a quarterly basis based on current information and events, the Company re-assesses the collectability of interest and principal, and designates a loan as impaired either when any payments have become 90 or more days past due, or when, in the opinion of management, it is probable that the Company will be unable to collect either interest or principal in full. Once a loan is designated as impaired, as long as principal is still expected to be collectable in full, interest payments are recorded as interest income only when received (i.e., under the cash basis method); accruals of interest income are only resumed when the loan becomes contractually current and performance is demonstrated to be resumed. However, if principal is not expected to be collectable in full, the cost recovery method is used (i.e., no interest income is recognized, and all payments received—whether contractually interest or principal—are applied to cost). For each loan purchased with evidence of credit deterioration since origination and the expectation that either principal or interest will not be paid in full, interest income is generally recognized using the effective interest method for as long as the cash flows can be reasonably estimated. Here, instead of amortizing the purchase discount (i.e., the excess of the unpaid principal balance over the purchase price) over the life of the loan, the Company effectively amortizes the accretable yield (i.e., the excess of the Company's estimate of the total cash flows to be collected over the life of the loan over the purchase price). Not less than quarterly, the Company updates its estimate of the cash flows expected to be collected over the life of the loan, and revised yields are prospectively applied. To the extent that cash flows cannot be reasonably estimated, these loans are generally accounted for under the cost recovery method. For certain groups of consumer loans that the Company considers as having sufficiently homogeneous characteristics, the Company aggregates such loans into pools, and accounts for each such pool as a single asset. The pool is then treated analogously to a debt security deemed not to be of high credit quality, in that (i) the aggregate premium or discount for the pool is amortized or accreted into interest income based on the pool's effective interest rate; (ii) the effective interest rate is determined based on the net expected cash flows of the pool, taking into account estimates of prepayments, defaults, and loss severities; and (iii) estimates are updated not less than quarterly and revised yields are prospectively applied. In estimating future cash flows on the Company's debt investments, there are a number of assumptions that will be subject to significant uncertainties and contingencies, including, in the case of MBS, assumptions relating to prepayment rates, default rates, loan loss severities, and loan repurchases. These estimates require the use of a significant amount of judgment. The Company receives dividend income on certain of its equity investments and rental income on certain of its REO properties. These items of income are included on the Consolidated Statement of Operations in, "Other income."
Cash and Cash Equivalents	Cash and Cash Equivalents : Cash and cash equivalents include cash and short term investments with original maturities of three months or less at the date of acquisition. Cash and cash equivalents typically include amounts held in an interest bearing overnight account and amounts held in money market funds, and these balances generally exceed insured limits. The Company holds its cash at institutions that it believes to be highly creditworthy. Restricted cash represents cash that the Company can use only for specific purposes. The Company's investments in money market funds are included in the Consolidated Condensed Schedule of Investments. See Note 15 for further discussion of restricted cash balances.
Financial Derivatives	Financial Derivatives : The Company enters into various types of financial derivatives. The Company's financial derivatives are predominantly subject to bilateral collateral arrangements or clearing in accordance with the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010. The Company may be required to deliver or receive cash or securities as collateral upon entering into derivative transactions. In addition, changes in the relative value of derivative transactions may require the Company or the counterparty to post or receive additional collateral. In the case of cleared derivatives, the clearinghouse becomes the Company's counterparty and a futures commission merchant acts as an intermediary between the Company and the clearinghouse with respect to all facets of the related transaction, including the posting and receipt of required collateral. Cash collateral received by the Company is reflected on the Consolidated Statement of Assets, Liabilities, and Equity as "Due to Brokers." Conversely, cash collateral posted by the Company is reflected as "Due from Brokers" on the Consolidated Statement of Assets, Liabilities, and Equity. The major types of derivatives utilized by the Company are swaps, futures, options, and forwards. Swaps : The Company may enter into various types of swaps, including interest rate swaps, credit default swaps, and total return swaps. The primary risk associated with the Company's interest rate swap activity is interest rate risk. The primary risk associated with the Company's credit default swaps is credit risk and the primary risks associated with the Company's total return swap activity are equity market risk and credit risk. The Company is subject to interest rate risk exposure in the normal course of pursuing its investment objectives. Primarily to help mitigate interest rate risk, the Company enters into interest rate swaps. Interest rate swaps are contractual agreements whereby one party pays a floating interest rate on a notional principal amount and receives a fixed-rate payment on the same notional principal, or vice versa, for a fixed period of time. Interest rate swaps change in value with movements in interest rates. The Company enters into credit default swaps. A credit default swap is a contract under which one party agrees to compensate another party for the financial loss associated with the occurrence of a "credit event" in relation to a "reference amount" or notional value of a credit obligation (usually a bond, loan, or a basket of bonds or loans). The definition of a credit event may vary from contract to contract. A credit event may occur (i) when the underlying reference asset(s) fails to make scheduled principal or interest payments to its holders, (ii) with respect to credit default swaps referencing mortgage/asset-backed securities and indices, when the underlying reference obligation is downgraded below a certain rating level, or (iii) with respect to credit default swaps referencing corporate entities and indices, upon the bankruptcy of the underlying reference obligor. The Company typically writes (sells) protection to take a "long" position or purchases (buys) protection to take a "short" position with respect to underlying reference assets or to hedge exposure to other investment holdings. The Company enters into total return swaps in order to take a "long" or "short" position with respect to an underlying reference asset. The Company is subject to market price volatility of the underlying reference asset. A total return swap involves commitments to pay interest in exchange for a market-linked return based on a notional value. To the extent that the total return of the corporate debt, security, group of securities or index underlying the transaction exceeds or falls short of the offsetting interest obligation, the Company will receive a payment from or make a payment to the counterparty. Swaps change in value with movements in interest rates, credit quality, or total return of the reference securities. During the term of swap contracts, changes in value are recognized as unrealized gains or losses. When a contract is terminated, the Company realizes a gain or loss equal to the difference between the proceeds from (or cost of) the closing transaction and the Company's basis in the contract, if any. Periodic payments or receipts required by swap agreements are recorded as unrealized gains or losses when accrued and realized gains or losses when received or paid. Upfront payments paid and/or received by the Company to open swap contracts are recorded as an asset and/or liability on the Consolidated Statement of Assets, Liabilities, and Equity and are recorded as a realized gain or loss on the termination date. Futures Contracts : A futures contract is an exchange-traded agreement to buy or sell an asset for a set price on a future date. The Company enters into Eurodollar and/or U.S. Treasury security futures contracts to hedge its interest rate risk. The Company may also enter into various other futures contracts, including equity index futures and foreign currency futures. Initial margin deposits are made upon entering into futures contracts and can generally be either in the form of cash or securities. During the period the futures contract is open, changes in the value of the contract are recognized as unrealized gains or losses by marking-to-market to reflect the current market value of the contract. Variation margin payments are made or received periodically, depending upon whether unrealized losses or gains are incurred. When the contract is closed, the Company records a realized gain or loss equal to the difference between the proceeds of the closing transaction and the Company's basis in the contract. Options : The Company may purchase or write put or call options contracts or enter into swaptions. The Company enters into options contracts typically to help mitigate overall market, credit, or interest rate risk depending on the type of options contract. However, the Company also enters into options contracts from time to time for speculative purposes. When the Company purchases an options contract, the option asset is initially recorded at an amount equal to the premium paid, if any, and is subsequently marked-to-market. Premiums paid for purchasing options contracts that expire unexercised are recognized on the expiration date as realized losses. If an options contract is exercised, the premium paid is subtracted from the proceeds of the sale or added to the cost of the purchase to determine whether the Company has realized a gain or loss on the related transaction. When the Company writes an options contract, the option liability is initially recorded at an amount equal to the premium received, if any, and is subsequently marked-to-market. Premiums received for writing options contracts that expire unexercised are recognized on the expiration date as realized gains. If an options contract is exercised, the premium received is subtracted from the cost of the purchase or added to the proceeds of the sale to determine whether the Company has realized a gain or loss on the related investment transaction. When the Company enters into a closing transaction, the Company will realize a gain or loss depending upon whether the amount from the closing transaction is greater or less than the premiums paid or received. The Company may also enter into options contracts that contain forward-settling premiums. In this case, no money is exchanged upfront. Instead the agreed-upon premium is paid by the buyer upon expiration of the option, regardless of whether or not the option is exercised. Forward Currency Contracts : A forward currency contract is an agreement between two parties to purchase or sell a specific quantity of currency with the delivery and settlement at a specific future date and exchange rate. During the period the forward currency contract is open, changes in the value of the contract are recognized as unrealized gains or losses. When the contract is settled, the Company records a realized gain or loss equal to the difference between the proceeds of the closing transaction and the Company's basis in the contract. Commitments to Purchase Residential Mortgage Loans : The Company has entered into forward purchase commitments under flow agreements, whereby the Company commits to purchasing the loans based on pre-defined underwriting guidelines and at stated interest rates. Actual loan purchases are contingent upon successful loan closings. These commitments to purchase mortgage loans are classified as derivatives on the Company's Consolidated Statement of Assets, Liabilities, and Equity and are, therefore, recorded as assets or liabilities measured at fair value. Until the purchase commitment expires or the underlying loan closes, changes in the estimated fair value of such commitments are recognized as unrealized gains or losses in the Consolidated Statement of Operations. Financial derivatives disclosed on the Consolidated Condensed Schedule of Investments include: credit default swaps on asset-backed securities, credit default swaps on asset-backed indices, credit default swaps on corporate bond indices, credit default swaps on corporate bonds, interest rate swaps, total return swaps, futures contracts, foreign currency forwards, options contracts, warrants, and mortgage loan purchase commitments. Financial derivative assets are included in Financial derivatives—assets, at fair value on the Consolidated Statement of Assets, Liabilities, and Equity. Financial derivative liabilities are included in Financial derivatives—liabilities, at fair value on the Consolidated Statement of Assets, Liabilities, and Equity. In addition, financial derivative contracts are summarized by type on the Consolidated Condensed Schedule of Investments.
Investments Sold Short	Investments Sold Short : When the Company sells securities short, it typically satisfies its security delivery settlement obligation by obtaining the security sold short from the same or a different counterparty. The Company generally is required to deliver cash or securities as collateral to the counterparty for the Company's obligation to return the borrowed security. The amount by which the market value of the obligation falls short of or exceeds the proceeds from the short sale is treated as an unrealized gain or loss, respectively. A realized gain or loss will be recognized upon the termination of a short sale if the market price is less or greater than the proceeds originally received.
Transfers of Financial Assets	Transfers of Financial Assets : The Company enters into transactions whereby it transfers financial assets to third parties. Upon such a transfer of financial assets, the Company will sometimes retain or acquire interests in the related assets. The Company evaluates transferred assets pursuant to ASC 860-10, Transfers of Financial Assets , or "ASC 860-10," which requires that a determination be made as to whether a transferor has surrendered control over transferred financial assets. That determination must consider the transferor's continuing involvement in the transferred financial asset, including all arrangements or agreements made contemporaneously with, or in contemplation of, the transfer, even if they were not entered into at the time of the transfer. When a transfer of financial assets does not qualify as a sale, ASC 860-10 requires the transfer to be accounted for as a secured borrowing with a pledge of collateral. ASC 860-10 is a standard that requires the Company to exercise significant judgment in determining whether a transaction should be recorded as a "sale" or a "financing."
When-Issued/Delayed Delivery Securities	When-Issued/Delayed Delivery Securities : The Company may purchase or sell securities on a when-issued or delayed delivery basis. Securities purchased or sold on a when-issued basis are traded for delivery beyond the normal settlement date at a stated price or yield, and no income accrues to the purchaser prior to settlement. Purchasing or selling securities on a when-issued or delayed delivery basis involves the risk that the market price or yield at the time of settlement may be lower or higher than the agreed-upon price or yield, in which case a realized loss may be incurred. The Company transacts in the forward settling TBA market. The Company typically does not take delivery of TBAs, but rather settles the associated receivable and payable with its trading counterparties on a net basis. Transactions with the same counterparty for the same TBA that result in a reduction of the position are treated as extinguished. The market value of the securities that the Company is required to purchase pursuant to a TBA transaction may decline below the agreed-upon purchase price. Conversely, the market value of the securities that the Company is required to sell pursuant to a TBA transaction may increase above the agreed upon sale price. As part of its TBA activities, the Company may "roll" its TBA positions, whereby the Company may sell (buy) securities for delivery (receipt) in an earlier month and simultaneously contract to repurchase (sell) similar, but not identical, securities at an agreed-upon price on a fixed date in a later month (with the later-month price typically lower than the earlier-month price). The Company accounts for its TBA transactions (including those related to TBA rolls) as purchases and sales.
REO	REO : When the Company obtains possession of real property in connection with a foreclosure or similar action, the Company de-recognizes the associated mortgage loan according to ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure ("ASU 2014-04"). Under the provisions of ASU 2014-04, the Company is deemed to have received physical possession of real estate property collateralizing a mortgage loan when it obtains legal title to the property upon completion of a foreclosure or when the borrower conveys all interest in the property to it through a deed in lieu of foreclosure or similar legal agreement. The Company holds all REO at fair value.
Investments in Operating Entities	Investments in Operating Entities : The Company has made and may in the future make non-controlling investments in operating entities such as mortgage originators. Investments in such operating entities may be in the form of preferred and/or common equity, debt, or some other form of investment. The Company carries its investments in such entities at fair value. In cases where the operating entity provides services to the Company, the Company is required to use the equity method of accounting.
Variable Interest Entities	Variable Interest Entities : VIEs are entities in which: (i) the equity investors do not have the characteristics of a controlling financial interest, or (ii) there is insufficient equity to permit the entity to finance its activities without additional subordinated financial support from other parties. The Company holds beneficial interests in securitization trusts that are considered VIEs. The beneficial interests in these securitization trusts are represented by certificates issued by the trusts. The securitization trusts have been structured as pass-through entities that receive principal and interest payments on the underlying collateral and distribute those payments to the certificate holders, which include both third-party investors and the Company. The certificates held by the Company typically include some or all of the most subordinated tranches. The assets held by the trusts are restricted in that they can only be used to fulfill the obligations of the related trust. In certain cases the design and structure of the securitization trust is such that the Company effectively retains control of the assets as well as the activities that most significantly impact the economic performance of the trust; in such cases the trust is considered a direct extension of the Company's business, and the Company consolidates the trust. In cases where the Company does not effectively retain control of the assets of, or the activities that most significantly impact the economic performance of, the related trust, it does not consolidate the trust. See Note 6 for further discussion of the Company's securitization trusts.
Offering Costs/Underwriters' Discount	Offering Costs/Underwriters' Discount : Offering costs and underwriters' discount are charged against shareholders' equity. Offering costs typically include legal, accounting, printing, and other fees associated with the cost of raising capital.
Debt Issuance Costs	Debt Issuance Costs : Debt issuance costs associated with debt for which the Company has elected the fair value option are expensed at the issuance of the debt, and are included in Other investment related expenses on the Consolidated Statement of Operations. Costs associated with the issuance of debt for which the Company has not elected the fair value option are amortized over the life of the debt, which approximates the effective interest rate method, and are included in Interest expense on the Consolidated Statement of Operations. Deferred debt issuance costs are presented on the Consolidated Statement of Assets, Liabilities, and Equity as a direct deduction from the related debt liability, unless such deferred debt issuance costs are associated with borrowing facilities that are expected to have a future benefit, such as giving the Company the ability to access additional borrowings over the contractual term of the debt, in which case such deferred debt issuance costs are included in Other Assets on Consolidated Statement of Assets, Liabilities, and Equity. Debt issuance costs include legal and accounting fees, purchasers' or underwriters' discount, as well as other fees associated with the cost of the issuance of the related debt.
Expenses [Policy Text Block]	Expenses : Expenses are recognized as incurred on the Consolidated Statement of Operations.
Other Investment Related Expenses [Policy Text Block]	Other Investment Related Expenses : Other investment related expenses consist of expenses directly related to specific financial instruments. Such expenses generally include dividend expense on common stock sold short, servicing fees and corporate and escrow advances on mortgage and consumer loans, and various other expenses and fees related directly to the Company's financial instruments. Other investment related expenses are recognized as incurred on the Consolidated Statement of Operations; dividend expense on common stock sold short is recognized on the ex-dividend date.
LTIP Units	LTIP Units : Long term incentive plan units ("LTIP Units") have been issued to the Company's dedicated or partially dedicated personnel and independent directors as well as the Manager. Costs associated with LTIP Units issued to dedicated or partially dedicated personnel, or to independent directors, are measured as of the grant date based on the closing stock price on the New York Stock Exchange and are amortized over the vesting period in accordance with ASC 718-10, Compensation—Stock Compensation . The vesting periods for LTIP Units are typically one year from issuance for independent directors, and are typically one year to two years from issuance for dedicated or partially dedicated personnel.
Non-controlling interest	Non-controlling interests : Non-controlling interests include the interest in the Operating Partnership owned by an affiliate of the Manager and certain related parties and consist of units convertible into the Company's common shares. Non-controlling interests also include the interests of joint venture partners in certain of our consolidated subsidiaries. The joint venture partners' interests do not consist of units convertible into the Company's common shares. The Company adjusts the non-controlling interests owned by an affiliate of the Manager and certain related parties to align their carrying value with the share of total outstanding operating partnership units ("OP Units") issued by the Operating Partnership to the non-controlling interest. Any such adjustments are reflected in "Adjustment to non-controlling interest" on the Consolidated Statement of Changes in Equity. See Note 11 for further discussion of non-controlling interests.
Dividends	Dividends : Dividends payable by the Company are recorded on the ex-dividend date. Dividends are typically declared and paid on a quarterly basis in arrears.
Shares Repurchased	Shares Repurchased : Common shares that are repurchased by the Company subsequent to issuance are immediately retired upon settlement and decrease the total number of shares outstanding and issued.
Earnings Per Share ("EPS")	Earnings Per Share ("EPS") : Basic EPS is computed using the two class method by dividing net increase (decrease) in shareholders' equity resulting from operations after adjusting for the impact of LTIP Units which are participating securities, by the weighted average number of common shares outstanding calculated including LTIP Units. Because the Company's LTIP Units are participating securities, they are included in the calculation of basic and diluted EPS. OP Units relating to a non-controlling interest are also participating securities and, accordingly, are included in the calculation of both basic and diluted EPS.
Foreign Currency	Foreign Currency : Assets and liabilities denominated in foreign currencies are translated into U.S. dollars at current exchange rates at the following dates: (i) assets, liabilities, and unrealized gains/losses—at the valuation date; and (ii) income, expenses, and realized gains/losses—at the accrual/transaction date. The Company isolates the portion of realized and change in unrealized gain (loss) resulting from changes in foreign currency exchange rates on investments and financial derivatives from the fluctuations arising from changes in fair value of investments and financial derivatives held. Changes in realized and change in unrealized gain (loss) due to foreign currency are included in Foreign currency transactions and Foreign currency translation, respectively, on the Consolidated Statement of Operations.
Income Taxes	Income Taxes : The Company has been and continues to expect to be treated as a partnership for U.S. federal income tax purposes. Certain of the Company's subsidiaries are not consolidated for U.S. federal income tax purposes, but are also treated as partnerships. In general, partnerships are not subject to entity-level tax on their income, but the income of a partnership is taxable to its owners on a flow-through basis. In addition, certain subsidiaries of the Company have elected to be treated as corporations for U.S. federal income tax purposes, and one has elected to be taxed as a real estate investment trust, or "REIT." The Company follows the authoritative guidance on accounting for and disclosure of uncertainty on tax positions, which requires management to determine whether a tax position of the Company is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on the technical merits of the position. For uncertain tax positions, the tax benefit to be recognized is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. The Company did not have any additions to unrecognized tax benefits resulting from tax positions related either to the current period or to 2016, 2015, or 2014 (its open tax years), and no reductions resulting from tax positions of prior years or due to settlements, and thus had no unrecognized tax benefits or reductions since inception. The Company does not expect any change in unrecognized tax benefits within the next fiscal year. There were no amounts accrued for tax penalties or interest as of or during the periods presented in these consolidated financial statements. The Company may take positions with respect to certain tax issues which depend on legal interpretation of facts or applicable tax regulations. Should the relevant tax regulators successfully challenge any of such positions, the Company might be found to have a tax liability that has not been recorded in the accompanying consolidated financial statements. Also, management's conclusions regarding ASC 740-10 may be subject to review and adjustment at a later date based on factors including, but not limited to, further implementation guidance from the Financial Accounting Standards Board, or "FASB," and ongoing analyses of tax laws, regulations and interpretations thereof.
Recent Accounting Pronouncements	Recent Accounting Pronouncements : In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows—Restricted Cash ("ASU 2016-18"). This amends ASC 230, Statement of Cash Flows , to require that the statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash and restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, with early adoption permitted. The adoption of ASU 2016-18 is not expected to have a material impact on the Company's consolidated financial statements.
Reverse Repurchase Agreements [Member]
Investment Holdings [Line Items]
Repurchase Agreements	Reverse Repurchase Agreements : The Company enters into reverse repurchase agreements with third-party broker-dealers whereby it sells securities under agreements to be repurchased at an agreed-upon price and date. The Company accounts for reverse repurchase agreements as collateralized borrowings, with the initial sale price representing the amount borrowed, and with the future repurchase price consisting of the amount borrowed plus interest, at the implied interest rate of the reverse repurchase agreement, on the amount borrowed over the term of the reverse repurchase agreement. The interest rate on a reverse repurchase agreement is based on competitive rates (or competitive market spreads, in the case of agreements with floating interest rates) at the time such agreement is entered into. When the Company enters into a reverse repurchase agreement, the lender establishes and maintains an account containing cash and/or securities having a value not less than the repurchase price, including accrued interest, of the reverse repurchase agreement. Reverse repurchase agreements are carried at their contractual amounts, which approximate fair value as the debt is short-term in nature.
Repurchase Agreements [Member]
Investment Holdings [Line Items]
Repurchase Agreements	Repurchase Agreements : The Company enters into repurchase agreement transactions whereby it purchases securities under agreements to resell at an agreed-upon price and date. In general, securities received pursuant to repurchase agreements are delivered to counterparties of short sale transactions. The interest rate on a repurchase agreement is based on competitive rates (or competitive market spreads, in the case of agreements with floating interest rates) at the time such agreement is entered into. Assets held pursuant to repurchase agreements are reflected as assets on the Consolidated Statement of Assets, Liabilities, and Equity. Repurchase agreements are carried at fair value based on their contractual amounts as the debt is short-term in nature. Repurchase and reverse repurchase agreements that are conducted with the same counterparty may be reported on a net basis if they meet the requirements of ASC 210-20, Balance Sheet Offsetting . There are no repurchase and reverse repurchase agreements reported on a net basis in the Company's consolidated financial statements.

Valuation (Tables)

Valuation (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule Of Financial Instruments	The table below reflects the value of the Company's Level 1, Level 2, and Level 3 financial instruments at December 31, 2017 : Description Level 1 Level 2 Level 3 Total Assets: (In thousands) Cash equivalents $ 26,500 $ — $ — $ 26,500 Investments, at fair value- Agency residential mortgage-backed securities $ — $ 989,341 $ 6,173 $ 995,514 Private label residential mortgage-backed securities — 158,369 101,297 259,666 Private label commercial mortgage-backed securities — 28,398 12,347 40,745 Commercial mortgage loans — — 108,301 108,301 Residential mortgage loans — — 182,472 182,472 Collateralized loan obligations — 185,905 24,911 210,816 Consumer loans and asset-backed securities backed by consumer loans — — 135,258 135,258 Corporate debt — 51,246 23,947 75,193 Real estate owned — — 26,277 26,277 Corporate equity investments — — 37,465 37,465 Total investments, at fair value — 1,413,259 658,448 2,071,707 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities — — 3,140 3,140 Credit default swaps on corporate bond indices — 1,429 — 1,429 Credit default swaps on corporate bonds — 8,888 — 8,888 Credit default swaps on asset-backed indices — 5,393 — 5,393 Interest rate swaps — 9,266 — 9,266 Options 3 1 — 4 Futures 45 — — 45 Total financial derivatives–assets, at fair value 48 24,977 3,140 28,165 Repurchase agreements, at fair value — 155,949 — 155,949 Total investments, financial derivatives–assets, and repurchase agreements, at fair value $ 48 $ 1,594,185 $ 661,588 $ 2,255,821 Liabilities: Investments sold short, at fair value- Agency residential mortgage-backed securities $ — $ (460,189 ) $ — $ (460,189 ) Government debt — (90,149 ) — (90,149 ) Corporate debt — (55,211 ) — (55,211 ) Common stock (36,691 ) — — (36,691 ) Total investments sold short, at fair value (36,691 ) (605,549 ) — (642,240 ) Description Level 1 Level 2 Level 3 Total (continued) (In thousands) Financial derivatives–liabilities, at fair value- Credit default swaps on corporate bond indices $ — $ (12,367 ) $ — $ (12,367 ) Credit default swaps on corporate bonds — (15,930 ) — (15,930 ) Credit default swaps on asset-backed indices — (980 ) — (980 ) Interest rate swaps — (6,015 ) — (6,015 ) Futures (508 ) — — (508 ) Forwards — (473 ) — (473 ) Total financial derivatives–liabilities, at fair value (508 ) (35,765 ) — (36,273 ) Other secured borrowings, at fair value $ — $ — $ (125,105 ) $ (125,105 ) Total investments sold short, financial derivatives–liabilities, and other secured borrowings, at fair value $ (37,199 ) $ (641,314 ) $ (125,105 ) $ (803,618 ) The table below reflects the value of the Company's Level 1, Level 2, and Level 3 financial instruments at December 31, 2016 : Description Level 1 Level 2 Level 3 Total Assets: (In thousands) Cash equivalents $ 90,000 $ — $ — $ 90,000 Investments, at fair value- Agency residential mortgage-backed securities $ — $ 868,345 $ 29,622 $ 897,967 U.S. Treasury securities — 5,419 — 5,419 Private label residential mortgage-backed securities — 53,525 90,083 143,608 Private label commercial mortgage-backed securities — — 43,268 43,268 Commercial mortgage loans — — 61,129 61,129 Residential mortgage loans — — 84,290 84,290 Collateralized loan obligations — — 44,956 44,956 Consumer loans and asset-backed securities backed by consumer loans (1) — — 107,157 107,157 Corporate debt — 55,091 25,004 80,095 Real estate owned — — 3,349 3,349 Corporate equity investments (1) 4,396 — 29,392 33,788 Total investments, at fair value 4,396 982,380 518,250 1,505,026 Description Level 1 Level 2 Level 3 Total (continued) (In thousands) Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities $ — $ — $ 5,326 $ 5,326 Credit default swaps on corporate bond indices — 2,744 — 2,744 Credit default swaps on corporate bonds — 2,360 — 2,360 Credit default swaps on asset-backed indices — 16,713 — 16,713 Interest rate swaps — 8,102 — 8,102 Total return swaps — — 155 155 Options 42 2 — 44 Futures 29 — — 29 Forwards — 16 — 16 Warrants — — 106 106 Total financial derivatives–assets, at fair value 71 29,937 5,587 35,595 Repurchase agreements, at fair value — 184,819 — 184,819 Total investments, financial derivatives–assets, and repurchase agreements, at fair value $ 4,467 $ 1,197,136 $ 523,837 $ 1,725,440 Liabilities: Investments sold short, at fair value- Agency residential mortgage-backed securities $ — $ (404,728 ) $ — $ (404,728 ) Government debt — (132,442 ) — (132,442 ) Corporate debt — (39,572 ) — (39,572 ) Common stock (8,154 ) — — (8,154 ) Total investments sold short, at fair value (8,154 ) (576,742 ) — (584,896 ) Financial derivatives–liabilities, at fair value- Credit default swaps on corporate bond indices — (2,840 ) — (2,840 ) Credit default swaps on corporate bonds — (6,654 ) — (6,654 ) Credit default swaps on asset-backed indices — (2,899 ) — (2,899 ) Credit default swaps on asset-backed securities — — (256 ) (256 ) Interest rate swaps — (5,162 ) — (5,162 ) Total return swaps — (55 ) (249 ) (304 ) Futures (69 ) — — (69 ) Forwards — (472 ) — (472 ) Mortgage loan purchase commitments — (31 ) — (31 ) Total financial derivatives–liabilities, at fair value (69 ) (18,113 ) (505 ) (18,687 ) Total investments sold short and financial derivatives–liabilities, at fair value $ (8,223 ) $ (594,855 ) $ (505 ) $ (603,583 )
Schedule Of Significant Unobservable Inputs, Qualitative Information	The following table identifies the significant unobservable inputs that affect the valuation of the Company's Level 3 assets and liabilities as of December 31, 2017 : Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Private label residential mortgage-backed securities $ 40,870 Market Quotes Non Binding Third-Party Valuation $ 45.00 $ 183.00 $ 81.63 Collateralized loan obligations 10,288 Market Quotes Non Binding Third-Party Valuation 85.00 435.00 138.94 Corporate debt and non-exchange traded corporate equity 6,797 Market Quotes Non Binding Third-Party Valuation 8.88 105.63 82.94 Private label commercial mortgage-backed securities 7,577 Market Quotes Non Binding Third-Party Valuation 5.31 60.55 36.19 Agency interest only residential mortgage-backed securities 1,225 Market Quotes Non Binding Third-Party Valuation 10.14 18.21 15.25 Private label residential mortgage-backed securities 60,427 Discounted Cash Flows Yield 0.5 % 26.5 % 9.8 % Projected Collateral Prepayments 2.1 % 84.7 % 38.3 % Projected Collateral Losses 0.9 % 18.2 % 8.6 % Projected Collateral Recoveries 0.3 % 31.5 % 11.3 % Projected Collateral Scheduled Amortization 12.5 % 90.2 % 41.8 % 100.0 % Private label commercial mortgage-backed securities 4,770 Discounted Cash Flows Yield 4.3 % 42.5 % 18.6 % Projected Collateral Losses 1.1 % 5.2 % 2.5 % Projected Collateral Recoveries 2.8 % 17.1 % 8.5 % Projected Collateral Scheduled Amortization 80.1 % 96.1 % 89.0 % 100.0 % Corporate debt and non-exchange traded corporate equity 20,301 Discounted Cash Flows Yield 3.0 % 16.1 % 10.6 % (continued) Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Collateralized loan obligations $ 14,623 Discounted Cash Flows Yield 7.1 % 62.2 % 15.2 % Projected Collateral Prepayments 22.5 % 92.9 % 77.9 % Projected Collateral Losses 1.9 % 40.2 % 10.3 % Projected Collateral Recoveries 3.4 % 37.2 % 9.5 % Projected Collateral Scheduled Amortization — % 4.1 % 2.3 % 100.0 % Consumer loans and asset-backed securities backed by consumer loans 135,258 Discounted Cash Flows Yield 7.0 % 18.9 % 9.5 % Projected Collateral Prepayments 2.2 % 50.1 % 33.5 % Projected Collateral Losses 0.4 % 28.6 % 8.2 % Projected Collateral Scheduled Amortization 46.8 % 95.2 % 58.3 % 100.0 % Performing commercial mortgage loans 84,377 Discounted Cash Flows Yield 8.0 % 15.4 % 10.7 % Non-performing commercial mortgage loans and commercial real estate owned 49,610 Discounted Cash Flows Yield 11.4 % 36.5 % 17.7 % Months to Resolution 4.0 17.0 9.5 Performing residential mortgage loans 42,030 Discounted Cash Flows Yield 1.6 % 18.8 % 6.2 % Securitized residential mortgage loans (1) 132,424 Discounted Cash Flows Yield 3.5 % 3.5 % 3.5 % Non-performing residential mortgage loans and residential real estate owned 8,609 Discounted Cash Flows Yield 2.8 % 34.5 % 8.9 % Months to Resolution (2) 1.9 40.5 25.6 Credit default swaps on asset-backed securities 3,140 Net Discounted Cash Flows Projected Collateral Prepayments 19.8 % 26.5 % 22.4 % Projected Collateral Losses 14.6 % 23.8 % 19.7 % Projected Collateral Recoveries 5.8 % 14.3 % 10.6 % Projected Collateral Scheduled Amortization 45.5 % 51.0 % 47.3 % 100.0 % Agency interest only residential mortgage-backed securities 4,948 Option Adjusted Spread ("OAS") LIBOR OAS (3) 381 3,521 730 Projected Collateral Prepayments 51.2 % 100.0 % 69.1 % Projected Collateral Scheduled Amortization 0.0 % 48.8 % 30.9 % 100.0 % Non-exchange traded common equity investment in mortgage-related entity 2,814 Enterprise Value Equity Price-to-Book (4) 2.0x 2.0x 2.0x Non-exchange traded preferred equity investment in mortgage-related entity 20,774 Enterprise Value Equity Price-to-Book (4) 0.9x 0.9x 0.9x Non-controlling equity interest in limited liability company 5,033 Market Quotes Non Binding Third-Party Valuation of the Underlying Assets (5) $ 96.91 $ 96.91 $ 96.91 Non-controlling equity interest in limited liability company 5,693 Discounted Cash Flows Yield (5) 9.1% 9.1% 9.1% Other secured borrowings, at fair value (1) (125,105 ) Discounted Cash Flows Yield 2.8% 2.8% 2.8% (1) Securitized residential mortgage loans and Other secured borrowings, at fair value, represent financial assets and liabilities of the Company's CFE as discussed in Note 2. (2) Excludes certain loans that are re-performing. (3) Shown in basis points. (4) Represent an estimation of where market participants might value an enterprise on a price-to-book basis. (5) Represents the significant unobservable inputs used to fair value the financial instruments of the limited liability company. The fair value of such financial instruments is the largest component of the valuation of the limited liability company as a whole. The following table identifies the significant unobservable inputs that affect the valuation of the Company's Level 3 assets and liabilities as of December 31, 2016: Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Private label residential mortgage-backed securities $ 47,024 Market Quotes Non Binding Third-Party Valuation $ 2.00 $ 101.02 $ 67.51 Collateralized loan obligations 37,517 Market Quotes Non Binding Third-Party Valuation 9.42 100.25 83.36 Corporate debt and non-exchange traded corporate equity 19,017 Market Quotes Non Binding Third-Party Valuation 1.88 102.25 87.14 Private label commercial mortgage-backed securities 27,283 Market Quotes Non Binding Third-Party Valuation 5.17 77.75 40.88 Agency interest only residential mortgage-backed securities 23,322 Market Quotes Non Binding Third-Party Valuation 2.47 20.17 11.65 Total return swaps (94 ) Market Quotes Non Binding Third-Party Valuation (1) 98.25 99.50 98.77 Private label residential mortgage-backed securities 43,059 Discounted Cash Flows Yield 0.6 % 20.5 % 11.0 % Projected Collateral Prepayments 0.0 % 81.0 % 10.0 % Projected Collateral Losses 1.4 % 51.2 % 41.4 % Projected Collateral Recoveries 0.4 % 53.6 % 41.2 % Projected Collateral Scheduled Amortization 0.0 % 90.7 % 7.4 % 100.0 % Private label commercial mortgage-backed securities 15,985 Discounted Cash Flows Yield 8.8 % 57.0 % 23.6 % Projected Collateral Losses 0.1 % 5.3 % 2.2 % Projected Collateral Recoveries 0.9 % 20.5 % 10.7 % Projected Collateral Scheduled Amortization 77.8 % 99.0 % 87.1 % 100.0 % Corporate debt and warrants 10,080 Discounted Cash Flows Yield 19.7 % 19.7 % 19.7 % Collateralized loan obligations 7,439 Discounted Cash Flows Yield 11.2 % 50.3 % 20.5 % Projected Collateral Prepayments 11.4 % 55.2 % 45.5 % Projected Collateral Losses 4.5 % 28.3 % 10.7 % Projected Collateral Recoveries 1.5 % 27.2 % 8.6 % Projected Collateral Scheduled Amortization 29.8 % 51.5 % 35.2 % 100.0 % Consumer loans and asset-backed securities backed by consumer loans (2) 107,157 Discounted Cash Flows Yield 9.0 % 25.0 % 11.0 % Projected Collateral Prepayments 0.0 % 45.4 % 25.6 % Projected Collateral Losses 3.3 % 97.4 % 9.4 % Projected Collateral Scheduled Amortization 0.0 % 87.7 % 65.0 % 100.0 % Performing commercial mortgage loans 32,557 Discounted Cash Flows Yield 8.0 % 17.2 % 11.6 % (continued) Fair Value Valuation Technique Unobservable Input Range Weighted Average Description Min Max (In thousands) Non-performing commercial mortgage loans and commercial real estate owned $ 30,222 Discounted Cash Flows Yield 10.2 % 27.8 % 16.3 % Months to Resolution 3.0 39.1 19.5 Performing residential mortgage loans 78,576 Discounted Cash Flows Yield 5.0 % 13.5 % 6.6 % Non-performing residential mortgage loans and residential real estate owned 7,413 Discounted Cash Flows Yield 5.8 % 39.9 % 9.7 % Months to Resolution 1.8 162.9 41.9 Credit default swaps on asset-backed securities 5,070 Net Discounted Cash Flows Projected Collateral Prepayments 19.3 % 29.8 % 22.7 % Projected Collateral Losses 15.3 % 27.6 % 22.2 % Projected Collateral Recoveries 4.7 % 15.3 % 8.7 % Projected Collateral Scheduled Amortization 43.2 % 50.2 % 46.4 % 100.0 % Non-exchange traded equity investments in commercial mortgage-related private partnerships 3,090 Discounted Cash Flows Yield 16.5 % 16.5 % 16.5 % Expected Holding Period (Months) 2.9 2.9 2.9 Agency interest only residential mortgage-backed securities 6,300 Option Adjusted Spread ("OAS") LIBOR OAS (3) 142 2,831 568 Projected Collateral Prepayments (2) 0.0 % 100.0 % 63.6 % Projected Collateral Scheduled Amortization 0.0 % 88.1 % 36.4 % 100.0 % Non-exchange traded preferred and common equity investment in mortgage-related entity 2,500 Enterprise Value Equity Price-to-Book (4) 1.3x 1.3x 1.3x Non-controlling equity interest in limited liability company (2) 7,315 Net Discounted Cash Flows Yield 8.5 % 8.5 % 8.5 % Non-exchange traded preferred equity investment in mortgage-related entity 12,500 Recent Transactions Transaction Price N/A N/A N/A (1) Represents valuations on underlying assets. (2) Conformed to current period presentation. (3) Shown in basis points. (4) Represent an estimation of where market participants might value an enterprise on a price-to-book basis.
Fair Value Measurement Using Significant Unobservable Inputs	The tables below include a roll-forward of the Company's financial instruments for the years ended December 31, 2017 , 2016, and 2015 (including the change in fair value), for financial instruments classified by the Company within Level 3 of the valuation hierarchy. Level 3—Fair Value Measurement Using Significant Unobservable Inputs: Year Ended December 31, 2017 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Sales/ Transfers Into Level 3 Transfers Out of Level 3 Ending Balance as of December 31, 2017 Assets: Investments, at fair value- Agency residential mortgage-backed securities $ 29,622 $ (9,356 ) $ (956 ) $ (165 ) $ 3,867 $ (153 ) $ — $ (16,686 ) $ 6,173 Private label residential mortgage-backed securities 90,083 2,203 763 9,498 68,724 (54,690 ) 14,021 (29,305 ) 101,297 Private label commercial mortgage-backed securities 43,268 469 (3,596 ) 8,654 6,661 (37,665 ) — (5,444 ) 12,347 Commercial mortgage loans 61,129 921 419 1,957 78,333 (34,458 ) — — 108,301 Residential mortgage loans 84,290 (599 ) 1,602 3,536 140,535 (46,892 ) — — 182,472 Collateralized loan obligations 44,956 (6,833 ) 2,233 2,606 71,338 (76,775 ) — (12,614 ) 24,911 Consumer loans and asset-backed securities backed by consumer loans 107,157 (13,754 ) 855 (171 ) 129,525 (88,354 ) — — 135,258 Corporate debt 25,004 252 527 223 97,466 (99,525 ) — — 23,947 Real estate owned 3,349 — 411 322 25,516 (3,321 ) — — 26,277 Corporate equity investments 29,392 — 2,347 (512 ) 16,417 (10,179 ) — — 37,465 Total investments, at fair value 518,250 (26,697 ) 4,605 25,948 638,382 (452,012 ) 14,021 (64,049 ) 658,448 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities 5,326 — 270 (1,202 ) 137 (1,391 ) — — 3,140 Total return swaps 155 — 224 (155 ) 1 (225 ) — — — Warrants 106 — (100 ) (6 ) — — — — — Total financial derivatives– assets, at fair value 5,587 — 394 (1,363 ) 138 (1,616 ) — — 3,140 Total investments and financial derivatives–assets, at fair value $ 523,837 $ (26,697 ) $ 4,999 $ 24,585 $ 638,520 $ (453,628 ) $ 14,021 $ (64,049 ) $ 661,588 (In thousands) Ending Accreted Net Realized Change in Net Purchases/ Sales/ Transfers Into Level 3 Transfers Out of Level 3 Ending Liabilities: Financial derivatives–liabilities, at fair value- Credit default swaps on asset-backed securities $ (256 ) $ — $ (871 ) $ 939 $ 736 $ (548 ) $ — $ — $ — Total return swaps (249 ) — (554 ) 249 572 (18 ) — — — Total financial derivatives– liabilities, at fair value (505 ) — (1,425 ) 1,188 1,308 (566 ) — — — Other secured borrowings, at fair value: Other secured borrowings, at fair value — — — — — (125,105 ) — — (125,105 ) Total other secured borrowings, at fair value — — — — — (125,105 ) — — (125,105 ) Total financial derivatives– liabilities and other secured borrowings at fair value $ (505 ) $ — $ (1,425 ) $ 1,188 $ 1,308 $ (125,671 ) $ — $ — $ (125,105 ) All amounts of net realized and change in net unrealized gain (loss) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gain (loss) for both Level 3 financial instruments held by the Company at December 31, 2017 , as well as Level 3 financial instruments disposed of by the Company during the year ended December 31, 2017 . For Level 3 financial instruments held by the Company at December 31, 2017 , change in net unrealized gain (loss) of $10.6 million and $(1.2) million for the year ended December 31, 2017 relate to investments and financial derivatives–assets, respectively. As of June 30, 2017, the Company modified its procedures to determine the level within the hierarchy for certain financial instruments. Under the revised procedure, the Company examines financial instruments individually rather than in cohorts of like instruments as it had previously. As of December 31, 2017 , the Company transferred $64.0 million of securities from Level 3 to Level 2 and $14.0 million from Level 2 to Level 3. Transfers between these hierarchy levels were based on the availability of sufficient observable inputs to meet Level 2 versus Level 3 criteria. The leveling of each financial instrument is reassessed at the end of each period, and is based on pricing information received from third-party pricing sources. Year Ended December 31, 2016 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Payments Sales/ Issuances Transfers Into Level 3 Transfers Out of Level 3 Ending Assets: Investments, at fair value- Agency residential mortgage-backed securities $ 24,918 $ (7,998 ) $ (536 ) $ 845 $ 12,665 $ (272 ) $ — $ — $ 29,622 Private label residential mortgage-backed securities 116,435 1,896 (2,748 ) 3,972 30,065 (55,407 ) 10,041 (14,171 ) 90,083 Private label commercial mortgage-backed securities 34,145 1,627 1,008 (6,081 ) 24,488 (11,919 ) — — 43,268 Commercial mortgage loans 66,399 2,463 1,920 (1,434 ) 39,684 (47,903 ) — — 61,129 Residential mortgage loans 22,089 467 774 (800 ) 102,224 (40,464 ) — — 84,290 Collateralized loan obligations 45,974 (3,829 ) 71 2,471 27,862 (27,593 ) — — 44,956 Consumer loans and asset-backed securities backed by consumer loans (1) 115,376 (10,668 ) (164 ) (3,711 ) 154,101 (147,777 ) — — 107,157 Corporate debt 27,028 (60 ) (8,326 ) 6,864 26,851 (27,353 ) — — 25,004 Real estate owned 12,522 — 2,256 (458 ) 17,526 (28,497 ) — — 3,349 Corporate equity investments (1) 22,088 — (144 ) (3,075 ) 44,680 (34,157 ) — — 29,392 Total investments, at fair value 486,974 (16,102 ) (5,889 ) (1,407 ) 480,146 (421,342 ) 10,041 (14,171 ) 518,250 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities 6,332 — 1,042 (667 ) 148 (1,529 ) — — 5,326 Total return swaps 85 — 3,070 70 57 (3,127 ) — — 155 Warrants 150 — (50 ) 6 7,486 (7,486 ) — — 106 Total financial derivatives– assets, at fair value 6,567 — 4,062 (591 ) 7,691 (12,142 ) — — 5,587 Total investments and financial derivatives–assets, at fair value $ 493,541 $ (16,102 ) $ (1,827 ) $ (1,998 ) $ 487,837 $ (433,484 ) $ 10,041 $ (14,171 ) $ 523,837 Liabilities: Investments sold short, at fair value Corporate debt $ (448 ) $ (1 ) $ 362 $ (228 ) $ 315 $ — $ — $ — $ — Total investments sold short, at fair value (448 ) (1 ) 362 (228 ) 315 — — — — Financial derivatives– liabilities, at fair value- Credit default swaps on asset-backed securities (221 ) — (323 ) (36 ) 324 — — — (256 ) Total return swaps (4,662 ) — (7,534 ) 4,413 8,214 (680 ) — — (249 ) Total financial derivatives– liabilities, at fair value (4,883 ) — (7,857 ) 4,377 8,538 (680 ) — — (505 ) Guarantees: Guarantees (828 ) — — 828 — — — — — Total guarantees (828 ) — — 828 — — — — — Total investments sold short, financial derivatives–liabilities, and guarantees, at fair value $ (6,159 ) $ (1 ) $ (7,495 ) $ 4,977 $ 8,853 $ (680 ) $ — $ — $ (505 ) (1) Conformed to current period presentation. All amounts of net realized and change in net unrealized gain (loss) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gain (loss) for both Level 3 financial instruments held by the Company at December 31, 2016 , as well as Level 3 financial instruments disposed of by the Company during the year ended December 31, 2016 . For Level 3 financial instruments held by the Company at December 31, 2016 , change in net unrealized gain (loss) of $(14.7) million , $(0.8) million , and $(0.2) million , for the year ended December 31, 2016 relate to investments, financial derivatives–assets, and financial derivatives–liabilities, respectively. As of December 31, 2016 , the Company transferred $14.2 million of non-Agency RMBS from Level 3 to Level 2. These assets were transferred from Level 3 to Level 2 based on an increased volume of observed trading of these and similar assets. This increase in observed trading activity led to greater price transparency for these assets, thereby making a Level 2 designation appropriate in the Company's view. In addition, as of December 31, 2016 , the Company transferred $10.0 million of non-Agency RMBS from Level 2 to Level 3. Since December 31, 2015, these securities exhibited indications of a reduced level of price transparency. Examples of such indications include wider spreads relative to similar securities and a reduction in observable transactions involving these and similar securities. Year Ended December 31, 2015 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Payments Sales/ Issuances Transfers Into Level 3 Transfers Out of Level 3 Ending Assets: Investments, at fair value- Agency residential mortgage-backed securities $ 31,385 $ (8,355 ) $ 223 $ 81 $ 6,977 $ (5,393 ) $ — $ — $ 24,918 Private label residential mortgage-backed securities 274,369 8,593 20,648 (16,429 ) 62,994 (191,902 ) 6,687 (48,525 ) 116,435 Private label commercial mortgage-backed securities 53,311 3,076 2,000 (4,183 ) 21,382 (41,441 ) — — 34,145 Commercial mortgage loans 28,309 1,895 1,114 (142 ) 69,778 (34,555 ) — — 66,399 Residential mortgage loans 27,482 1,363 2,372 (505 ) 19,555 (28,178 ) — — 22,089 Collateralized loan obligations 121,994 (21,110 ) 46 (4,033 ) 59,102 (110,025 ) — — 45,974 Consumer loans and asset-backed securities backed by consumer loans 24,294 (6,197 ) — 283 139,373 (42,377 ) — — 115,376 Corporate debt 42,708 60 (4,028 ) (6,882 ) 28,942 (33,772 ) — — 27,028 Real estate owned 8,635 — 1,168 381 14,155 (11,817 ) — — 12,522 Private corporate equity investments 14,512 — 116 (306 ) 8,347 (581 ) — — 22,088 Total investments, at fair value 626,999 (20,675 ) 23,659 (31,735 ) 430,605 (500,041 ) 6,687 (48,525 ) 486,974 Financial derivatives–assets, at fair value- Credit default swaps on asset-backed securities $ 11,387 $ — $ (2,964 ) $ 2,098 $ 28 $ (4,217 ) $ — $ — $ 6,332 Total return swaps — — 113 85 — (113 ) — — 85 Warrants 100 — — — 50 — — — 150 Total financial derivatives– assets, at fair value 11,487 — (2,851 ) 2,183 78 (4,330 ) — — 6,567 Total investments and financial derivatives–assets, at fair value $ 638,486 $ (20,675 ) $ 20,808 $ (29,552 ) $ 430,683 $ (504,371 ) $ 6,687 $ (48,525 ) $ 493,541 (In thousands) Ending Accreted Discounts / (Amortized Premiums) Net Realized Gain/ (Loss) Change in Net Unrealized Gain/(Loss) Purchases/ Payments Sales/ Issuances Transfers Into Level 3 Transfers Out of Level 3 Ending Liabilities: Investments sold short, at fair value Corporate debt $ — $ (2 ) $ 197 $ 228 $ 1,372 $ (2,243 ) $ — $ — $ (448 ) Total investments sold short, at fair value — (2 ) 197 228 1,372 (2,243 ) — — (448 ) Financial derivatives– liabilities, at fair value- Credit default swaps on asset-backed securities $ (239 ) $ — $ (102 ) $ 35 $ — $ 85 $ — $ — $ (221 ) Total return swaps — — 2,516 (4,662 ) 14 (2,530 ) — — (4,662 ) Total financial derivatives– liabilities, at fair value (239 ) — 2,414 (4,627 ) 14 (2,445 ) — — (4,883 ) Securitized debt: Securitized debt (774 ) (15 ) — 26 763 — — — — Total securitized debt (774 ) (15 ) — 26 763 — — — — Guarantees: Guarantees — — — (828 ) — — — — (828 ) Total guarantees — — — (828 ) — — — — (828 ) Total investments sold short, financial derivatives–liabilities, securitized debt, and guarantees, at fair value $ (1,013 ) $ (17 ) $ 2,611 $ (5,201 ) $ 2,149 $ (4,688 ) $ — $ — $ (6,159 ) All amounts of net realized and change in net unrealized gain (loss) in the table above are reflected in the accompanying Consolidated Statement of Operations. The table above incorporates changes in net unrealized gain (loss) for both Level 3 financial instruments held by the Company at December 31, 2015, as well as Level 3 financial instruments disposed of by the Company during the year ended December 31, 2015. For Level 3 financial instruments held by the Company at December 31, 2015, change in net unrealized gain (loss) of $(20.7) million , $7 thousand , $(4.6) million , and $(0.8) million , for the year ended December 31, 2015 relate to investments, financial derivatives–assets, financial derivatives–liabilities, and guarantees, respectively. As of December 31, 2015, the Company transferred $48.5 million of non-Agency RMBS from Level 3 to Level 2. These assets were transferred from Level 3 to Level 2 based on an increased volume of observed trading of these and/or similar assets. This increase in observed trading activity led to greater price transparency for these assets, thereby making a Level 2 designation appropriate in the Company's view. In addition, as of December 31, 2015, the Company transferred $6.7 million of non-Agency RMBS from Level 2 to Level 3. Following December 2014, these securities exhibited indications of a reduced level of price transparency. Examples of such indications include wider spreads relative to similar securities and a reduction in observable transactions involving these and similar securities. There were no transfers of financial instruments between Level 1 and Level 2 during the years ended December 31, 2017 , 2016, and 2015.

To Be Announced RMBS (Tables)

To Be Announced RMBS (Tables)	12 Months Ended
	Dec. 31, 2017
To Be Announced RMBS [Abstract]
To Be Announced RMBS [Table Text Block]	The below table details TBA assets, liabilities, and the respective related payables and receivables as of December 31, 2017 and 2016: As of December 31, 2017 December 31, 2016 Assets: (In thousands) TBA securities, at fair value (Current principal: $118,806 and $67,720, respectively) $ 123,680 $ 70,525 Receivable for securities sold relating to unsettled TBA sales 460,666 406,708 Liabilities: TBA securities sold short, at fair value (Current principal: -$442,197 and -$384,155, respectively) $ (460,189 ) $ (404,728 ) Payable for securities purchased relating to unsettled TBA purchases (123,918 ) (70,347 ) Net short TBA securities, at fair value (336,509 ) (334,203 )

Financial Derivatives (Tables)

Financial Derivatives (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Gains and Losses on Derivative Contracts	Gains and losses on the Company's derivative contracts for the years ended December 31, 2017 and 2016 are summarized in the tables below: Year Ended December 31, 2017 : Year Ended December 31, 2017 Derivative Type Primary Risk Exposure Net Realized (1) Change in Net Unrealized Gain/(Loss) (2) (In thousands) Credit default swaps on asset-backed securities Credit $ (601 ) $ (263 ) Credit default swaps on asset-backed indices Credit (5,291 ) (817 ) Credit default swaps on corporate bond indices Credit (3,336 ) (459 ) Credit default swaps on corporate bonds Credit 205 907 Total return swaps Equity Market/Credit (1,825 ) 149 Interest rate swaps Interest Rate (1,171 ) 571 Futures Interest Rate/Currency (195 ) (423 ) Forwards Currency (6,390 ) (18 ) Warrants Equity Market (100 ) (5 ) Mortgage loan purchase commitments Interest Rate — 31 Options Credit/Interest Rate/Equity Market — 10 Total $ (18,704 ) $ (317 ) (1) Includes gain/(loss) on foreign currency transactions on derivatives in the amount of $(0.1) million , which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions. (2) Includes foreign currency translation on derivatives in the amount of $(0.2) million , which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation. Year Ended December 31, 2016 : Year Ended December 31, 2016 Derivative Type Primary Risk Net Realized (1) Change in Net Unrealized Gain/(Loss) (2) (In thousands) Credit default swaps on asset-backed securities Credit $ 719 $ (703 ) Credit default swaps on asset-backed indices Credit 3,935 (3,349 ) Credit default swaps on corporate bond indices Credit (36,195 ) (4,044 ) Credit default swaps on corporate bonds Credit (14 ) 712 Total return swaps Equity Market/Credit (12,987 ) 4,427 Interest rate swaps Interest Rate (2,912 ) (1,983 ) Futures Interest Rate/ Equity Market (84 ) 456 Forwards Currency 4,093 (1,580 ) Warrants Equity Market (50 ) 6 Mortgage loan purchase commitments Interest Rates — (23 ) Options Credit/Interest Rate/Equity Market 7,174 (413 ) Total $ (36,321 ) $ (6,494 ) (1) Includes gain/(loss) on foreign currency transactions on derivatives in the amount of $0.3 million , which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions. (2) Includes foreign currency translation on derivatives in the amount of $1.1 million , which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation. Year Ended December 31, 2015: Year Ended December 31, 2015 Derivative Type Primary Risk Exposure Net Realized Gain/(Loss) (1) Change in Net Unrealized Gain/(Loss) (2) (In thousands) Credit default swaps on asset-backed securities Credit $ (3,066 ) $ 2,133 Credit default swaps on asset-backed indices Credit (714 ) (285 ) Credit default swaps on corporate bond indices Credit (8,059 ) 7,503 Credit default swaps on corporate bonds Credit (1,005 ) 694 Total return swaps Equity Market/Credit 1,838 (4,564 ) Interest rate swaps (3) Interest Rates (9,603 ) 1,983 Futures Interest Rates/Equity Market 708 (676 ) Forwards Currency 4,738 377 Mortgage loan purchase commitments Interest Rates — (8 ) Options Credit/ 5,048 1,623 Total $ (10,115 ) $ 8,780 (1) Includes foreign currency translation on derivatives in the amount of $0.2 million , which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions. (2) Includes foreign currency translation on derivatives in the amount of $(1.1) million , which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation. (3) Includes a $1.5 million reimbursement from a third party.
Derivative activity, volume	The tables below detail the average notional values of the Company's financial derivatives, using absolute value of month end notional values, for the years ended December 31, 2017 and 2016: Derivative Type Year Ended Year Ended (In thousands) Interest rate swaps $ 1,306,853 $ 1,731,368 Credit default swaps 531,008 1,586,923 Total return swaps 19,760 113,628 Futures 48,244 371,900 Options 94,415 357,260 Forwards 76,784 80,513 Warrants 378 1,640 Mortgage loan purchase commitments 1,585 6,143
Schedule of Credit Derivatives	Written credit derivatives held by the Company at December 31, 2017 and 2016, are summarized below: Credit Derivatives December 31, 2017 December 31, 2016 (In thousands) Fair Value of Written Credit Derivatives, Net $ (4,770 ) $ (1,551 ) Fair Value of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1) $ (3,582 ) $ 4,552 Notional Value of Written Credit Derivatives (2) $ 177,588 $ 117,476 Notional Value of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1) $ (88,400 ) $ (68,357 ) (1) Offsetting transactions with third parties include purchased credit derivatives which have the same reference obligation. (2) The notional value is the maximum amount that a seller of credit protection would be obligated to pay, and a buyer of credit protection would receive upon occurrence of a "credit event." Movements in the value of credit default swap transactions may require the Company or the counterparty to post or receive collateral. Amounts due or owed under credit derivative contracts with an International Swaps and Derivatives Association, or "ISDA," counterparty may be offset against amounts due or owed on other credit derivative contracts with the same ISDA counterparty. As a result, the notional value of written credit derivatives involving a particular underlying reference asset or index has been reduced (but not below zero) by the notional value of any contracts where the Company has purchased credit protection on the same reference asset or index with the same ISDA counterparty.

Securitization Transactions (Ta

Securitization Transactions (Tables)	12 Months Ended
	Dec. 31, 2017
Securitization Transactions [Abstract]
Schedule of Assets and Liabilities of Consolidated Securitization Trusts [Table Text Block]	The following table details the assets and liabilities of the consolidated securitization trust included in the Company’s Consolidated Statement of Assets, Liabilities, and Equity as of December 31, 2017 and 2016: As of (In thousands) December 31, 2017 December 31, 2016 Assets: Cash and cash equivalents $ 333 $ — Investments, at fair value 132,424 — Liabilities: Interest and dividends payable 333 — Other secured borrowings, at fair value 125,105 —

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Repurchase Agreements [Table Text Block]	The following table details the Company's outstanding borrowings under reverse repurchase agreements for Agency RMBS, Credit assets (which include non-Agency MBS, CLOs, consumer loans, corporate debt, residential mortgage loans, and commercial mortgage loans and REO), and U.S. Treasury securities, by remaining maturity as of December 31, 2017 and 2016: (In thousands) December 31, 2017 December 31, 2016 Weighted Average Weighted Average Remaining Maturity Outstanding Borrowings Interest Rate Remaining Days to Maturity Outstanding Borrowings Interest Rate Remaining Days to Maturity Agency RMBS: 30 Days or Less $ 287,014 1.43 % 15 $ 405,725 0.83 % 18 31-60 Days 264,058 1.47 % 46 195,288 0.94 % 45 61-90 Days 277,950 1.63 % 74 149,965 0.97 % 74 91-120 Days — — % — 8,240 0.83 % 102 121-150 Days — — % — 11,798 0.96 % 131 151-180 Days 602 2.56 % 158 19,296 1.05 % 164 Total Agency RMBS 829,624 1.51 % 44 790,312 0.89 % 41 Credit: 30 Days or Less 37,433 2.61 % 13 94,849 2.55 % 16 31-60 Days 132,201 2.44 % 49 26,974 2.36 % 47 61-90 Days 130,875 2.75 % 77 41,522 2.43 % 77 91-120 Days — — % — 10,084 2.91 % 97 121-150 Days 8,551 3.79 % 128 1,239 2.73 % 124 151-180 Days 8,300 3.40 % 164 12,616 3.17 % 165 181-360 Days 5,090 3.59 % 280 50,557 3.46 % 316 > 360 Days 56,944 4.94 % 1094 — — % — Total Credit Assets 379,394 3.00 % 219 237,841 2.75 % 105 U.S. Treasury Securities: 30 Days or Less 297 1.70 % 2 5,428 0.91 % 4 Total U.S. Treasury Securities 297 1.70 % 2 5,428 0.91 % 4 Total $ 1,209,315 1.98 % 99 $ 1,033,581 1.32 % 56
Schedule of Maturities of Long-term Debt [Table Text Block]	The following table details the Company's principal repayment schedule for outstanding borrowings as of December 31, 2017 : Year Reverse Repurchase Agreements (1) Other Secured Borrowings (2) Senior Notes (1) Total 2018 1,152,371 42,409 — 1,194,780 2019 — 140,608 — 140,608 2020 56,944 — — 56,944 2021 — — — — 2022 — — 86,000 86,000 Total $ 1,209,315 $ 183,017 $ 86,000 $ 1,478,332 (1) Reflects the Company's contractual principal repayment dates. (2) Reflects the Company's expected principal repayment dates.

Long-Term Incentive Plan Units

Long-Term Incentive Plan Units (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unvested LTIP Units	The below table details on the Company's unvested LTIP Units as of December 31, 2017 : Grant Recipient Number of LTIP Units Granted Grant Date Vesting Date (1) Independent directors: 10,002 September 12, 2017 September 11, 2018 Partially dedicated employees: 8,533 December 12, 2017 December 12, 2018 5,886 December 12, 2017 December 12, 2019 5,583 December 13, 2016 December 13, 2018 Total unvested LTIP Units at December 31, 2017 30,004 (1) Date at which such LTIP Units will vest and become non-forfeitable.
Roll-Forward of Company's LTIP Units Outstanding	The following table summarizes issuance and exercise activity of the Company's LTIP Units for the years ended December 31, 2017 , 2016, and 2015: Year Ended Year Ended Year Ended Manager Director/ Employee Total Manager Director/ Employee Total Manager Director/ Employee Total LTIP Units Outstanding (12/31/2016, 12/31/2015, and 12/31/2014, respectively) 375,000 94,539 469,539 375,000 74,938 449,938 375,000 54,314 429,314 Granted — 24,421 24,421 — 22,076 22,076 — 22,571 22,571 Exercised — (2,801 ) (2,801 ) — (2,475 ) (2,475 ) — (1,947 ) (1,947 ) LTIP Units Outstanding (12/31/2017, 12/31/2016, and 12/31/2015, respectively) 375,000 116,159 491,159 375,000 94,539 469,539 375,000 74,938 449,938 LTIP Units Vested and Outstanding (12/31/2017, 12/31/2016, and 12/31/2015, respectively) 375,000 86,155 461,155 375,000 65,828 440,828 375,000 46,120 421,120

Common Share Capitalization (Ta

Common Share Capitalization (Tables)	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Summary of Common Shares Outstanding	The following table summarizes issuance, repurchase, and other activity with respect to the Company's common shares for the years ended December 31, 2017 , 2016, and 2015: Year Ended December 31, 2017 Year Ended December 31, 2016 Year Ended December 31, 2015 Common Shares Outstanding (12/31/2016, 12/31/2015, and 12/31/2014, respectively) 32,294,703 33,126,012 33,449,678 Share Activity: Shares repurchased (961,566 ) (833,784 ) (325,613 ) Director LTIP Units exercised 2,801 2,475 1,947 Common Shares Outstanding (12/31/2017, 12/31/2016, and 12/31/2015, respectively) 31,335,938 32,294,703 33,126,012

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Computation Of Basic And Diluted EPS	The components of the computation of basic and diluted EPS were as follows: Year Ended December 31, 2017 2016 2015 (In thousands except share amounts) Net increase (decrease) in shareholders' equity resulting from operations $ 33,981 $ (16,007 ) $ 38,089 Add: Net increase (decrease) in equity resulting from operations attributable to the participating non-controlling interest (1) 221 (101 ) 239 Net increase (decrease) in equity resulting from operations related to common shares, LTIP Unit holders, and participating non-controlling interest 34,202 (16,108 ) 38,328 Net increase (decrease) in shareholders' equity resulting from operations available to common share and LTIP Unit holders: Net increase (decrease) in shareholders' equity resulting from operations– common shares 33,487 (15,789 ) 37,604 Net increase (decrease) in shareholders' equity resulting from operations– LTIP Units 494 (218 ) 485 Dividends Paid (2) : Common shareholders (56,434 ) (63,855 ) (81,886 ) LTIP Unit holders (829 ) (880 ) (1,054 ) Non-controlling interest (373 ) (413 ) (520 ) Total dividends paid to common shareholders, LTIP Unit holders, and non-controlling interest (57,636 ) (65,148 ) (83,460 ) Undistributed (Distributed in excess of) earnings: Common shareholders (22,947 ) (79,644 ) (44,282 ) LTIP Unit holders (335 ) (1,098 ) (569 ) Non-controlling interest (152 ) (514 ) (281 ) Total undistributed (distributed in excess of) earnings attributable to common shareholders, LTIP Unit holders, and non-controlling interest $ (23,434 ) $ (81,256 ) $ (45,132 ) Weighted average shares outstanding (basic and diluted): Weighted average common shares outstanding 32,062,091 32,758,050 33,422,053 Weighted average participating LTIP Units 472,527 452,436 431,640 Weighted average non-controlling interest units 212,000 212,000 212,000 Basic earnings per common share: Distributed $ 1.76 $ 1.95 $ 2.45 Undistributed (Distributed in excess of) (0.72 ) (2.43 ) (1.32 ) $ 1.04 $ (0.48 ) $ 1.13 Diluted earnings per common share: Distributed $ 1.76 $ 1.95 $ 2.45 Undistributed (Distributed in excess of) (0.72 ) (2.43 ) (1.32 ) $ 1.04 $ (0.48 ) $ 1.13 (1) For the years ended December 31, 2017 , 2016, and 2015, excludes net increase in equity resulting from operations of $1.8 million , $0.4 million , and $0.1 million , respectively attributable to joint venture partners, which have non-participating interests as described in Note 11. (2) The Company pays quarterly dividends in arrears, so a portion of the dividends paid in each calendar year relate to the prior year's earnings.

Counterparty Risk (Tables)

Counterparty Risk (Tables)	12 Months Ended
	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Schedule Of Percentage Of Total Collateral On Reverse Repurchase Agreements [Table Text Block]	The following table details the percentage of such collateral held by counterparties who hold greater than 15% of the aggregate $1.41 billion in collateral for various reverse repurchase agreements as of December 31, 2017. In addition to the below, unencumbered investments, on a settlement date basis, of approximately $61.3 million were held in custody at the Bank of New York Mellon Corporation as of December 31, 2017. Dealer % of Total Collateral on Reverse Repurchase Agreements Royal Bank of Canada 18%
% Of Total Deposits With Dealers Held As Collateral	The following table details the percentage of collateral amounts held by dealers who hold greater than 15% of the Company's Due from Brokers, included as of December 31, 2017 : Dealer % of Total Due from Brokers Morgan Stanley 35% BNP Paribas Securities Corp. 24% J.P. Morgan Securities LLC 17%
% Of Total Receivable For Securities Sold	The following table details the percentage of amounts held by dealers who hold greater than 15% of the Company's Receivable for securities sold as of December 31, 2017 : Dealer % of Total Receivable for Securities Sold Bank of America Securities 28% Nomura Securities International Inc. 26%
Schedule of Cash and Cash Equivalents [Table Text Block]	In addition, the Company held cash and cash equivalents of $47.2 million and $123.3 million as of December 31, 2017 and 2016, respectively. The below table details the concentration of cash and cash equivalents held by each counterparty: As of Counterparty December 31, 2017 December 31, 2016 BlackRock Liquidity Funds FedFund Portfolio 56% 41% Bank of New York Mellon Corporation 37% 27% Deutsche Bank Securities 5% —% Bank of America Securities 2% —% Goldman Sachs Financial Square Funds—Government Fund —% 16% Morgan Stanley Institutional Liquidity Fund—Government Portfolio —% 16%

Restricted cash (Tables)

Restricted cash (Tables)	12 Months Ended
	Dec. 31, 2017
Restricted Cash and Investments [Abstract]
Schedule of Restricted Cash [Table Text Block]	The below table details the Company's restricted cash balances included in Restricted cash on the Consolidated Statement of Assets, Liabilities, and Equity as of December 31, 2017 and 2016. December 31, 2017 December 31, 2016 (In thousands) Restricted cash balance related to: Minimum account balance required for regulatory purposes $ 250 $ 250 Letter of credit — 230 Flow consumer loan purchase and sale agreement 175 175 Total $ 425 $ 655

Offsetting of Assets and Liab45

Offsetting of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Offsetting of Assets and Liabilities [Abstract]
Offsetting of Assets and Liabilities [Table Text Block]	The following tables present information about certain assets and liabilities representing financial instruments as of December 31, 2017 and 2016. The Company has not entered into master netting agreements with any of its counterparties. Certain of the Company's repurchase and reverse repurchase agreements and financial derivative transactions are governed by underlying agreements that generally provide a right of offset in the event of default or in the event of a bankruptcy of either party to the transaction. December 31, 2017 : Description Amount of Assets (Liabilities) Presented in the Consolidated Statements of Assets, Liabilities, and Equity (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets Financial derivatives–assets $ 28,165 $ (18,708 ) $ — $ (1,720 ) $ 7,737 Repurchase agreements 155,949 (155,949 ) — — — Liabilities Financial derivatives–liabilities (36,273 ) 18,708 — 17,565 — Reverse repurchase agreements (1,209,315 ) 155,949 1,034,808 18,558 — December 31, 2016: Description Amount of Assets (Liabilities) Presented in the Consolidated Statements of Assets, Liabilities, and Equity (1) Financial Instruments Available for Offset Financial Instruments Transferred or Pledged as Collateral (2)(3) Cash Collateral (Received) Pledged (2)(3) Net Amount (In thousands) Assets Financial derivatives–assets $ 35,595 $ (15,082 ) $ — $ (7,933 ) $ 12,580 Repurchase agreements 184,819 (184,819 ) — — — Liabilities Financial derivatives–liabilities (18,687 ) 15,082 — 3,574 (31 ) Reverse repurchase agreements (1,033,581 ) 184,819 809,573 39,189 — (1) In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis. (2) For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore, the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's reverse repurchase agreements and cash collateral pledged on the Company's financial derivative liabilities. Total financial instruments transferred or pledged as collateral on the Company's reverse repurchase agreements as of December 31, 2017 and 2016 were $1.41 billion and $1.16 billion , respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $6.4 million and $14.9 million , respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $16.6 million and $14.8 million , respectively. (3) When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above tables, the Company has made assumptions in allocating pledged or posted collateral among the various rows.

Financial Highlights (Tables)

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2017
Investment Company, Financial Highlights [Abstract]
Results of Operations For a Share Outstanding	Results of Operations for a Share Outstanding Throughout the Periods: Year Ended December 31, 2017 2016 2015 Beginning Shareholders' Equity Per Share (12/31/2016, 12/31/2015, and 12/31/2014, respectively) $ 19.75 $ 22.10 $ 23.38 Net Investment Income 1.10 1.09 1.98 Net Realized/Unrealized Gains (Losses) 0.02 (1.57 ) (0.83 ) Results of Operations Attributable to Equity 1.12 (0.48 ) 1.15 Less: Results of Operations Attributable to Non-controlling Interests (0.06 ) (0.01 ) (0.01 ) Results of Operations Attributable to Shareholders' Equity (1) 1.06 (0.49 ) 1.14 Dividends Paid to Common Shareholders (1.76 ) (1.95 ) (2.45 ) Weighted Average Share Impact on Dividends Paid (2) (0.04 ) (0.04 ) (0.05 ) Accretive (Dilutive) Effect of Share Issuances (Net of Offering Costs), Share Repurchases, and Adjustments to Non-controlling Interest 0.14 0.13 0.08 Ending Shareholders' Equity Per Share (12/31/2017, 12/31/2016, and 12/31/2015, respectively) (3) $ 19.15 $ 19.75 $ 22.10 Shares Outstanding, end of period 31,335,938 32,294,703 33,126,012 (1) Calculated based on average common shares outstanding and can differ from the calculation for EPS (See Note 13). (2) Per share impact on dividends paid relating to share issuances/repurchases during the period as well as dividends paid to LTIP and OP Unit holders. (3) If all LTIP Units and OP Units previously issued were vested and exchanged for common shares as of December 31, 2017 , 2016, and 2015, shareholders' equity per share would be $18.85, $19.46, and $21.80, respectively.
Net Asset Value Based Total Return For a Shareholder	The following table illustrates the Company's total return for the periods presented based on net asset value: Net Asset Value Based Total Return for a Shareholder: (1) Year Ended December 31, 2017 2016 2015 Total Return 6.14% (1.83)% 5.14% (1) Total return is calculated assuming reinvestment of distributions at shareholders' equity per share during the period.
Net Investment Income Ratio to Average Equity	Net Investment Income Ratio to Average Equity: (1) Year Ended December 31, 2017 2016 2015 Net Investment Income 5.51% 5.22% 8.59% (1) Average equity is calculated using month end values.
Expense Ratios to Average Equity	Expense Ratios to Average Equity: (1) Year Ended December 31, 2017 2016 2015 Operating expenses, before interest expense and other investment related expenses (2.81)% (2.93)% (2.69)% Interest expense and other investment related expenses (6.41)% (3.56)% (2.30)% Total Expenses (9.22)% (6.49)% (4.99)% (1) Average equity is calculated using month end values.

Condensed Quarterly Financial47

Condensed Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Quarterly Financial Data (Unaudited) [Abstract]
Quarterly Financial Information [Table Text Block]	Detailed below is unaudited quarterly financial data for the years ended December 31, 2017 and 2016. Three Month Period Ended March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017 (In thousands except per share amounts) INVESTMENT INCOME Interest income $ 22,886 $ 21,788 $ 21,145 $ 23,810 Other income 939 872 1,232 1,288 Total investment income 23,825 22,660 22,377 25,098 EXPENSES Base management fee to affiliate (1) 2,410 2,372 2,161 2,113 Interest expense 6,003 7,625 8,166 9,326 Other investment related expenses 1,521 2,058 1,908 4,267 Other operating expenses 2,116 2,173 2,240 2,333 Total expenses 12,050 14,228 14,475 18,039 NET INVESTMENT INCOME 11,775 8,432 7,902 7,059 NET REALIZED AND CHANGE IN NET UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY TRANSACTIONS/TRANSLATION Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions (831 ) (5,347 ) 1,205 (5,831 ) Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation 4,786 2,356 (2,512 ) 6,970 NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY 3,955 (2,991 ) (1,307 ) 1,139 NET INCREASE (DECREASE) IN EQUITY RESULTING FROM OPERATIONS 15,730 5,441 6,595 8,198 LESS: NET INCREASE IN EQUITY RESULTING FROM OPERATIONS ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 452 377 400 754 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS $ 15,278 $ 5,064 $ 6,195 $ 7,444 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS PER SHARE: Basic and Diluted (2) $ 0.47 $ 0.16 $ 0.19 $ 0.23 (1) Net of management fee rebate of $0.2 million for the each of the three month periods ended September 30, 2017 and December 31, 2017, respectively. See Note 9 for further details on management fee rebates. (2) For the year ended December 31, 2017 the sum of EPS for the four quarters of the year does not equal EPS as calculated for the entire year (see Note 13) as a result of changes in shares during the year due to repurchases of common share, as EPS is calculated using average shares outstanding during the period. Three Month Period Ended March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016 (In thousands except per share amounts) INVESTMENT INCOME Interest income $ 20,427 $ 18,990 $ 16,662 $ 18,265 Other income 1,668 1,024 807 2,342 Total investment income 22,095 20,014 17,469 20,607 EXPENSES Base management fee to affiliate 2,611 2,553 2,485 2,416 Interest expense 3,468 4,234 4,143 4,461 Other investment related expenses 1,749 2,191 2,068 2,062 Other operating expenses 2,445 2,515 2,379 2,640 Total expenses 10,273 11,493 11,075 11,579 NET INVESTMENT INCOME 11,822 8,521 6,394 9,028 NET REALIZED AND CHANGE IN NET UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY TRANSACTIONS/TRANSLATION Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions (11,940 ) (2,331 ) (23,020 ) (2,242 ) Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation (23,068 ) (1,188 ) 17,176 (4,854 ) NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY (35,008 ) (3,519 ) (5,844 ) (7,096 ) NET INCREASE (DECREASE) IN EQUITY RESULTING FROM OPERATIONS (23,186 ) 5,002 550 1,932 LESS: NET INCREASE IN EQUITY RESULTING FROM OPERATIONS ATTRIBUTABLE TO NON-CONTROLLING INTERESTS 14 17 34 240 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS $ (23,200 ) $ 4,985 $ 516 $ 1,692 NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS PER SHARE: Basic and Diluted $ (0.69 ) $ 0.15 $ 0.02 $ 0.05

Organization and Investment O48

Organization and Investment Objective Narrative (Details)	Dec. 31, 2017
Parent [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Percentage	99.30%

Significant Accounting Polici49

Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Number of days to determine non-performance of loan	90 days
Long-Term Incentive Plan Units [Member] | Director [Member]
Significant Accounting Policies [Line Items]
Vesting period	1 year
Minimum [Member] | Long-Term Incentive Plan Units [Member] | Dedicated or partially dedicated personnel [Member]
Significant Accounting Policies [Line Items]
Vesting period	1 year
Maximum [Member] | Long-Term Incentive Plan Units [Member] | Dedicated or partially dedicated personnel [Member]
Significant Accounting Policies [Line Items]
Vesting period	2 years

Valuation (Schedule Of Financia

Valuation (Schedule Of Financial Instruments) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-	[1]	$ 28,165	$ 35,595
Fair value repurchase agreements	[1]	155,949	184,819
Investments sold short, at fair value-		(642,240)	(584,896)
Financial derivatives–liabilities, at fair value-	[1]	(36,273)	(18,687)
Other secured borrowings, at fair value		125,105	0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments, financial derivatives–assets, and repurchase agreements, at fair value		2,255,821	1,725,440
Total investments sold short, financial derivatives–liabilities, and other secured borrowings, at fair value		(803,618)	(603,583)
Fair Value, Measurements, Recurring [Member] | Other secured borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other secured borrowings, at fair value		(125,105)
Fair Value, Measurements, Recurring [Member] | Investments Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(642,240)	(584,896)
Fair Value, Measurements, Recurring [Member] | Investments Sold Short [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(460,189)	(404,728)
Fair Value, Measurements, Recurring [Member] | Investments Sold Short [Member] | Government debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(90,149)	(132,442)
Fair Value, Measurements, Recurring [Member] | Investments Sold Short [Member] | Corporate Debt Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(55,211)	(39,572)
Fair Value, Measurements, Recurring [Member] | Investments Sold Short [Member] | Common Stock Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(36,691)	(8,154)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(36,273)	(18,687)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			(256)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(12,367)	(2,840)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(15,930)	(6,654)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(980)	(2,899)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(6,015)	(5,162)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			(304)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(508)	(69)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(473)	(472)
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			(31)
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		26,500	90,000
Fair Value, Measurements, Recurring [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		2,071,707	1,505,026
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		995,514	897,967
Fair Value, Measurements, Recurring [Member] | Investments [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-			5,419
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Private Label Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		259,666	143,608
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		40,745	43,268
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Commercial Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		108,301	61,129
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Residential Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		182,472	84,290
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Collateralized Loan Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		210,816	44,956
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		135,258	107,157	[2]
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		75,193	80,095
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		26,277	3,349
Fair Value, Measurements, Recurring [Member] | Investments [Member] | Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		37,465	33,788	[2]
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		28,165	35,595
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		3,140	5,326
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		1,429	2,744
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		8,888	2,360
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		5,393	16,713
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		9,266	8,102
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			155
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		4	44
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		45	29
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			16
Fair Value, Measurements, Recurring [Member] | Financial Derivatives - Assets [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			106
Fair Value, Measurements, Recurring [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value repurchase agreements		155,949	184,819
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments, financial derivatives–assets, and repurchase agreements, at fair value		48	4,467
Total investments sold short, financial derivatives–liabilities, and other secured borrowings, at fair value		(37,199)	(8,223)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other secured borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other secured borrowings, at fair value		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(36,691)	(8,154)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments Sold Short [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments Sold Short [Member] | Government debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments Sold Short [Member] | Corporate Debt Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments Sold Short [Member] | Common Stock Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(36,691)	(8,154)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(508)	(69)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(508)	(69)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		26,500	90,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	4,396
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Private Label Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Commercial Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Residential Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Collateralized Loan Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0	[2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Investments [Member] | Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	4,396	[2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		48	71
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		3	42
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		45	29
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Derivatives - Assets [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value repurchase agreements		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments, financial derivatives–assets, and repurchase agreements, at fair value		1,594,185	1,197,136
Total investments sold short, financial derivatives–liabilities, and other secured borrowings, at fair value		(641,314)	(594,855)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other secured borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other secured borrowings, at fair value		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(605,549)	(576,742)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments Sold Short [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(460,189)	(404,728)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments Sold Short [Member] | Government debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(90,149)	(132,442)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments Sold Short [Member] | Corporate Debt Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		(55,211)	(39,572)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments Sold Short [Member] | Common Stock Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(35,765)	(18,113)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(12,367)	(2,840)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(15,930)	(6,654)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(980)	(2,899)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(6,015)	(5,162)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			(55)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		(473)	(472)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			(31)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		1,413,259	982,380
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		989,341	868,345
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-			5,419
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Private Label Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		158,369	53,525
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		28,398	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Commercial Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Residential Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Collateralized Loan Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		185,905	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0	[2]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		51,246	55,091
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Investments [Member] | Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		0	0	[2]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		24,977	29,937
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		1,429	2,744
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		8,888	2,360
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		5,393	16,713
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		9,266	8,102
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		1	2
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			16
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Derivatives - Assets [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value repurchase agreements		155,949	184,819
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments, financial derivatives–assets, and repurchase agreements, at fair value		661,588	523,837
Total investments sold short, financial derivatives–liabilities, and other secured borrowings, at fair value		(125,105)	(505)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other secured borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other secured borrowings, at fair value		(125,105)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments Sold Short [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments Sold Short [Member] | Government debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments Sold Short [Member] | Corporate Debt Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments Sold Short [Member] | Common Stock Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	(505)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			(256)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			(249)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		658,448	518,250
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		6,173	29,622
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Private Label Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		101,297	90,083
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		12,347	43,268
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Commercial Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		108,301	61,129
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Residential Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		182,472	84,290
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Collateralized Loan Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		24,911	44,956
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		135,258	107,157	[2]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		23,947	25,004
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		26,277	3,349
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] | Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-		37,465	29,392	[2]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		3,140	5,587
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		3,140	5,326
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			155
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives - Assets [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-			106
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value repurchase agreements		$ 0	$ 0
[1]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.
[2]	Conformed to current period presentation.

Valuation (Schedule Of Signific

Valuation (Schedule Of Significant Unobservable Inputs, Qualitative Information) (Details) - Level 3 [Member]		12 Months Ended
		Dec. 31, 2017USD ($)		Dec. 31, 2016USD ($)
Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 40,870,000		$ 47,024,000
Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		45		2
Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		183		101.02
Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		81.63		67.51
Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 10,288,000		$ 37,517,000
Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		85		9.42
Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		435		100.25
Market Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		138.94		83.36
Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 6,797,000		$ 19,017,000
Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		8.88		1.88
Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		105.63		102.25
Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		82.94		87.14
Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 7,577,000		$ 27,283,000
Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		5.31		5.17
Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		60.55		77.75
Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		36.19		40.88
Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 1,225,000		$ 23,322,000
Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		10.14		2.47
Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		18.21		20.17
Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation		15.25		11.65
Market Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 5,033,000
Market Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[1]	96.91
Market Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[1]	96.91
Market Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[1]	96.91
Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 10,080,000
Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				19.70%
Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				19.70%
Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				19.70%
Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 60,427,000		$ 43,059,000
Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		0.50%		0.60%
Projected Collateral Prepayments		2.10%		0.00%
Fair Value Inputs Losses		0.90%		1.40%
Fair Value Inputs Projected Collateral Recoveries		0.30%		0.40%
Fair Value Inputs Projected Collateral Scheduled Amortization		12.50%		0.00%
Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		26.50%		20.50%
Projected Collateral Prepayments		84.70%		81.00%
Fair Value Inputs Losses		18.20%		51.20%
Fair Value Inputs Projected Collateral Recoveries		31.50%		53.60%
Fair Value Inputs Projected Collateral Scheduled Amortization		90.20%		90.70%
Income Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		9.80%		11.00%
Projected Collateral Prepayments		38.30%		10.00%
Fair Value Inputs Losses		8.60%		41.40%
Fair Value Inputs Projected Collateral Recoveries		11.30%		41.20%
Fair Value Inputs Projected Collateral Scheduled Amortization		41.80%		7.40%
Total Outstanding Collateral		100.00%		100.00%
Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 14,623,000		$ 7,439,000
Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		7.10%		11.20%
Projected Collateral Prepayments		22.50%		11.40%
Fair Value Inputs Losses		1.90%		4.50%
Fair Value Inputs Projected Collateral Recoveries		3.40%		1.50%
Fair Value Inputs Projected Collateral Scheduled Amortization		0.00%		29.80%
Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		62.20%		50.30%
Projected Collateral Prepayments		92.90%		55.20%
Fair Value Inputs Losses		40.20%		28.30%
Fair Value Inputs Projected Collateral Recoveries		37.20%		27.20%
Fair Value Inputs Projected Collateral Scheduled Amortization		4.10%		51.50%
Income Approach Valuation Technique [Member] | Collateralized Loan Obligations [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		15.20%		20.50%
Projected Collateral Prepayments		77.90%		45.50%
Fair Value Inputs Losses		10.30%		10.70%
Fair Value Inputs Projected Collateral Recoveries		9.50%		8.60%
Fair Value Inputs Projected Collateral Scheduled Amortization		2.30%		35.20%
Total Outstanding Collateral		100.00%		100.00%
Income Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 20,301,000
Income Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		3.00%
Income Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		16.10%
Income Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		10.60%
Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 4,770,000		$ 15,985,000
Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		4.30%		8.80%
Fair Value Inputs Losses		1.10%		0.10%
Fair Value Inputs Projected Collateral Recoveries		2.80%		0.90%
Fair Value Inputs Projected Collateral Scheduled Amortization		80.10%		77.80%
Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		42.50%		57.00%
Fair Value Inputs Losses		5.20%		5.30%
Fair Value Inputs Projected Collateral Recoveries		17.10%		20.50%
Fair Value Inputs Projected Collateral Scheduled Amortization		96.10%		99.00%
Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		18.60%		23.60%
Fair Value Inputs Losses		2.50%		2.20%
Fair Value Inputs Projected Collateral Recoveries		8.50%		10.70%
Fair Value Inputs Projected Collateral Scheduled Amortization		89.00%		87.10%
Total Outstanding Collateral		100.00%		100.00%
Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 4,948,000		$ 6,300,000
Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		51.20%		0.00%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		0.00%		0.00%
LIBOR OAS		3.81%	[3]	1.42%	[4]
Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		100.00%		100.00%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		48.80%		88.10%
LIBOR OAS		35.21%	[3]	28.31%	[4]
Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		69.10%		63.60%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		30.90%		36.40%
Total Outstanding Collateral		100.00%		100.00%
LIBOR OAS		7.30%	[3]	5.68%	[4]
Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 135,258,000		$ 107,157,000	[2]
Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		7.00%		9.00%	[2]
Projected Collateral Prepayments		2.20%		0.00%	[2]
Fair Value Inputs Losses		0.40%		3.30%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		46.80%		0.00%	[2]
Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		18.90%		25.00%	[2]
Projected Collateral Prepayments		50.10%		45.40%	[2]
Fair Value Inputs Losses		28.60%		97.40%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		95.20%		87.70%	[2]
Income Approach Valuation Technique [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		9.50%		11.00%	[2]
Projected Collateral Prepayments		33.50%		25.60%	[2]
Fair Value Inputs Losses		8.20%		9.40%	[2]
Fair Value Inputs Projected Collateral Scheduled Amortization		58.30%		65.00%	[2]
Total Outstanding Collateral		100.00%		100.00%	[2]
Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 84,377,000		$ 32,557,000
Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		8.00%		8.00%
Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		15.40%		17.20%
Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		10.70%		11.60%
Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 42,030,000		$ 78,576,000
Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		1.60%		5.00%
Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		18.80%		13.50%
Income Approach Valuation Technique [Member] | Performing Residential Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		6.20%		6.60%
Income Approach Valuation Technique [Member] | Securitized Residential Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	[5]	$ 132,424,000
Income Approach Valuation Technique [Member] | Securitized Residential Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[5]	3.50%
Income Approach Valuation Technique [Member] | Securitized Residential Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[5]	3.50%
Income Approach Valuation Technique [Member] | Securitized Residential Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[5]	3.50%
Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 8,609,000		$ 7,413,000
Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		2.80%		5.80%
Months to Resolution		1 month 27 days	[6]	1 month 24 days
Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		34.50%		39.90%
Months to Resolution		40 months 15 days	[6]	162 months 27 days
Income Approach Valuation Technique [Member] | Non-performing Residential Mortgage Loans and Residential Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		8.90%		9.70%
Months to Resolution		25 months 18 days	[6]	41 months 27 days
Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and Commercial Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 49,610,000		$ 30,222,000
Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and Commercial Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		11.40%		10.20%
Months to Resolution		4 months		3 months
Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and Commercial Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		36.50%		27.80%
Months to Resolution		17 months		39 months 3 days
Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans and Commercial Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield		17.70%		16.30%
Months to Resolution		9 months 15 days		19 months 15 days
Income Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 5,693,000
Income Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[1]	9.10%
Income Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[1]	9.10%
Income Approach Valuation Technique [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[1]	9.10%
Credit Default Swaps On Asset Backed Securities [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 3,140,000		$ 5,070,000
Credit Default Swaps On Asset Backed Securities [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		19.80%		19.30%
Fair Value Inputs Losses		14.60%		15.30%
Fair Value Inputs Projected Collateral Recoveries		5.80%		4.70%
Fair Value Inputs Projected Collateral Scheduled Amortization		45.50%		43.20%
Credit Default Swaps On Asset Backed Securities [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		26.50%		29.80%
Fair Value Inputs Losses		23.80%		27.60%
Fair Value Inputs Projected Collateral Recoveries		14.30%		15.30%
Fair Value Inputs Projected Collateral Scheduled Amortization		51.00%		50.20%
Credit Default Swaps On Asset Backed Securities [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments		22.40%		22.70%
Fair Value Inputs Losses		19.70%		22.20%
Fair Value Inputs Projected Collateral Recoveries		10.60%		8.70%
Fair Value Inputs Projected Collateral Scheduled Amortization		47.30%		46.40%
Total Outstanding Collateral		100.00%		100.00%
Total Return Swaps [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure				$ (94,000)
Total Return Swaps [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[7]			98.25
Total Return Swaps [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[7]			99.50
Total Return Swaps [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	[7]			98.77
Other secured borrowings [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liabilities, Fair Value Disclosure, Recurring	[5]	$ (125,105,000)
Other secured borrowings [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[5]	2.80%
Other secured borrowings [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[5]	2.80%
Other secured borrowings [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[5]	2.80%
Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 3,090,000
Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				16.50%
Fair Value Assumptions, Expected Term				2 months 27 days
Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				16.50%
Fair Value Assumptions, Expected Term				2 months 27 days
Corporate Equity Investments [Member] | Non-exchange traded equity investments in commercial mortgage-related private partnerships [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield				16.50%
Fair Value Assumptions, Expected Term				2 months 27 days
Corporate Equity Investments [Member] | Non-Exchange Traded Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 2,814,000
Corporate Equity Investments [Member] | Non-Exchange Traded Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[8]	2
Corporate Equity Investments [Member] | Non-Exchange Traded Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[8]	2
Corporate Equity Investments [Member] | Non-Exchange Traded Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[8]	2
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 2,500,000
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[9]			1.3
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[9]			1.3
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[9]			1.3
Corporate Equity Investments [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	[2]			$ 7,315,000
Corporate Equity Investments [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[2]			8.50%
Corporate Equity Investments [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[2]			8.50%
Corporate Equity Investments [Member] | Non-Controlling Equity Interest in Limited Liability Company [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	[2]			8.50%
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 20,774,000
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[8]	0.9
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[8]	0.9
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage-Related Entities [Member] | Enterprise Value [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Equity Multiple	[8]	0.9
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage-Related Entities [Member] | Recent Transactions [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value				$ 12,500,000
[1]	Represents the significant unobservable inputs used to fair value the financial instruments of the limited liability company. The fair value of such financial instruments is the largest component of the valuation of the limited liability company as a whole.
[2]	Conformed to current period presentation.
[3]	Shown in basis points.
[4]	Shown in basis points.
[5]	Securitized residential mortgage loans and Other secured borrowings, at fair value, represent financial assets and liabilities of the Company's CFE as discussed in Note 2.
[6]	Excludes certain loans that are re-performing.
[7]	Represents valuations on underlying assets.
[8]	Represent an estimation of where market participants might value an enterprise on a price-to-book basis.
[9]	Represent an estimation of where market participants might value an enterprise on a price-to-book basis.

Valuation (Fair Value Measureme

Valuation (Fair Value Measurement Using Significant Unobservable Inputs) (Details) - Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	$ 523,837		$ 493,541		$ 638,486
Assets, Accreted Discounts/Amortized Premiums	(26,697)		(16,102)		(20,675)
Assets, Realized Gain (Loss)	4,999		(1,827)		20,808
Assets, Change In Net Unrealized Gain/(Loss)	24,585		(1,998)		(29,552)
Assets, Purchases	638,520		487,837		430,683
Assets, Sales	(453,628)		(433,484)		(504,371)
Assets, Transfers into Level 3	14,021		10,041		6,687
Assets, Transfers out of Level 3	(64,049)		(14,171)		(48,525)
Assets, Ending Balance	661,588		523,837		493,541
Liabilities, Begining Balance	(505)		(6,159)		(1,013)
Liabilities, Accreted Discounts/Amortized Premiums	0		(1)		(17)
Liabilities, Realized Gain/(Loss)	(1,425)		(7,495)		2,611
Liabilities, Change In Net Unrealized Gain/(Loss)	1,188		4,977		(5,201)
Liabilities Purchases/Payments	1,308		8,853		2,149
Liabilities, Sales/Issuance	(125,671)		(680)		(4,688)
Liabilities, Transfers into Level 3	0		0		0
Liabilities, Transfers out of Level 3	0		0		0
Liabilities, Ending Balance	(125,105)		(505)		(6,159)
Other secured borrowings [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	0
Liabilities, Accreted Discounts/Amortized Premiums	0
Liabilities, Realized Gain/(Loss)	0
Liabilities, Change In Net Unrealized Gain/(Loss)	0
Liabilities, Payments	0
Liabilities, Issuances	(125,105)
Liabilities, Transfers into Level 3	0
Liabilities, Transfers out of Level 3	0
Liabilities, Ending Balance	(125,105)		0
Securitized debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance			0		(774)
Liabilities, Accreted Discounts/Amortized Premiums					(15)
Liabilities, Realized Gain/(Loss)					0
Liabilities, Change In Net Unrealized Gain/(Loss)					26
Liabilities, Payments					763
Liabilities, Issuances					0
Liabilities, Transfers into Level 3					0
Liabilities, Transfers out of Level 3					0
Liabilities, Ending Balance					0
Guarantees [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	0		(828)		0
Liabilities, Accreted Discounts/Amortized Premiums			0		0
Liabilities, Realized Gain/(Loss)			0		0
Liabilities, Change In Net Unrealized Gain/(Loss)			828		(828)
Liabilities, Payments			0		0
Liabilities, Issuances			0		0
Liabilities, Transfers into Level 3			0		0
Liabilities, Transfers out of Level 3			0		0
Liabilities, Ending Balance			0		(828)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)					(828)
Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	518,250		486,974		626,999
Assets, Accreted Discounts/Amortized Premiums	(26,697)		(16,102)		(20,675)
Assets, Realized Gain (Loss)	4,605		(5,889)		23,659
Assets, Change In Net Unrealized Gain/(Loss)	25,948		(1,407)		(31,735)
Assets, Purchases	638,382		480,146		430,605
Assets, Sales	(452,012)		(421,342)		(500,041)
Assets, Transfers into Level 3	14,021		10,041		6,687
Assets, Transfers out of Level 3	(64,049)		(14,171)		(48,525)
Assets, Ending Balance	658,448		518,250		486,974
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	10,600		(14,700)		(20,700)
Investments [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	29,622		24,918		31,385
Assets, Accreted Discounts/Amortized Premiums	(9,356)		(7,998)		(8,355)
Assets, Realized Gain (Loss)	(956)		(536)		223
Assets, Change In Net Unrealized Gain/(Loss)	(165)		845		81
Assets, Purchases	3,867		12,665		6,977
Assets, Sales	(153)		(272)		(5,393)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	(16,686)		0		0
Assets, Ending Balance	6,173		29,622		24,918
Investments [Member] | Private Label Residential Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	90,083		116,435		274,369
Assets, Accreted Discounts/Amortized Premiums	2,203		1,896		8,593
Assets, Realized Gain (Loss)	763		(2,748)		20,648
Assets, Change In Net Unrealized Gain/(Loss)	9,498		3,972		(16,429)
Assets, Purchases	68,724		30,065		62,994
Assets, Sales	(54,690)		(55,407)		(191,902)
Assets, Transfers into Level 3	14,021		10,041		6,687
Assets, Transfers out of Level 3	(29,305)		(14,171)		(48,525)
Assets, Ending Balance	101,297		90,083		116,435
Investments [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	43,268		34,145		53,311
Assets, Accreted Discounts/Amortized Premiums	469		1,627		3,076
Assets, Realized Gain (Loss)	(3,596)		1,008		2,000
Assets, Change In Net Unrealized Gain/(Loss)	8,654		(6,081)		(4,183)
Assets, Purchases	6,661		24,488		21,382
Assets, Sales	(37,665)		(11,919)		(41,441)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	(5,444)		0		0
Assets, Ending Balance	12,347		43,268		34,145
Investments [Member] | Commercial Mortgage Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	61,129		66,399		28,309
Assets, Accreted Discounts/Amortized Premiums	921		2,463		1,895
Assets, Realized Gain (Loss)	419		1,920		1,114
Assets, Change In Net Unrealized Gain/(Loss)	1,957		(1,434)		(142)
Assets, Purchases	78,333		39,684		69,778
Assets, Sales	(34,458)		(47,903)		(34,555)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	108,301		61,129		66,399
Investments [Member] | Residential Mortgage Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	84,290		22,089		27,482
Assets, Accreted Discounts/Amortized Premiums	(599)		467		1,363
Assets, Realized Gain (Loss)	1,602		774		2,372
Assets, Change In Net Unrealized Gain/(Loss)	3,536		(800)		(505)
Assets, Purchases	140,535		102,224		19,555
Assets, Sales	(46,892)		(40,464)		(28,178)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	182,472		84,290		22,089
Investments [Member] | Collateralized Loan Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	44,956		45,974		121,994
Assets, Accreted Discounts/Amortized Premiums	(6,833)		(3,829)		(21,110)
Assets, Realized Gain (Loss)	2,233		71		46
Assets, Change In Net Unrealized Gain/(Loss)	2,606		2,471		(4,033)
Assets, Purchases	71,338		27,862		59,102
Assets, Sales	(76,775)		(27,593)		(110,025)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	(12,614)		0		0
Assets, Ending Balance	24,911		44,956		45,974
Investments [Member] | Consumer loans and asset-backed securities backed by consumer loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	107,157	[1]	115,376	[1]	24,294
Assets, Accreted Discounts/Amortized Premiums	(13,754)		(10,668)	[1]	(6,197)
Assets, Realized Gain (Loss)	855		(164)	[1]	0
Assets, Change In Net Unrealized Gain/(Loss)	(171)		(3,711)	[1]	283
Assets, Purchases	129,525		154,101	[1]	139,373
Assets, Sales	(88,354)		(147,777)	[1]	(42,377)
Assets, Transfers into Level 3	0		0	[1]	0
Assets, Transfers out of Level 3	0		0	[1]	0
Assets, Ending Balance	135,258		107,157	[1]	115,376	[1]
Investments [Member] | Corporate Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	25,004		27,028		42,708
Assets, Accreted Discounts/Amortized Premiums	252		(60)		60
Assets, Realized Gain (Loss)	527		(8,326)		(4,028)
Assets, Change In Net Unrealized Gain/(Loss)	223		6,864		(6,882)
Assets, Purchases	97,466		26,851		28,942
Assets, Sales	(99,525)		(27,353)		(33,772)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	23,947		25,004		27,028
Investments [Member] | Real Estate Owned [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	3,349		12,522		8,635
Assets, Accreted Discounts/Amortized Premiums	0		0		0
Assets, Realized Gain (Loss)	411		2,256		1,168
Assets, Change In Net Unrealized Gain/(Loss)	322		(458)		381
Assets, Purchases	25,516		17,526		14,155
Assets, Sales	(3,321)		(28,497)		(11,817)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	26,277		3,349		12,522
Investments [Member] | Corporate Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	29,392	[1]	22,088	[1]	14,512
Assets, Accreted Discounts/Amortized Premiums	0		0	[1]	0
Assets, Realized Gain (Loss)	2,347		(144)	[1]	116
Assets, Change In Net Unrealized Gain/(Loss)	(512)		(3,075)	[1]	(306)
Assets, Purchases	16,417		44,680	[1]	8,347
Assets, Sales	(10,179)		(34,157)	[1]	(581)
Assets, Transfers into Level 3	0		0	[1]	0
Assets, Transfers out of Level 3	0		0	[1]	0
Assets, Ending Balance	37,465		29,392	[1]	22,088	[1]
Investments Sold Short [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	0		(448)		0
Liabilities, Accreted Discounts/Amortized Premiums			(1)		(2)
Liabilities, Realized Gain/(Loss)			362		197
Liabilities, Change In Net Unrealized Gain/(Loss)			(228)		228
Liabilities, Purchases			315		1,372
Liabilities, Sales			0		(2,243)
Liabilities, Transfers into Level 3			0		0
Liabilities, Transfers out of Level 3			0		0
Liabilities, Ending Balance			0		(448)
Investments Sold Short [Member] | Corporate Debt Sold Short [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	0		(448)		0
Liabilities, Accreted Discounts/Amortized Premiums			(1)		(2)
Liabilities, Realized Gain/(Loss)			362		197
Liabilities, Change In Net Unrealized Gain/(Loss)			(228)		228
Liabilities, Purchases			315		1,372
Liabilities, Sales			0		(2,243)
Liabilities, Transfers into Level 3			0		0
Liabilities, Transfers out of Level 3			0		0
Liabilities, Ending Balance			0		(448)
Financial Derivatives - Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	5,587		6,567		11,487
Assets, Accreted Discounts/Amortized Premiums	0		0		0
Assets, Realized Gain (Loss)	394		4,062		(2,851)
Assets, Change In Net Unrealized Gain/(Loss)	(1,363)		(591)		2,183
Assets, Purchases	138		7,691		78
Assets, Sales	(1,616)		(12,142)		(4,330)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	3,140		5,587		6,567
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(1,200)		(800)		7
Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	155		85		0
Assets, Accreted Discounts/Amortized Premiums	0		0		0
Assets, Realized Gain (Loss)	224		3,070		113
Assets, Change In Net Unrealized Gain/(Loss)	(155)		70		85
Assets, Purchases	1		57		0
Assets, Sales	(225)		(3,127)		(113)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	0		155		85
Financial Derivatives - Assets [Member] | Warrant [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	106		150		100
Assets, Accreted Discounts/Amortized Premiums	0		0		0
Assets, Realized Gain (Loss)	(100)		(50)		0
Assets, Change In Net Unrealized Gain/(Loss)	(6)		6		0
Assets, Purchases	0		7,486		50
Assets, Sales	0		(7,486)		0
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	0		106		150
Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	5,326		6,332		11,387
Assets, Accreted Discounts/Amortized Premiums	0		0		0
Assets, Realized Gain (Loss)	270		1,042		(2,964)
Assets, Change In Net Unrealized Gain/(Loss)	(1,202)		(667)		2,098
Assets, Purchases	137		148		28
Assets, Sales	(1,391)		(1,529)		(4,217)
Assets, Transfers into Level 3	0		0		0
Assets, Transfers out of Level 3	0		0		0
Assets, Ending Balance	3,140		5,326		6,332
Financial Derivatives - Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	(505)		(4,883)		(239)
Liabilities, Accreted Discounts/Amortized Premiums	0		0		0
Liabilities, Realized Gain/(Loss)	(1,425)		(7,857)		2,414
Liabilities, Change In Net Unrealized Gain/(Loss)	1,188		4,377		(4,627)
Liabilities, Purchases	1,308		8,538		14
Liabilities, Sales	(566)		(680)		(2,445)
Liabilities, Transfers into Level 3	0		0		0
Liabilities, Transfers out of Level 3	0		0		0
Liabilities, Ending Balance	0		(505)		(4,883)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)			(200)		(4,600)
Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	(249)		(4,662)		0
Liabilities, Accreted Discounts/Amortized Premiums	0		0		0
Liabilities, Realized Gain/(Loss)	(554)		(7,534)		2,516
Liabilities, Change In Net Unrealized Gain/(Loss)	249		4,413		(4,662)
Liabilities, Purchases	572		8,214		14
Liabilities, Sales	(18)		(680)		(2,530)
Liabilities, Transfers into Level 3	0		0		0
Liabilities, Transfers out of Level 3	0		0		0
Liabilities, Ending Balance	0		(249)		(4,662)
Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	(256)		(221)		(239)
Liabilities, Accreted Discounts/Amortized Premiums	0		0		0
Liabilities, Realized Gain/(Loss)	(871)		(323)		(102)
Liabilities, Change In Net Unrealized Gain/(Loss)	939		(36)		35
Liabilities, Purchases	736		324		0
Liabilities, Sales	(548)		0		85
Liabilities, Transfers into Level 3	0		0		0
Liabilities, Transfers out of Level 3	0		0		0
Liabilities, Ending Balance	$ 0		$ (256)		$ (221)
[1]	Conformed to current period presentation.

Valuation Valuation (Details)

Valuation Valuation (Details) $ in Millions	Dec. 31, 2017USD ($)
Valuation [Abstract]
Senior notes, estimated fair value	$ 85.6

To Be Announced RMBS (Details)

To Be Announced RMBS (Details) - USD ($) $ in Thousands	Dec. 31, 2017		Dec. 31, 2016
To Be Announced Securities [Line Items]
Investments Fair Value	$ 2,071,707		$ 1,505,026
Financial Instruments Sold, Not yet Purchased, at Fair Value	(642,240)		(584,896)
Payable for securities purchased	(202,703)		(85,168)
To Be Announced Fixed Rate Agency Securities [Member]
To Be Announced Securities [Line Items]
Investments Fair Value	123,680	[1],[2],[3]	70,525	[4],[5],[6]
Investment Owned, Balance, Principal Amount	118,806		67,720
Receivable for securities sold	460,666		406,708
TBA - Fixed Rate Agency Securities Sold Short [Member]
To Be Announced Securities [Line Items]
Financial Instruments Sold, Not yet Purchased, at Fair Value	(460,189)	[2],[7]	(404,728)	[5],[8]
Investment Sold, Not yet Purchased, Balance, Principal Amount	(442,197)		(384,155)
Payable for securities purchased	(123,918)		(70,347)
Investment Owned At Fair Value, Net	$ (336,509)		$ (334,203)
[1]	At December 31, 2017, the Company's long investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 72.39%, 42.86%, and 45.07% of Total Equity, respectively.
[2]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[3]	The table below shows the ratings on the Company's long investments from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 160.32%A/A/A 0.81%Baa/BBB/BBB 2.62%Ba/BB/BB or below 68.03%Unrated 101.85%
[4]	At December 31, 2016, the Company's long investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 73.78%, 42.13%, and 23.36% of Total Equity, respectively.
[5]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[6]	The table below shows the Company's long investment ratings from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 139.27%Aaa/AAA/AAA 0.84%Aa/AA/AA 0.03%A/A/A 0.05%Baa/BBB/BBB 2.60%Ba/BB/BB or below 30.24%Unrated 60.39%
[7]	At December 31, 2017, the Company's short investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 44.61%, 19.27%, and 10.23% of Total Equity, respectively.
[8]	At December 31, 2016, the Company's short investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 32.67%, 22.21%, and 7.89% of Total Equity, respectively.

Financial Derivatives (Schedule

Financial Derivatives (Schedule Of Gains And Losses On Derivative Contracts) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Derivative [Line Items]
Foreign currency transactions		$ 3,845		$ (5,597)		$ (3,073)
Net Realized Gain/Loss on Financial Derivatives		(18,704)	[1]	(36,321)	[2]	(10,115)	[3]
Unrealized Gain (Loss) on Financial Derivatives		(317)	[4]	(6,494)	[5]	8,780	[6]
Foreign currency translation		4,326		3,643		(1,706)
Reimbursement from third party						1,500
Derivative [Member]
Derivative [Line Items]
Foreign currency transactions		(100)		300		200
Foreign currency translation		(200)		1,100		(1,100)
Credit Default Swaps On Asset Backed Securities [Member] | Credit Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		(601)	[1]	719	[2]	(3,066)	[3]
Unrealized Gain (Loss) on Financial Derivatives		(263)	[4]	(703)	[5]	2,133	[6]
Credit Default Swaps On Asset Backed Indices [Member] | Credit Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		(5,291)	[1]	3,935	[2]	(714)	[3]
Unrealized Gain (Loss) on Financial Derivatives		(817)	[4]	(3,349)	[5]	(285)	[6]
Credit Default Swaps On Corporate Bond Indices [Member] | Credit Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		(3,336)	[1]	(36,195)	[2]	(8,059)	[3]
Unrealized Gain (Loss) on Financial Derivatives		(459)	[4]	(4,044)	[5]	7,503	[6]
Credit Default Swaps On Corporate Bonds [Member] | Credit Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		205	[1]	(14)	[2]	(1,005)	[3]
Unrealized Gain (Loss) on Financial Derivatives		907	[4]	712	[5]	694	[6]
Total Return Swaps [Member] | Equity Market/Credit Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		(1,825)	[1]	(12,987)	[2]	1,838	[3]
Unrealized Gain (Loss) on Financial Derivatives		149	[4]	4,427	[5]	(4,564)	[6]
Interest Rate Swaps [Member] | Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		(1,171)	[1]	(2,912)	[2]	(9,603)	[3],[7]
Unrealized Gain (Loss) on Financial Derivatives		571	[4]	(1,983)	[5]	1,983	[6],[7]
Futures [Member] | Interest Rate/Currency Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives	[1]	(195)
Unrealized Gain (Loss) on Financial Derivatives	[4]	(423)
Futures [Member] | Interest Rates/Equity Market Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives				(84)	[2]	708	[3]
Unrealized Gain (Loss) on Financial Derivatives				456	[5]	(676)	[6]
Forwards [Member] | Currency risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		(6,390)	[1]	4,093	[2]	4,738	[3]
Unrealized Gain (Loss) on Financial Derivatives		(18)	[4]	(1,580)	[5]	377	[6]
Mortgage Loan Purchase Commitments [Member] | Interest Rate Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		0	[1]	0	[2]	0	[3]
Unrealized Gain (Loss) on Financial Derivatives		31	[4]	(23)	[5]	(8)	[6]
Options [Member] | Credit/Interest Rates/Equity Market risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		0	[1]	7,174	[2]	5,048	[3]
Unrealized Gain (Loss) on Financial Derivatives		10	[4]	(413)	[5]	$ 1,623	[6]
Warrant [Member] | Equity Market Risk [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives		(100)	[1]	(50)	[2]
Unrealized Gain (Loss) on Financial Derivatives		$ (5)	[4]	$ 6	[5]
[1]	Includes gain/(loss) on foreign currency transactions on derivatives in the amount of $(0.1) million, which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions.
[2]	Includes gain/(loss) on foreign currency transactions on derivatives in the amount of $0.3 million, which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions.
[3]	Includes foreign currency translation on derivatives in the amount of $0.2 million, which is included on the Consolidated Statement of Operations in Realized gain (loss) on foreign currency transactions.
[4]	Includes foreign currency translation on derivatives in the amount of $(0.2) million, which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation.
[5]	Includes foreign currency translation on derivatives in the amount of $1.1 million, which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation.
[6]	Includes foreign currency translation on derivatives in the amount of $(1.1) million, which is included on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation.
[7]	Includes a $1.5 million reimbursement from a third party.

Financial Derivatives Financial

Financial Derivatives Financial Derivatives (Schedule of Derivative Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Interest Rate Swaps [Member]
Derivative [Line Items]
Average Monthly Notional Amount	$ 1,306,853	$ 1,731,368
Credit Default Swap [Member]
Derivative [Line Items]
Average Monthly Notional Amount	531,008	1,586,923
Total Return Swaps [Member]
Derivative [Line Items]
Average Monthly Notional Amount	19,760	113,628
Futures [Member]
Derivative [Line Items]
Average Monthly Notional Amount	48,244	371,900
Options [Member]
Derivative [Line Items]
Average Monthly Notional Amount	94,415	357,260
Forwards [Member]
Derivative [Line Items]
Average Monthly Notional Amount	76,784	80,513
Warrant [Member]
Derivative [Line Items]
Average Monthly Notional Amount	378	1,640
Mortgage Loan Purchase Commitments [Member]
Derivative [Line Items]
Average Monthly Notional Amount	$ 1,585	$ 6,143

Financial Derivatives (Schedu57

Financial Derivatives (Schedule Of Credit Derivatives) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Credit Default Swap, Selling Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net		$ (4,770)	$ (1,551)
Notional value	[1]	177,588	117,476
Credit Default Swap, Buying Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net	[2]	(3,582)	4,552
Notional value	[2]	$ (88,400)	$ (68,357)
[1]	The notional value is the maximum amount that a seller of credit protection would be obligated to pay, and a buyer of credit protection would receive upon occurrence of a "credit event." Movements in the value of credit default swap transactions may require the Company or the counterparty to post or receive collateral. Amounts due or owed under credit derivative contracts with an International Swaps and Derivatives Association, or "ISDA," counterparty may be offset against amounts due or owed on other credit derivative contracts with the same ISDA counterparty. As a result, the notional value of written credit derivatives involving a particular underlying reference asset or index has been reduced (but not below zero) by the notional value of any contracts where the Company has purchased credit protection on the same reference asset or index with the same ISDA counterparty.
[2]	Offsetting transactions with third parties include purchased credit derivatives which have the same reference obligation.

Financial Derivatives (Narrativ

Financial Derivatives (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Written credit derivative spread threshold	20.00%	20.00%
Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Credit Risk Derivative in Excess of Threshold, at Fair Value, Net	$ (0.4)	$ (2.5)
Total net up-front payments received	$ (5.5)	$ (3.3)
Minimum [Member]
Derivative [Line Items]
Low Range Of Spread On Written Credit Derivatives	0.154%	0.685%
Upfront points on written credit derivative in excess of threshold	51.4	45
Maximum [Member]
Derivative [Line Items]
Low Range Of Spread On Written Credit Derivatives	19.457%	6.366%
Upfront points on written credit derivative in excess of threshold	71.6	72.6

Securitization Transactions Nar

Securitization Transactions Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Securitization Transactions [Line Items]
Investments Fair Value		$ 2,071,707		$ 1,505,026
Participation in Multi-Seller Consumer Loan Securitization [Member]
Securitization Transactions [Line Items]
Aggregate unpaid principal balance of loans sold		$ 124,000
Company's share of loans sold		51.00%
Co-participants share of loans sold		49.00%
Gain (Loss) on Securitization of Financial Assets		$ (100)
Senior notes issued in securitization transaction		87,000
Subordinated notes issued in securitization transaction		$ 18,700
Company's initial percentage ownership of jointly owned entity		51.00%
Affiliated co-participants initial percentage ownership of jointly owned entity		49.00%
Company's current percentage ownership of jointly owned entity		75.00%
CLO I Securitization [Member]
Securitization Transactions [Line Items]
Gain (Loss) on Securitization of Financial Assets		$ 200
Notes issued by CLO securitization		$ 373,600
Percentage of unsecured subordinated notes purchased		25.00%
Principal amount of notes purchased from related party CLO securitization		$ 36,600
Cost of notes purchased from related party CLO securitization		$ 35,900
Percentage non-controlling ownership of related party		25.00%
Minimum economic interest required to be retained		5.00%
Economic interest retained		6.00%
CLO II Securitization [Member]
Securitization Transactions [Line Items]
Principal amount of notes purchased from related party CLO securitization		$ 18,200
Cost of notes purchased from related party CLO securitization		16,600
Loan receivable from related party		16,900
The Company [Member] | CLO I Securitization [Member]
Securitization Transactions [Line Items]
Corporate loans transferred into CLO securitization		62,000
Affiliated Entity [Member] | CLO I Securitization [Member]
Securitization Transactions [Line Items]
Corporate loans transferred into CLO securitization		141,700
Collateralized Loan Obligations [Member]
Securitization Transactions [Line Items]
Investments Fair Value		210,816	[1],[2]	44,956	[3],[4]
Collateralized Loan Obligations [Member] | CLO I Securitization [Member]
Securitization Transactions [Line Items]
Investments Fair Value	[1],[2],[5]	24,300
Collateralized Loan Obligations [Member] | CLO II Securitization [Member]
Securitization Transactions [Line Items]
Investments Fair Value	[1],[2],[5]	13,400
Corporate Equity Investments [Member]
Securitization Transactions [Line Items]
Investments Fair Value		37,465	[1],[2]	$ 33,788	[3],[4],[6]
Corporate Equity Investments [Member] | CLO I Securitization [Member]
Securitization Transactions [Line Items]
Investments Fair Value	[1],[2],[7]	$ 5,000
Non-QM loan securitization [Member]
Securitization Transactions [Line Items]
Economic interest retained		5.10%
Notes issued by non-QM securitization trust		$ 141,200
Cost of notes purchased from securitization trust		$ 700
Threshold for exercising Optional Redemption		30.00%
Percentage used to calculate servicing administrator fee		0.03%
Non-QM loan securitization [Member] | The Company [Member]
Securitization Transactions [Line Items]
Non-QM loans transferred into securitization trust		$ 141,200
[1]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[2]	The table below shows the ratings on the Company's long investments from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 160.32%A/A/A 0.81%Baa/BBB/BBB 2.62%Ba/BB/BB or below 68.03%Unrated 101.85%
[3]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[4]	The table below shows the Company's long investment ratings from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 139.27%Aaa/AAA/AAA 0.84%Aa/AA/AA 0.03%A/A/A 0.05%Baa/BBB/BBB 2.60%Ba/BB/BB or below 30.24%Unrated 60.39%
[5]	Includes investment in collateralized loan obligation notes in the amount of $37.7 million that were issued and are managed by related parties of the Company. See Note 9 to the Notes to Consolidated Financial Statements.
[6]	Conformed to current period presentation.
[7]	Represents the Company's investment in a related party. See Note 9 to the Notes to Consolidated Financial Statements.

Securitization Transactions Sch

Securitization Transactions Schedule of Assets and Liabilities attributable to Consolidated VIEs (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 47,233	$ 123,274	$ 183,909	$ 114,140
Investments Fair Value	2,071,707	1,505,026
Interest and dividends payable	5,904	3,460
Other secured borrowings, at fair value	125,105	0
Consolidated Entities [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	333	0
Investments Fair Value	132,424	0
Interest and dividends payable	333	0
Other secured borrowings, at fair value	$ 125,105	$ 0

Schedule of Reverse Repurchase

Schedule of Reverse Repurchase Agreements by Maturity (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Borrowings [Line Items]
Reverse repurchase agreements	[1]	$ 1,209,315	$ 1,033,581
Debt, Weighted Average Interest Rate		1.98%	1.32%
Remaining Days to Maturity, Reverse Repurchase Agreements		99 days	56 days
Agency residential mortgage-backed securities [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 829,624	$ 790,312
Debt, Weighted Average Interest Rate		1.51%	0.89%
Remaining Days to Maturity, Reverse Repurchase Agreements		44 days	41 days
Agency residential mortgage-backed securities [Member] | Maturity up to 30 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 287,014	$ 405,725
Debt, Weighted Average Interest Rate		1.43%	0.83%
Remaining Days to Maturity, Reverse Repurchase Agreements		15 days	18 days
Agency residential mortgage-backed securities [Member] | Maturity 31 to 60 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 264,058	$ 195,288
Debt, Weighted Average Interest Rate		1.47%	0.94%
Remaining Days to Maturity, Reverse Repurchase Agreements		46 days	45 days
Agency residential mortgage-backed securities [Member] | Maturity 61 to 90 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 277,950	$ 149,965
Debt, Weighted Average Interest Rate		1.63%	0.97%
Remaining Days to Maturity, Reverse Repurchase Agreements		74 days	74 days
Agency residential mortgage-backed securities [Member] | Maturity 91 to 120 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 0	$ 8,240
Debt, Weighted Average Interest Rate		0.00%	0.83%
Remaining Days to Maturity, Reverse Repurchase Agreements		0 days	102 days
Agency residential mortgage-backed securities [Member] | Maturity 121 to 150 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 0	$ 11,798
Debt, Weighted Average Interest Rate		0.00%	0.96%
Remaining Days to Maturity, Reverse Repurchase Agreements		0 days	131 days
Agency residential mortgage-backed securities [Member] | Maturity 151 to 180 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 602	$ 19,296
Debt, Weighted Average Interest Rate		2.56%	1.05%
Remaining Days to Maturity, Reverse Repurchase Agreements		158 days	164 days
US Treasury Securities [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 297	$ 5,428
Debt, Weighted Average Interest Rate		1.70%	0.91%
Remaining Days to Maturity, Reverse Repurchase Agreements		2 days	4 days
US Treasury Securities [Member] | Maturity up to 30 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 297	$ 5,428
Debt, Weighted Average Interest Rate		1.70%	0.91%
Remaining Days to Maturity, Reverse Repurchase Agreements		2 days	4 days
Credit [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 379,394	$ 237,841
Debt, Weighted Average Interest Rate		3.00%	2.75%
Remaining Days to Maturity, Reverse Repurchase Agreements		219 days	105 days
Credit [Member] | Maturity up to 30 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 37,433	$ 94,849
Debt, Weighted Average Interest Rate		2.61%	2.55%
Remaining Days to Maturity, Reverse Repurchase Agreements		13 days	16 days
Credit [Member] | Maturity 31 to 60 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 132,201	$ 26,974
Debt, Weighted Average Interest Rate		2.44%	2.36%
Remaining Days to Maturity, Reverse Repurchase Agreements		49 days	47 days
Credit [Member] | Maturity 61 to 90 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 130,875	$ 41,522
Debt, Weighted Average Interest Rate		2.75%	2.43%
Remaining Days to Maturity, Reverse Repurchase Agreements		77 days	77 days
Credit [Member] | Maturity 91 to 120 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 0	$ 10,084
Debt, Weighted Average Interest Rate		0.00%	2.91%
Remaining Days to Maturity, Reverse Repurchase Agreements		0 days	97 days
Credit [Member] | Maturity 121 to 150 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 8,551	$ 1,239
Debt, Weighted Average Interest Rate		3.79%	2.73%
Remaining Days to Maturity, Reverse Repurchase Agreements		128 days	124 days
Credit [Member] | Maturity 151 to 180 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 8,300	$ 12,616
Debt, Weighted Average Interest Rate		3.40%	3.17%
Remaining Days to Maturity, Reverse Repurchase Agreements		164 days	165 days
Credit [Member] | Maturity 181 to 360 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 5,090	$ 50,557
Debt, Weighted Average Interest Rate		3.59%	3.46%
Remaining Days to Maturity, Reverse Repurchase Agreements		280 days	316 days
Credit [Member] | Maturity greater than 360 days [Member]
Borrowings [Line Items]
Reverse repurchase agreements		$ 56,944	$ 0
Debt, Weighted Average Interest Rate		4.94%	0.00%
Remaining Days to Maturity, Reverse Repurchase Agreements		1094 days	0 days
[1]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.

Borrowings (Details)

Borrowings (Details) $ in Thousands		Aug. 18, 2017USD ($)	Dec. 31, 2017USD ($)counterparties	Dec. 31, 2016USD ($)counterparties
Borrowings [Line Items]
Reverse repurchase agreements	[1]		$ 1,209,315	$ 1,033,581
Total secured borrowings			$ 1,392,000	$ 1,058,000
Number of Counterparties with Outstanding Reverse Repurchase Agreements | counterparties			23	21
Concentration Risk, Reverse Repurchase Agreements			19.00%	15.00%
Number Counterparties With Concentration Risk, Reverse Repurchase Agreements | counterparties			1	0
Investments held with dealers as collateral			$ 1,410,000	$ 1,150,000
Pledged Financial Instruments, Not Separately Reported, Securities For Repurchase Agreements Unsettled			$ 10,600	33,400
Repurchase Agreements amount at risk threshold			10.00%
Other secured borrowings			$ 57,909	$ 24,086
Minimum [Member]
Borrowings [Line Items]
Reverse Repurchase Agreements Maturity			30 days
Reverse Repurchase Agreements Remaining Terms			2 days	3 days
Reverse Repurchase Agreements Interest Rate			(1.25%)	0.60%
Maximum [Member]
Borrowings [Line Items]
Reverse Repurchase Agreements Maturity			180 days
Reverse Repurchase Agreements Remaining Terms			1094 days	320 days
Reverse Repurchase Agreements Interest Rate			4.94%	3.76%
Reverse Repurchase Agreements [Member]
Borrowings [Line Items]
Cash collateral posted for securities sold under agreements to repurchase	[2],[3]		$ 18,600	$ 39,200
Security Owned and Pledged as Collateral, Fair Value			1,300	2,700
Commercial mortgage loans and REO [Member]
Borrowings [Line Items]
Reverse repurchase agreements			56,900
Fair value of Assets Transfered and Accounted for as Secured Borrowings			42,000
Consumer Loan [Member]
Borrowings [Line Items]
Fair value of Assets Transfered and Accounted for as Secured Borrowings			89,700
Securitized Residential Mortgage Loans [Member]
Borrowings [Line Items]
Fair value of Assets Transfered and Accounted for as Secured Borrowings			132,400
Non-QM loan securitization [Member]
Borrowings [Line Items]
Other secured borrowings			$ 125,100
Effective interest rate on borrowing			2.89%
Secured borrowing facility collateralized by unsecured loan portfolio [Member]
Borrowings [Line Items]
Other secured borrowings			$ 57,900
Effective interest rate on borrowing			4.34%
Secured borrowing facility collateralized by commercial mortgage loans and REO [Member]
Borrowings [Line Items]
Other secured borrowings				$ 24,100
Senior Notes [Member]
Borrowings [Line Items]
Effective interest rate on borrowing			5.55%
Debt Instrument, Face Amount		$ 86,000
Proceeds from Debt, Net of Issuance Costs		$ 84,700
Debt Instrument, Interest Rate, Stated Percentage		5.25%
Debt Instrument, Maturity Date		Sep. 1, 2022
[1]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.
[2]	For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore, the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's reverse repurchase agreements and cash collateral pledged on the Company's financial derivative liabilities. Total financial instruments transferred or pledged as collateral on the Company's reverse repurchase agreements as of December 31, 2017 and 2016 were $1.41 billion and $1.16 billion, respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $6.4 million and $14.9 million, respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $16.6 million and $14.8 million, respectively.
[3]	When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above tables, the Company has made assumptions in allocating pledged or posted collateral among the various rows.

Borrowings Schedule of Debt Rep

Borrowings Schedule of Debt Repayments (Details) $ in Thousands	Dec. 31, 2017USD ($)
Reverse Repurchase Agreements [Member]
Debt Instrument [Line Items]
2018 Scheduled Repayment of Principal	$ 1,152,371	[1]
2019 Scheduled Repayment of Principal	0	[1]
2020 Scheduled Repayment of Principal	56,944	[1]
2021 Scheduled Repayment of Principal	0	[1]
2022 Scheduled Repayment of Principal	0	[1]
Total Scheduled Repayment of Principal	1,209,315	[1]
Other secured borrowings [Member]
Debt Instrument [Line Items]
2018 Scheduled Repayment of Principal	42,409	[2]
2019 Scheduled Repayment of Principal	140,608	[2]
2020 Scheduled Repayment of Principal	0	[2]
2021 Scheduled Repayment of Principal	0	[2]
2022 Scheduled Repayment of Principal	0	[2]
Total Scheduled Repayment of Principal	183,017	[2]
Senior Notes [Member]
Debt Instrument [Line Items]
2018 Scheduled Repayment of Principal	0	[1]
2019 Scheduled Repayment of Principal	0	[1]
2020 Scheduled Repayment of Principal	0	[1]
2021 Scheduled Repayment of Principal	0	[1]
2022 Scheduled Repayment of Principal	86,000	[1]
Total Scheduled Repayment of Principal	86,000	[1]
Total Borrowings [Member]
Debt Instrument [Line Items]
2018 Scheduled Repayment of Principal	1,194,780
2019 Scheduled Repayment of Principal	140,608
2020 Scheduled Repayment of Principal	56,944
2021 Scheduled Repayment of Principal	0
2022 Scheduled Repayment of Principal	86,000
Total Scheduled Repayment of Principal	$ 1,478,332
[1]	Reflects the Company's contractual principal repayment dates.
[2]	Reflects the Company's expected principal repayment dates.

Income Taxes (Details)

Income Taxes (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Income Tax [Abstract]
Deferred Tax Assets, Deferred Income	$ 4
Valuation Allowances and Reserves, Balance	$ (4)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Effective Income Tax Rate as Result of Tax Reform Legislation	21.00%

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Related party transactions [Line Items]
Annual base management fee percentage														1.50%
Management fee description														The Operating Partnership pays the Manager 1.50% per annum of total equity of the Operating Partnership calculated in accordance with U.S. GAAP as of the end of each fiscal quarter (before deductions for base management fees and incentive fees payable with respect to such fiscal quarter), provided that total equity is adjusted to exclude one-time events pursuant to changes in U.S. GAAP, as well as non-cash charges after discussion between the Manager and the Company's independent directors, and approval by a majority of the Company's independent directors in the case of non-cash charges.
Base management fee to affiliate		$ 2,113	[1]	$ 2,161	[1]	$ 2,372	[1]	$ 2,410	[1]	$ 2,416	$ 2,485	$ 2,553	$ 2,611	$ 9,056	[2]	$ 10,065	[2]	$ 11,493	[2]
Incentive fee rate														25.00%
Incentive fees arrangement														The Manager is entitled to receive a quarterly incentive fee equal to the positive excess, if any, of (i) the product of (A) 25% and (B) the excess of (1) Adjusted Net Income (described below) for the Incentive Calculation Period (which means such fiscal quarter and the immediately preceding three fiscal quarters) over (2) the sum of the Hurdle Amounts (described below) for the Incentive Calculation Period, over (ii) the sum of the incentive fees already paid or payable for each fiscal quarter in the Incentive Calculation Period preceding such fiscal quarter. For purposes of calculating the incentive fee, "Adjusted Net Income" for the Incentive Calculation Period means the net increase in equity from operations of the Operating Partnership, after all base management fees but before any incentive fees for such period, and excluding any non-cash equity compensation expenses for such period, as reduced by any Loss Carryforward (as described below) as of the end of the fiscal quarter preceding the Incentive Calculation Period. For purposes of calculating the incentive fee, the "Loss Carryforward" as of the end of any fiscal quarter is calculated by determining the excess, if any, of (1) the Loss Carryforward as of the end of the immediately preceding fiscal quarter over (2) the Company's net increase in equity from operations (expressed as a positive number) or net decrease in equity from operations (expressed as a negative number) of the Operating Partnership for such fiscal quarter. As of December 31, 2017, there was no Loss Carryforward. For purposes of calculating the incentive fee, the "Hurdle Amount" means, with respect to any fiscal quarter, the product of (i) one-fourth of the greater of (A) 9% and (B) 3% plus the 10-year U.S. Treasury rate for such fiscal quarter, (ii) the sum of (A) the weighted average gross proceeds per share of all common share and OP Unit issuances since inception of the Company and up to the end of such fiscal quarter, with each issuance weighted by both the number of shares and OP Units issued in such issuance and the number of days that such issued shares and OP Units were outstanding during such fiscal quarter, using a first-in first-out basis of accounting (i.e. attributing any share and OP Unit repurchases to the earliest issuances first) and (B) the result obtained by dividing (I) retained earnings attributable to common shares and OP Units at the beginning of such fiscal quarter by (II) the average number of common shares and OP Units outstanding for each day during such fiscal quarter, (iii) the sum of the average number of common shares, LTIP Units, and OP Units outstanding for each day during such fiscal quarter. For purposes of determining the Hurdle Amount, issuances of common shares and OP Units (a) as equity incentive awards, (b) to the Manager as part of its base management fee or incentive fee and (c) to the Manager or any of its affiliates in privately negotiated transactions, are excluded from the calculation. The payment of the incentive fee will be in a combination of common shares and cash, provided that at least 10% of any quarterly payment will be made in common shares.
Termination Fee, Description														The Management Agreement requires the Company to pay a termination fee to the Manager in the event of (1) the Company's termination or non-renewal of the Management Agreement without cause or (2) the Company's termination of the Management Agreement based on unsatisfactory performance by the Manager that is materially detrimental to the Company (3) the Manager's termination of the Management Agreement upon a default by the Company in the performance of any material term of the Management Agreement. Such termination fee will be equal to the amount of three times the sum of (i) the average annual Quarterly Base Management Fee Amounts paid or payable with respect to the two 12-month periods ending on the last day of the latest fiscal quarter completed on or prior to the date of the notice of termination or non-renewal and (ii) the average annual Quarterly Incentive Fee Amounts paid or payable with respect to the two 12-month periods ending on the last day of the latest fiscal quarter completed on or prior to the date of the notice of termination or non-renewal.
Incentive fee hurdle rate fixed														9.00%
Incentive fee hurdle rate floating														3.00%
Minimum percentage of incentive fee to be paid in share														10.00%
Expense Reimbursement Period														60 days
Expense Reimbursement - Manager														$ 6,400		6,500		5,100
Investments Fair Value		2,071,707								1,505,026				2,071,707		1,505,026
Non-controlling interests		20,862								7,116				20,862		7,116
Other secured borrowings		57,909								24,086				57,909		24,086
Reverse repurchase agreements	[3]	1,209,315								1,033,581				1,209,315		1,033,581
Fair value repurchase agreements	[3]	155,949								184,819				155,949		184,819
Investments held with dealers as collateral		1,410,000								1,150,000				1,410,000		1,150,000
Management fee rebate		160		$ 172		$ 0		$ 0						332	[2]	0	[2]	$ 0	[2]
Secured borrowing facility collateralized by commercial mortgage loans and REO [Member]
Related party transactions [Line Items]
Other secured borrowings										24,100						24,100
Commercial mortgage loans and REO [Member]
Related party transactions [Line Items]
Investments Fair Value	[4],[5],[6],[7]	27,900												27,900
Reverse repurchase agreements		56,900												56,900
Mortgage Originator [Member]
Related party transactions [Line Items]
Warehouse facility, monetary amount		$ 5,000												$ 5,000
Line of Credit Facility, Interest Rate at Period End		15.00%												15.00%
Advances made under warehouse facility		$ 0												$ 0
Related Party-Consumer Loans Titled in Name of Related Party [Member]
Related party transactions [Line Items]
Fair value of loans held in related party trust		11,700								7,600				11,700		7,600
Purchasing Entity [Member]
Related party transactions [Line Items]
Fair value of loans held in related party trust		114,500								43,200				114,500		43,200
Purchase commitment principal balance														102,600
Estimated remaining contingent purchase obligations		163,300												163,300
Residential mortgage loans and REO [Member]
Related party transactions [Line Items]
Fair value of loans held in related party trust		183,100								$ 86,000				183,100		$ 86,000
Non-controlling interest of joint venture partner [Member] | Unrelated third party joint venture interest [Member] | Commercial mortgage loans and REO [Member]
Related party transactions [Line Items]
Non-controlling interests		1,800												1,800
Non-controlling interest of joint venture partner [Member] | Related party joint venture interest [Member] | Commercial mortgage loans and REO [Member]
Related party transactions [Line Items]
Non-controlling interests		5,300												5,300
Participation in multi-borrower financing facility [Member]
Related party transactions [Line Items]
Outstanding debt of related party		106,600												106,600
Due from Related Parties		23,400												23,400
Participation in Multi-Seller Consumer Loan Securitization [Member] | Repurchase Agreements [Member] | Acquiror Repurchase Agreement [Member]
Related party transactions [Line Items]
Fair value repurchase agreements		5,700												5,700
Investments held with dealers as collateral	[8],[9],[10]	$ 9,400												$ 9,400
[1]	Net of management fee rebate of $0.2 million for the each of the three month periods ended September 30, 2017 and December 31, 2017, respectively. See Note 9 for further details on management fee rebates.(2)For th
[2]	See Note 9 for further details on management fee rebates.
[3]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.
[4]	Includes non-performing commercial loans in the amount of $23.9 million whereby principal and/or interest is past due and a maturity date is not applicable.
[5]	Loans and real estate owned are beneficially owned by the Company through participation certificates in the various trusts that hold such investments. See Note 9 to the Notes to Consolidated Financial Statements.
[6]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[7]	The table below shows the ratings on the Company's long investments from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 160.32%A/A/A 0.81%Baa/BBB/BBB 2.62%Ba/BB/BB or below 68.03%Unrated 101.85%
[8]	In general, securities received pursuant to repurchase agreements were delivered to counterparties in short sale transactions.
[9]	Repurchase agreement is between the Company and CILO 2016-LD1 Holdings LLC, an entity in which the Company has a beneficial interest and is co-owned by an affiliate of Ellington Management Group, L.L.C. CILO 2016-LD1 Holdings LLC owns subordinated notes issued by, as well as trust certificates representing ownership of, a securitization trust. See Note 9 to the Notes to Consolidated Financial Statements.
[10]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.

Long-Term Incentive Plan Unit66

Long-Term Incentive Plan Units (Narrative) (Details) - USD ($) $ in Thousands	Dec. 12, 2017	Sep. 12, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance			1,907,769
Share-based long term incentive plan unit expense			$ 385	$ 400	$ 393
Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period			24,421	22,076	22,571
Director [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period		10,002
Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period	14,419
Vest December 12, 2018 [Member] | Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period	8,533
Vest December 12, 2019 [Member] | Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Unit Grants in Period	5,886

Long-Term Incentive Plan Unit67

Long-Term Incentive Plan Units Long-Term Incentive Plan Units (Unvested LTIP Units) (Details) - Long-Term Incentive Plan Units [Member]	12 Months Ended
	Dec. 31, 2017shares
Schedule of Unvested LTIP Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Unvested	30,004
Director [Member]
Schedule of Unvested LTIP Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Unvested	10,002
LTIP Unit, Grant Date	Sep. 12, 2017
LTIP Unit, Vesting Date	Sep. 11, 2018	[1]
Vest December 12, 2018 [Member] | Dedicated or partially dedicated personnel [Member]
Schedule of Unvested LTIP Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Unvested	8,533
LTIP Unit, Grant Date	Dec. 12, 2017
LTIP Unit, Vesting Date	Dec. 12, 2018	[1]
Vest December 12, 2019 [Member] | Dedicated or partially dedicated personnel [Member]
Schedule of Unvested LTIP Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Unvested	5,886
LTIP Unit, Grant Date	Dec. 12, 2017
LTIP Unit, Vesting Date	Dec. 12, 2019	[1]
Vest December 13, 2018 [Member] | Dedicated or partially dedicated personnel [Member]
Schedule of Unvested LTIP Units [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Unvested	5,583
LTIP Unit, Grant Date	Dec. 13, 2016
LTIP Unit, Vesting Date	Dec. 13, 2018	[1]
[1]	Date at which such LTIP Units will vest and become non-forfeitable.

Long-Term Incentive Plan Unit68

Long-Term Incentive Plan Units (Roll-Forward Of Company's LTIP Units Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Director LTIP Units exercised	(2,801)	(2,475)	(1,947)
Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	469,539	449,938	429,314
Granted	24,421	22,076	22,571
Director LTIP Units exercised	(2,801)	(2,475)	(1,947)
LTIP Units Outstanding, end of period	491,159	469,539	449,938
LTIP Units Vested and Outstanding	461,155	440,828	421,120
Manager [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	375,000	375,000	375,000
Granted	0	0	0
Director LTIP Units exercised	0	0	0
LTIP Units Outstanding, end of period	375,000	375,000	375,000
LTIP Units Vested and Outstanding	375,000	375,000	375,000
Non-Manager [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	94,539	74,938	54,314
Granted	24,421	22,076	22,571
Director LTIP Units exercised	(2,801)	(2,475)	(1,947)
LTIP Units Outstanding, end of period	116,159	94,539	74,938
LTIP Units Vested and Outstanding	86,155	65,828	46,120

Non-controlling Interests (Deta

Non-controlling Interests (Details) - USD ($) $ in Thousands	Jan. 02, 2013	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest		$ 7,116	$ 20,862
Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest		$ 7,116	20,862	$ 6,903	$ 6,389
Non-controlling interest in Operating Partnership [Member] | Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Operating Partnership Units Issued	212,000
Operating Partnership Units		212,000
Noncontrolling Interest in Operating Partnerships		$ 4,100	$ 4,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			0.70%
Non-controlling interest of joint venture partner [Member] | Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest		$ 3,000	$ 16,700

Common Share Capitalization (Na

Common Share Capitalization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 06, 2017
Common Stock Capitalization [Line Items]
Dividends declared (in usd per share)	$ 1.76	$ 1.95	$ 2.45
Payments of Dividends	$ (57,636)	$ (65,148)	$ (83,460)
Common Shares Issued And Outstanding Upon Conversion of All Convertible Securities	32,039,097	32,976,242	33,787,950
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				1,700,000
Shares repurchased	961,566	833,784	325,613
Stock Repurchased and Retired During Period, Value	$ 14,642	$ 14,028	$ 5,639
Stock Repurchases, Average Price Per Share	$ 15.23

Common Share Capitalization (Su

Common Share Capitalization (Summary Of Common Shares Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Shares Outstanding, period begin	32,294,703	33,126,012	33,449,678
Shares repurchased	(961,566)	(833,784)	(325,613)
Director LTIP Units exercised	2,801	2,475	1,947
Common Shares Outstanding, period end	31,335,938	32,294,703	33,126,012

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net increase (decrease) in shareholders' equity resulting from operations
Net Income (Loss) Attributable to Parent		$ 7,444	$ 6,195	$ 5,064	$ 15,278	$ 1,692	$ 516	$ 4,985	$ (23,200)	$ 33,981	$ (16,007)	$ 38,089
Net Income (Loss) Attributable to Participating Non-controlling Interest	[1]									221	(101)	239
Net income (loss) attributable to parent and participating non-controlling interest										34,202	(16,108)	38,328
Dividends Paid:
Dividends	[2],[3]									(57,636)	(65,148)	(83,460)
Undistributed (Distributed in excess of) earnings:
Total undistributed (distributed in excess of) earnings										$ (23,434)	$ (81,256)	$ (45,132)
Basic earnings per common share:
Distributed (in usd per share)										$ 1.76	$ 1.95	$ 2.45
Undistributed (Distributed in excess of) (in usd per share)										(0.72)	(2.43)	(1.32)
Basic earnings per common share (in usd per share)										1.04	(0.48)	1.13
Diluted earnings per common share:
Distributed (in usd per share)										1.76	1.95	2.45
Undistributed (Distributed in excess of) (in usd per share)										(0.72)	(2.43)	(1.32)
Diluted earnings per common share (in usd per share)										$ 1.04	$ (0.48)	$ 1.13
Net Income (Loss) Attributable to Non-Participating Non-controlling Interest										$ 1,800	$ 400	$ 100
Common Stock [Member]
Net increase (decrease) in shareholders' equity resulting from operations
Net Income (Loss) Attributable to Parent										33,487	(15,789)	37,604
Dividends Paid:
Dividends	[3]									(56,434)	(63,855)	(81,886)
Undistributed (Distributed in excess of) earnings:
Total undistributed (distributed in excess of) earnings										$ (22,947)	$ (79,644)	$ (44,282)
Weighted average shares outstanding (basic and diluted):
Weighted Average Number of Shares Outstanding, Basic and Diluted										32,062,091	32,758,050	33,422,053
Long-Term Incentive Plan Units [Member]
Net increase (decrease) in shareholders' equity resulting from operations
Net Income (Loss) Attributable to Parent										$ 494	$ (218)	$ 485
Dividends Paid:
Dividends	[3]									(829)	(880)	(1,054)
Undistributed (Distributed in excess of) earnings:
Total undistributed (distributed in excess of) earnings										$ (335)	$ (1,098)	$ (569)
Weighted average shares outstanding (basic and diluted):
Weighted Average Number of Shares Outstanding, Basic and Diluted										472,527	452,436	431,640
Noncontrolling Interest [Member]
Dividends Paid:
Dividends	[3]									$ (373)	$ (413)	$ (520)
Undistributed (Distributed in excess of) earnings:
Total undistributed (distributed in excess of) earnings										$ (152)	$ (514)	$ (281)
Weighted average shares outstanding (basic and diluted):
Weighted Average Number of Shares Outstanding, Basic and Diluted										212,000	212,000	212,000
[1]	For the years ended December 31, 2017, 2016, and 2015, excludes net increase in equity resulting from operations of $1.8 million, $0.4 million, and $0.1 million, respectively attributable to joint venture partners, which have non-participating interests as described in Note 11.
[2]	For the years ended December 31, 2017, 2016, and 2015, dividends totaling $1.76, $1.95, and $2.45, respectively, per common share and convertible unit outstanding, were declared and paid.
[3]	The Company pays quarterly dividends in arrears, so a portion of the dividends paid in each calendar year relate to the prior year's earnings.

Counterparty Risk (Narrative) (

Counterparty Risk (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Investments held with dealers as collateral	$ 1,410,000	$ 1,150,000
Pledged Financial Instruments, Not Separately Reported, Securities For Repurchase Agreements Unsettled	10,600	33,400
Unencumbered investments held in custody	61,300
Cash and cash equivalents	$ 47,233	$ 123,274	$ 183,909	$ 114,140
Concentration risk threshold	15.00%

Counterparty Risk (% Of Total C

Counterparty Risk (% Of Total Collateral On Reverse Repurchase Agreements) (Details)	Dec. 31, 2017
Royal Bank of Canada [Member]
Concentration Risk [Line Items]
Percentage of Total Collateral On Reverse Repurchase Agreements	18.00%

Counterparty Risk (% Of Due fro

Counterparty Risk (% Of Due from Brokers) (Details)	Dec. 31, 2017
Morgan Stanley [Member]
Concentration Risk [Line Items]
% of Total Due from Brokers	35.00%
BNP Paribas Securities Corp. [Member]
Concentration Risk [Line Items]
% of Total Due from Brokers	24.00%
J.P. Morgan Securities LLC [Member]
Concentration Risk [Line Items]
% of Total Due from Brokers	17.00%

Counterparty Risk (% Of Total R

Counterparty Risk (% Of Total Receivable For Securities Sold) (Details)	Dec. 31, 2017
Bank of America Securities [Member]
Concentration Risk [Line Items]
% of Total Receivable for Securities Sold	28.00%
Nomura Securities International Inc. [Member]
Concentration Risk [Line Items]
% of Total Receivable for Securities Sold	26.00%

Counterparty Risk (Cash and Cas

Counterparty Risk (Cash and Cash Equivalents) (Details)	Dec. 31, 2017	Dec. 31, 2016
BlackRock Liquidity Funds FedFund Portfolio, Institutional Class Shares [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	56.00%	41.00%
Bank of New York Mellon Corporation [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	37.00%	27.00%
Deutsche Bank Securities [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	5.00%	0.00%
Bank of America Securities [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	2.00%	0.00%
Goldman Sachs Financial Square Funds - Government Fund [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	0.00%	16.00%
Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	0.00%	16.00%

Schedule of Restricted Cash (De

Schedule of Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash [Line Items]
Restricted cash	$ 425	$ 655
Minimum Required Regulatory Balance [Member]
Restricted Cash [Line Items]
Restricted cash	250	250
Letter of Credit [Member]
Restricted Cash [Line Items]
Restricted cash	0	230
Flow purchase and sale agreement [Member]
Restricted Cash [Line Items]
Restricted cash	$ 175	$ 175

Offsetting of Assets and Liab79

Offsetting of Assets and Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2017		Dec. 31, 2016
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value-	[1]	$ 28,165		$ 35,595
Fair value repurchase agreements	[1]	155,949		184,819
Derivative Liabilities	[1]	(36,273)		(18,687)
Reverse repurchase agreements	[1]	(1,209,315)		(1,033,581)
Derivative Liability, Not Offset, Policy Election Deduction		(18,708)		(15,082)
Securities Sold under Agreements to Repurchase, Not Offset, Policy Election Deduction		(155,949)		(184,819)
Derivative Asset, Not Offset, Policy Election Deduction		18,708		15,082
Securities Purchased under Agreements to Resell, Not Offset, Policy Election Deduction		155,949		184,819
Derivative, Collateral, Obligation to Return Cash	[2],[3]	(1,720)		(7,933)
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash	[2],[3]	0		0
Derivative, Collateral, Right to Reclaim Cash	[2],[3]	17,565		3,574
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	[2],[3]	18,558		39,189
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election		7,737		12,580
Securities Purchased under Agreements to Resell, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election		0		0
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election		0		(31)
Securities Sold under Agreements to Repurchase, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election		0		0
Securities Collateral relating to Reverse Repurchase Agreements		1,410,000		1,160,000
Financial Derivatives - Assets [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value-		28,165	[4]	35,595	[5]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2],[3]	0		0
Excess cash collateral		6,400		14,900
Repurchase Agreements [Member]
Offsetting of Assets and Liabilities [Line Items]
Fair value repurchase agreements		155,949	[4],[6]	184,819	[5],[7]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2],[3]	0		0
Financial Derivatives - Liabilities [Member]
Offsetting of Assets and Liabilities [Line Items]
Derivative Liabilities		(36,273)	[4]	(18,687)	[5]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2],[3]	0		0
Excess cash collateral		16,600		14,800
Reverse Repurchase Agreements [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	[2],[3]	$ 1,034,808		$ 809,573
[1]	In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.
[2]	For the purpose of this presentation, for each row the total amount of financial instruments transferred or pledged and cash collateral (received) or pledged may not exceed the applicable gross amount of assets or (liabilities) as presented here. Therefore, the Company has reduced the amount of financial instruments transferred or pledged as collateral related to the Company's reverse repurchase agreements and cash collateral pledged on the Company's financial derivative liabilities. Total financial instruments transferred or pledged as collateral on the Company's reverse repurchase agreements as of December 31, 2017 and 2016 were $1.41 billion and $1.16 billion, respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $6.4 million and $14.9 million, respectively. As of December 31, 2017 and 2016, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $16.6 million and $14.8 million, respectively.
[3]	When collateral is pledged to or pledged by a counterparty, it is often pledged or posted with respect to all positions with such counterparty, and in such cases such collateral cannot be specifically identified as relating to a specific asset or liability. As a result, in preparing the above tables, the Company has made assumptions in allocating pledged or posted collateral among the various rows.
[4]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[5]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[6]	In general, securities received pursuant to repurchase agreements were delivered to counterparties in short sale transactions.
[7]	In general, securities received pursuant to repurchase agreements were delivered to counterparties in short sale transactions.

Commitments And Contingencies C

Commitments And Contingencies Commitments and Contingencies (Details)	Dec. 31, 2017USD ($)
Related Party B [Member] | Non-Exchange Traded Equity Investment in Mortgage Originator
Other Commitments [Line Items]
Guaranty Liabilities	$ 30,000,000
Related party mortgage originator (with flow mortgage loan purchase and sale agreement) [Member] | Non-Exchange Traded Equity Investment in Mortgage Originator
Other Commitments [Line Items]
Drawn down amount being guaranteed	21,200,000
Guarantor Obligations, Current Carrying Value	0
Related party mortgage originator (with no flow mortgage loan purchase and sale agreement) [Member]
Other Commitments [Line Items]
Capital commitment	$ 2,500,000

Financial Highlights (Narrative

Financial Highlights (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Company, Financial Highlights [Abstract]
Market Based Total Return	4.35%	3.50%	(4.56%)

Financial Highlights (Results O

Financial Highlights (Results Of Operations For A Share Outstanding) (Details) - $ / shares		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) Equity Per Share [Roll Forward]
Beginning Shareholders' Equity Per Share (12/31/2016, 12/31/2015, and 12/31/2014, respectively)		$ 19.75	[1]	$ 22.10	[1]	$ 23.38
Net Investment Income		1.10		1.09		1.98
Net Realized/Unrealized Gains (Losses)		0.02		(1.57)		(0.83)
Results of Operations Attributable to Equity		1.12		(0.48)		1.15
Less: Results of Operations Attributable to Non-controlling Interests		(0.06)		(0.01)		(0.01)
Results of Operations Attributable to Shareholders' Equity	[2]	1.06		(0.49)		1.14
Dividends Paid to Common Shareholders		(1.76)		(1.95)		(2.45)
Weighted Average Share Impact on Dividends Paid	[3]	(0.04)		(0.04)		(0.05)
Accretive (Dilutive) Effect of Share Issuances (Net of Offering Costs), Share Repurchases, and Adjustments to Non-controlling Interest		0.14		0.13		0.08
Ending Shareholders' Equity Per Share (12/31/2017, 12/31/2016 and 12/31/2015, respectively)	[1]	$ 19.15		$ 19.75		$ 22.10
Shares Outstanding, end of period		31,335,938		32,294,703		33,126,012	33,449,678
Shareholders Equity Per Share Upon Conversion Of All Convertible Units (in usd per share)		$ 18.85		$ 19.46		$ 21.80
[1]	If all LTIP Units and OP Units previously issued were vested and exchanged for common shares as of December 31, 2017, 2016, and 2015, shareholders' equity per share would be $18.85, $19.46, and $21.80, respectively.
[2]	Calculated based on average common shares outstanding and can differ from the calculation for EPS (See Note 13).
[3]	Per share impact on dividends paid relating to share issuances/repurchases during the period as well as dividends paid to LTIP and OP Unit holders.

Financial Highlights (Net Asset

Financial Highlights (Net Asset Value Based Total Return For A Shareholder) (Details)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Company, Financial Highlights [Abstract]
Total Return	[1]	6.14%	(1.83%)	5.14%
[1]	Total return is calculated assuming reinvestment of distributions at shareholders' equity per share during the period.

Financial Highlights (Net Inves

Financial Highlights (Net Investment Income Ratio To Average Equity) (Details)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Company, Financial Highlights [Abstract]
Net Investment Income (Loss) Ratio	[1]	5.51%	5.22%	8.59%
[1]	Average equity is calculated using month end values.

Financial Highlights (Expense R

Financial Highlights (Expense Ratios To Average Equity) (Details)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Company, Financial Highlights [Abstract]
Operating expenses, before interest expense and other investment related expenses	[1]	(2.81%)	(2.93%)	(2.69%)
Interest expense and other investment related expenses	[1]	(6.41%)	(3.56%)	(2.30%)
Total Expenses	[1]	(9.22%)	(6.49%)	(4.99%)
[1]	Average equity is calculated using month end values.

Condensed Quarterly Financial86

Condensed Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
INVESTMENT INCOME
Interest income	$ 23,810		$ 21,145		$ 21,788		$ 22,886		$ 18,265	$ 16,662	$ 18,990	$ 20,427	$ 89,629		$ 74,344		$ 101,783
Other income	1,288		1,232		872		939		2,342	807	1,024	1,668	4,331		5,841		2,813
Total investment income	25,098		22,377		22,660		23,825		20,607	17,469	20,014	22,095	93,960		80,185		104,596
EXPENSES
Base management fee to affiliate	2,113	[1]	2,161	[1]	2,372	[1]	2,410	[1]	2,416	2,485	2,553	2,611	9,056	[2]	10,065	[2]	11,493	[2]
Interest expense	9,326		8,166		7,625		6,003		4,461	4,143	4,234	3,468	31,120		16,306		12,112
Other investment related expenses	4,267		1,908		2,058		1,521		2,062	2,068	2,191	1,749
Other operating expenses	2,333		2,240		2,173		2,116		2,640	2,379	2,515	2,445
Total expenses	18,039		14,475		14,228		12,050		11,579	11,075	11,493	10,273	58,792		44,420		38,420
NET INVESTMENT INCOME	7,059		7,902		8,432		11,775		9,028	6,394	8,521	11,822	35,168		35,765		66,176
NET REALIZED AND CHANGE IN NET UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY TRANSACTIONS/TRANSLATION
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions	(5,831)		1,205		(5,347)		(831)		(2,242)	(23,020)	(2,331)	(11,940)	(10,804)		(39,533)		20,953
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation	6,970		(2,512)		2,356		4,786		(4,854)	17,176	(1,188)	(23,068)	11,600		(11,934)		(48,700)
Total Change in Net Unrealized Gain Loss On Investments, Financial derivatives, and Foreign currency translation	1,139		(1,307)		(2,991)		3,955		(7,096)	(5,844)	(3,519)	(35,008)	796		(51,467)		(27,747)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	8,198		6,595		5,441		15,730		1,932	550	5,002	(23,186)	35,964		(15,702)		38,429
Net Income (Loss) Attributable to Noncontrolling Interest	754		400		377		452		240	34	17	14	1,983		305		340
Net Income (Loss) Attributable to Parent	$ 7,444		$ 6,195		$ 5,064		$ 15,278		$ 1,692	$ 516	$ 4,985	$ (23,200)	$ 33,981		$ (16,007)		$ 38,089
NET INCREASE (DECREASE) IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS PER SHARE:
Basic and Diluted (in usd per share)	$ 0.23	[3]	$ 0.19	[3]	$ 0.16	[3]	$ 0.47	[3]	$ 0.05	$ 0.02	$ 0.15	$ (0.69)	$ 1.04		$ (0.48)		$ 1.13
Management fee rebate	$ 160		$ 172		$ 0		$ 0						$ 332	[2]	$ 0	[2]	$ 0	[2]
[1]	Net of management fee rebate of $0.2 million for the each of the three month periods ended September 30, 2017 and December 31, 2017, respectively. See Note 9 for further details on management fee rebates.(2)For th
[2]	See Note 9 for further details on management fee rebates.
[3]	For the year ended December 31, 2017 the sum of EPS for the four quarters of the year does not equal EPS as calculated for the entire year (see Note 13) as a result of changes in shares during the year due to repurchases of common share, as EPS is calculated using average shares outstanding during the period.

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 06, 2018	Mar. 09, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 06, 2017
Subsequent Event [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						1,700,000
Shares repurchased			961,566	833,784	325,613
Stock Repurchased and Retired During Period, Value			$ 14,642	$ 14,028	$ 5,639
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend Per Share	$ 0.41
Declared date	Feb. 6, 2018
Payment Date	Mar. 15, 2018
Record Date	Mar. 1, 2018
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	1,550,000
Shares repurchased		371,705
Stock Repurchased and Retired During Period, Value		$ 5,500