Ellington Financial (EFC) 10-Q 8 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	1-May-15
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	Ellington Financial LLC
Entity Central Index Key	1411342
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		33,449,678

Consolidated_Statement_Of_Asse

Consolidated Statement Of Assets, Liabilities And Equity (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, except Per Share data, unless otherwise specified
ASSETS
Cash and cash equivalents	$156,250		$114,140
Investments, financial derivatives, and repurchase agreements:
Investments, at fair value (Cost – $1,902,651 and $2,122,326)	1,950,943		2,172,082
Financial derivatives–assets, at fair value (Net cost – $78,599 and $61,560)	89,844	[1]	80,029	[1]
Repurchase agreements (Cost – $45,073 and $172,001)	44,754	[1]	172,001	[1]
Total investments, financial derivatives, and repurchase agreements	2,085,541		2,424,112
Due from brokers	112,763		146,965
Receivable for securities sold	1,230,339		1,237,592
Interest and principal receivable	15,635		20,611
Other assets	2,484		1,935
Total Assets	3,603,012		3,945,355
Investments and financial derivatives:
Investments sold short, at fair value (Proceeds – $1,193,569 and $1,290,091)	1,195,882		1,291,370
Financial derivatives–liabilities, at fair value (Net proceeds – $37,184 and $33,555)	67,667	[1]	66,116	[1]
Total investments and financial derivatives	1,263,549		1,357,486
Reverse repurchase agreements	1,396,112	[1]	1,669,433	[1]
Due to brokers	32,778		22,224
Payable for securities purchased	116,276		98,747
Securitized debt (Proceeds – $663 and $749)	669		774
Accounts payable and accrued expenses	3,218		2,798
Base management fee payable	2,953		2,963
Interest and dividends payable	2,020		2,386
Other Liabilities	13		0
Total Liabilities	2,817,588		3,156,811
Total Equity	785,424		788,544
TOTAL LIABILITIES AND EQUITY	3,603,012		3,945,355
ANALYSIS OF EQUITY:
Common shares, no par value, 100,000,000 shares authorized; (33,449,678 and 33,449,678 shares issued and outstanding)	770,051		772,811
Additional paid-in capital – LTIP units	9,440		9,344
Total Shareholders' Equity	779,491		782,155
Non-controlling interests	5,933		6,389
Total Equity	$785,424		$788,544
PER SHARE INFORMATION:
Common shares (in usd per share)	$23.30	[2]	$23.38
[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]	If all LTIP units and OP Units previously issued were vested and exchanged for common shares as of March 31, 2015 and 2014, shareholders' equity per share would be $23.01 and $24.10, respectively.

Consolidated_Statement_Of_Asse1

Consolidated Statement Of Assets, Liabilities And Equity (Parenthetical) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Investments at value, cost	$1,902,651	$2,122,326
Financial derivatives–assets, at fair value Net cost	78,599	61,560
Repurchase agreements, cost	45,073	172,001
Investments sold short at value, proceeds	-1,193,569	-1,290,091
Financial derivatives-liabilities, at fair value Net proceeds	-37,184	-33,555
Securitized debt proceeds	($663)	($749)
Common stock, par value
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	33,449,678	33,449,678
Common stock, shares outstanding	33,449,678	33,449,678

Consolidated_Condensed_Schedul

Consolidated Condensed Schedule Of Investments (Long Investments) (USD $)	3 Months Ended		12 Months Ended
Share data in Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Schedule of Investments [Line Items]
Fair Value	$1,950,943,000		$2,172,082,000
Investment Owned, at Cost	1,902,651,000		2,122,326,000
Percentage collaterallized by GNRCMO certificates	100.00%		100.00%
Non-performing loans, maturity date not applicable	15,000,000		11,300,000
Unrated But Agency-Guaranteed [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	148.77%		163.60%
Long Investment A Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	0.34%		0.98%
Long Investment BBB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	3.04%		5.62%
Long Investment BB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	64.24%		80.65%
Long Investment Unrated Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity	32.00%		24.61%
Principal And Interest - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	139.33%	[1],[2],[3],[4],[5]	147.82%	[1],[2],[6],[7],[8]
Fair Value	1,094,284,000	[2],[3],[4],[5]	1,165,642,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 35,973 Federal Home Loan Corporation Pool, 4.00% 2045-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	35,973,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2045-01	[2],[3],[4],[5]
Fair Value	38,928,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 24,949 Federal National Mortgage Association Pool, 3.50% 2042-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	24,949,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2042-10	[2],[3],[4],[5]
Fair Value	26,355,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 16,663 Federal National Mortgage Association Pool, 4.00% 2043-11
Schedule of Investments [Line Items]
Current Principal/Notional Amount	16,663,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2043-11	[2],[3],[4],[5]
Fair Value	18,147,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,071 Federal National Mortgage Association Pool, 4.00% 2043-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	15,071,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2043-11	[2],[3],[4],[5]
Fair Value	16,330,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 13,763 Federal National Mortgage Association Pool, 5.00% 2041-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	13,763,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	5.00%	[2],[3],[4],[5]
Maturity	2041-08	[2],[3],[4],[5]
Fair Value	15,341,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,938 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	11,938,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2043-08	[2],[3],[4],[5]
Fair Value	13,027,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,615 Federal Home Loan Mortgage Corporation Pool, 4.50% 2044-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	11,615,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-01	[2],[3],[4],[5]
Fair Value	12,965,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,740 Federal National Mortgage Association Pool, 3.50% 2045-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	11,740,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2045-03	[2],[3],[4],[5]
Fair Value	12,347,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,100 Government National Mortgage Association Pool, 3.50% 2045-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	11,100,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2045-04	[2],[3],[4],[5]
Fair Value	11,696,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,156 Federal Home Loan Mortgage Corporation Pool, 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	9,156,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2044-11	[2],[3],[4],[5]
Fair Value	9,654,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,110 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	8,110,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2043-08	[2],[3],[4],[5]
Fair Value	8,777,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,802 Federal Home Loan Mortgage Corporation Pool, 4.00% 2045-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	7,802,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2045-01	[2],[3],[4],[5]
Fair Value	8,371,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,934 Federal Home Loan Mortgage Corporation Pool, 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,934,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-10	[2],[3],[4],[5]
Fair Value	7,493,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,055 Federal Home Loan Mortgage Corporation Pool, 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	7,055,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2044-11	[2],[3],[4],[5]
Fair Value	7,438,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,804 Federal National Mortgage Association Pool, 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,804,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2042-11	[2],[3],[4],[5]
Fair Value	7,223,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,828 Federal Home Loan Mortgage Corporation Pool, 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,828,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2044-11	[2],[3],[4],[5]
Fair Value	7,198,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,407 Federal Home Loan Mortgage Corporation Pool, 4.50% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,407,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-02	[2],[3],[4],[5]
Fair Value	7,159,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,466 Federal National Mortgage Association Pool, 4.00% 2045-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,466,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2045-03	[2],[3],[4],[5]
Fair Value	6,932,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,010 Government National Mortgage Association Pool, 4.59% 2064-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,010,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.59%	[2],[3],[4],[5]
Maturity	2064-11	[2],[3],[4],[5]
Fair Value	6,888,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,395 Federal National Mortgage Association Pool, 3.50% 2028-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,395,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2028-03	[2],[3],[4],[5]
Fair Value	6,868,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,599 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,599,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2043-10	[2],[3],[4],[5]
Fair Value	6,142,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,464 Federal National Mortgage Association Pool, 4.50% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,464,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-02	[2],[3],[4],[5]
Fair Value	6,104,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,138 Government National Mortgage Association Pool, 4.56% 2065-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,138,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.56%	[2],[3],[4],[5]
Maturity	2065-01	[2],[3],[4],[5]
Fair Value	5,895,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,552 Federal National Mortgage Association Pool, 4.50% 2026-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,552,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2026-04	[2],[3],[4],[5]
Fair Value	5,835,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,107 Federal National Mortgage Association Pool, 5.50% 2039-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,107,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	5.50%	[2],[3],[4],[5]
Maturity	2039-10	[2],[3],[4],[5]
Fair Value	5,761,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,455 Federal Home Loan Mortgage Corporation Pool, 3.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,455,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	3.00%	[2],[3],[4],[5]
Maturity	2043-01	[2],[3],[4],[5]
Fair Value	5,596,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,109 Federal National Mortgage Association Pool, 4.00% 2044-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,109,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-06	[2],[3],[4],[5]
Fair Value	5,537,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,953 Federal Home Loan Mortgage Corporation Pool, 4.00% 2044-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,953,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-07	[2],[3],[4],[5]
Fair Value	5,403,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,998 Federal National Mortgage Association Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,998,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2043-08	[2],[3],[4],[5]
Fair Value	5,401,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,898 Federal Home Loan Mortgage Corporation Pool, 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,898,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-10	[2],[3],[4],[5]
Fair Value	5,345,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,691 Federal National Mortgage Association Pool, 4.50% 2044-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,691,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-12	[2],[3],[4],[5]
Fair Value	5,139,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,787 Federal National Mortgage Association Pool, 3.50% 2028-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,787,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2028-12	[2],[3],[4],[5]
Fair Value	5,131,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,771 Federal Home Loan Mortgage Corporation Pool, 4.00% 2045-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,771,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2045-04	[2],[3],[4],[5]
Fair Value	5,107,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,395 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,395,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2043-10	[2],[3],[4],[5]
Fair Value	4,910,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,468 Federal Home Loan Mortgage Corporation Pool, 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,468,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2043-08	[2],[3],[4],[5]
Fair Value	4,837,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,398 Federal Home Loan Mortgage Corporation Pool, 4.00% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,398,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-02	[2],[3],[4],[5]
Fair Value	4,794,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,180 Government National Mortgage Association Pool, 4.68% 2064-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,180,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.68%	[2],[3],[4],[5]
Maturity	2064-09	[2],[3],[4],[5]
Fair Value	4,781,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,426 Federal National Mortgage Association Pool, 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,426,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-10	[2],[3],[4],[5]
Fair Value	4,749,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,230 Federal National Mortgage Association Pool, 4.50% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,230,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-02	[2],[3],[4],[5]
Fair Value	4,680,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,199 Federal National Mortgage Association Pool, 4.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,199,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2043-01	[2],[3],[4],[5]
Fair Value	4,517,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,270 Government National Mortgage Association Pool, 3.50% 2045-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,270,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2045-03	[2],[3],[4],[5]
Fair Value	4,496,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,053 Federal National Mortgage Association Pool, 4.50% 2044-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,053,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-03	[2],[3],[4],[5]
Fair Value	4,491,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,882 Government National Mortgage Association Pool, 4.61% 2064-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,882,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.61%	[2],[3],[4],[5]
Maturity	2064-11	[2],[3],[4],[5]
Fair Value	4,447,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,984 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,984,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	5.00%	[2],[3],[4],[5]
Maturity	2043-10	[2],[3],[4],[5]
Fair Value	4,445,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,149 Federal National Mortgage Association Pool, 3.50% 2029-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,149,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2029-05	[2],[3],[4],[5]
Fair Value	4,432,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,166 Government National Mortgage Association Pool, 4.75% 2061-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,166,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.75%	[2],[3],[4],[5]
Maturity	2061-01	[2],[3],[4],[5]
Fair Value	4,432,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,851 Government National Mortgage Association Pool, 4.63% 2064-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,851,000	[2],[3],[4],[5]
Investment Owned Description	Government National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.63%	[2],[3],[4],[5]
Maturity	2064-10	[2],[3],[4],[5]
Fair Value	4,425,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,121 Federal Home Loan Mortgage Corporation Pool, 3.50% 2043-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,121,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2043-06	[2],[3],[4],[5]
Fair Value	4,342,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,893 Federal National Mortgage Association Pool, 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,893,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2043-10	[2],[3],[4],[5]
Fair Value	4,304,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,793 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,793,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	5.00%	[2],[3],[4],[5]
Maturity	2043-10	[2],[3],[4],[5]
Fair Value	4,270,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,771 Federal National Mortgage Association Pool, 5.00% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,771,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	5.00%	[2],[3],[4],[5]
Maturity	2044-11	[2],[3],[4],[5]
Fair Value	4,206,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,824 Federal National Mortgage Association Pool, 4.50% 2044-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,824,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-03	[2],[3],[4],[5]
Fair Value	4,190,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,797 Federal Home Loan Mortgage Corporation Pool, 4.50% 2043-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,797,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2043-12	[2],[3],[4],[5]
Fair Value	4,151,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,824 Federal National Mortgage Association Pool, 4.00% 2045-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,824,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2045-01	[2],[3],[4],[5]
Fair Value	4,132,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,731 Federal National Mortgage Association Pool, 4.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,731,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-11	[2],[3],[4],[5]
Fair Value	4,099,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,648 Federal National Mortgage Association Pool, 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,648,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	5.00%	[2],[3],[4],[5]
Maturity	2043-10	[2],[3],[4],[5]
Fair Value	4,096,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,775 Federal National Mortgage Association Pool, 4.00% 2033-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,775,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2033-11	[2],[3],[4],[5]
Fair Value	4,095,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,760 Federal Home Loan Mortgage Corporation Pool, 4.00% 2045-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,760,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2045-01	[2],[3],[4],[5]
Fair Value	4,069,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,675 Federal National Mortgage Association Pool, 4.50% 2044-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,675,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.50%	[2],[3],[4],[5]
Maturity	2044-12	[2],[3],[4],[5]
Fair Value	4,050,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,746 Federal National Mortgage Association Pool, 4.00% 2044-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,746,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-06	[2],[3],[4],[5]
Fair Value	4,030,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,691 Federal National Mortgage Association Pool, 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,691,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	4.00%	[2],[3],[4],[5]
Maturity	2044-10	[2],[3],[4],[5]
Fair Value	3,998,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,522 Federal National Mortgage Association Pool, 5.00% 2044-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,522,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	5.00%	[2],[3],[4],[5]
Maturity	2044-01	[2],[3],[4],[5]
Fair Value	3,993,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,893 Federal National Mortgage Association Pool, 3.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,893,000	[2],[3],[4],[5]
Investment Owned Description	Federal National Mortgage Association Pool	[2],[3],[4],[5]
Rate	3.00%	[2],[3],[4],[5]
Maturity	2043-01	[2],[3],[4],[5]
Fair Value	3,990,000	[2],[3],[4],[5]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	364,853,000	[2],[3],[4],[5]	360,009,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal National Mortgage Association Pools	[2],[3],[4],[5]	Other Federal National Mortgage Association Pools	[2],[6],[7],[8]
Fair Value	398,265,000	[2],[3],[4],[5]	389,510,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	3.00%	[2],[3],[4],[5]	3.00%	[2],[6],[7],[8]
Maturity	2026-06	[2],[3],[4],[5]	2026-06	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.00%	[2],[3],[4],[5]	6.00%	[2],[6],[7],[8]
Maturity	2045-04	[2],[3],[4],[5]	2045-01	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	199,022,000	[2],[3],[4],[5]	187,073,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal Home Loan Mortgage Corporation Pools	[2],[3],[4],[5]	Other Federal Home Loan Mortgage Corporation Pools	[2],[6],[7],[8]
Fair Value	215,449,000	[2],[3],[4],[5]	200,541,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	3.00%	[2],[3],[4],[5]	3.00%	[2],[6],[7],[8]
Maturity	2028-03	[2],[3],[4],[5]	2028-03	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.00%	[2],[3],[4],[5]	6.00%	[2],[6],[7],[8]
Maturity	2045-03	[2],[3],[4],[5]	2045-01	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	25,902,000	[2],[3],[4],[5]	26,938,000	[2],[6],[7],[8]
Investment Owned Description	Other Government National Mortgage Association Pools	[2],[3],[4],[5]	Other Government National Mortgage Association Pools	[2],[6],[7],[8]
Fair Value	28,586,000	[2],[3],[4],[5]	29,466,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	4.49%	[2],[3],[4],[5]	4.49%	[2],[6],[7],[8]
Maturity	2060-02	[2],[3],[4],[5]	2060-02	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	5.54%	[2],[3],[4],[5]	5.54%	[2],[6],[7],[8]
Maturity	2065-01	[2],[3],[4],[5]	2064-11	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 25,298 Federal National Mortgage Association Pool 3.50% 2042-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			25,298,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2042-10	[2],[6],[7],[8]
Fair Value			26,448,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 16,987 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			16,987,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-10	[2],[6],[7],[8]
Fair Value			18,242,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 16,831 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			16,831,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-11	[2],[6],[7],[8]
Fair Value			18,129,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 15,372 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			15,372,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-11	[2],[6],[7],[8]
Fair Value			16,540,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 14,026 Federal National Mortgage Association Pool 5.00% 2041-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			14,026,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2041-08	[2],[6],[7],[8]
Fair Value			15,542,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,953 Federal Home Loan Mortgage Corporation Pool 4.50% 2044-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			11,953,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-01	[2],[6],[7],[8]
Fair Value			13,171,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 12,043 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			12,043,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-08	[2],[6],[7],[8]
Fair Value			12,971,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 10,661 Federal National Mortgage Association Pool 5.00% 2041-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			10,661,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2041-03	[2],[6],[7],[8]
Fair Value			11,902,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 11,098 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			11,098,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-09	[2],[6],[7],[8]
Fair Value			11,855,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,186 Federal National Mortgage Association Pool 3.50% 2029-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			9,186,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2029-11	[2],[6],[7],[8]
Fair Value			9,749,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 9,317 Federal Home Loan Mortgage Corporation Pool 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			9,317,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			9,721,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,999 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			8,999,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-07	[2],[6],[7],[8]
Fair Value			9,639,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 8,269 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			8,269,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-08	[2],[6],[7],[8]
Fair Value			8,859,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,982 Federal National Mortgage Association Pool 3.50% 2029-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,982,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2029-12	[2],[6],[7],[8]
Fair Value			8,467,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,951 Federal Home Loan Mortgage Corporation Pool 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,951,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			8,319,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,051 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,051,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-10	[2],[6],[7],[8]
Fair Value			7,572,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 7,232 Federal Home Loan Mortgage Corporation Pool 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,232,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			7,549,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,983 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,983,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			7,514,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,999 Federal Home Loan Mortgage Corporation Pool 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,999,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			7,305,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,933 Federal National Mortgage Association Pool 3.50% 2042-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,933,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2042-11	[2],[6],[7],[8]
Fair Value			7,274,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,436 Federal Home Loan Mortgage Corporation Pool 4.50% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,436,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-02	[2],[6],[7],[8]
Fair Value			7,094,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,564 Federal National Mortgage Association Pool 3.50% 2028-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,564,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2028-03	[2],[6],[7],[8]
Fair Value			6,979,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,148 Federal National Mortgage Association Pool 5.00% 2044-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,148,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2044-03	[2],[6],[7],[8]
Fair Value			6,863,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,945 Government National Mortgage Association Pool 4.59% 2064-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,945,000	[2],[6],[7],[8]
Investment Owned Description			Government National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.59%	[2],[6],[7],[8]
Maturity			2064-11	[2],[6],[7],[8]
Fair Value			6,695,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 6,046 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,046,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-09	[2],[6],[7],[8]
Fair Value			6,459,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,782 Federal National Mortgage Association Pool 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,782,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2043-10	[2],[6],[7],[8]
Fair Value			6,296,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,916 Federal National Mortgage Association Pool 4.50% 2026-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,916,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2026-04	[2],[6],[7],[8]
Fair Value			6,232,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,526 Federal National Mortgage Association Pool 4.50% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,526,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-02	[2],[6],[7],[8]
Fair Value			6,108,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,557 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,557,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			5,973,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,220 Federal National Mortgage Association Pool 5.00% 2044-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,220,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2044-03	[2],[6],[7],[8]
Fair Value			5,839,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,431 Federal National Mortgage Association Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,431,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-08	[2],[6],[7],[8]
Fair Value			5,822,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,410 Federal National Mortgage Association Pool 4.00% 2044-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,410,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-05	[2],[6],[7],[8]
Fair Value			5,819,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,708 Federal Home Loan Mortgage Corporation Pool 3.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,708,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			3.00%	[2],[6],[7],[8]
Maturity			2043-01	[2],[6],[7],[8]
Fair Value			5,788,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,402 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,402,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-08	[2],[6],[7],[8]
Fair Value			5,786,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,131 Federal National Mortgage Association Pool 5.50% 2039-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,131,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.50%	[2],[6],[7],[8]
Maturity			2039-10	[2],[6],[7],[8]
Fair Value			5,741,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,407 Federal National Mortgage Association Pool, 3.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,407,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			5,668,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,130 Federal National Mortgage Association Pool 4.00% 2044-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,130,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-06	[2],[6],[7],[8]
Fair Value			5,502,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,414 Federal National Mortgage Association Pool 3.00% 2043-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,414,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.00%	[2],[6],[7],[8]
Maturity			2043-04	[2],[6],[7],[8]
Fair Value			5,489,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,058 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-07 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,058,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-07	[2],[6],[7],[8]
Fair Value			5,450,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,897 Federal National Mortgage Association Pool 4.50% 2043-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,897,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2043-12	[2],[6],[7],[8]
Fair Value			5,402,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 5,036 Federal National Mortgage Association Pool 3.50% 2029-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,036,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2029-11	[2],[6],[7],[8]
Fair Value			5,353,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,942 Federal National Mortgage Association Pool 4.00% 2044-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,942,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-05	[2],[6],[7],[8]
Fair Value			5,322,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,922 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,922,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-10	[2],[6],[7],[8]
Fair Value			5,304,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,981 Federal National Mortgage Association Pool 3.50% 2028-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,981,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2028-12	[2],[6],[7],[8]
Fair Value			5,290,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,662 Federal National Mortgage Association Pool 4.50% 2044-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,662,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-01	[2],[6],[7],[8]
Fair Value			5,146,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,708 Federal National Mortgage Association Pool 4.50% 2044-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,708,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-12	[2],[6],[7],[8]
Fair Value			5,120,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,585 Federal National Mortgage Association Pool 3.50% 2029-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,585,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2029-12	[2],[6],[7],[8]
Fair Value			4,864,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,413 Federal Home Loan Mortgage Corporation Pool 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,413,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2043-10	[2],[6],[7],[8]
Fair Value			4,861,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,487 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,487,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-02	[2],[6],[7],[8]
Fair Value			4,835,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,491 Federal Home Loan Mortgage Corporation Pool 4.00% 2043-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,491,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-08	[2],[6],[7],[8]
Fair Value			4,810,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,468 Federal National Mortgage Association Pool 4.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,468,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-01	[2],[6],[7],[8]
Fair Value			4,783,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,443 Federal National Mortgage Association Pool 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,443,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-10	[2],[6],[7],[8]
Fair Value			4,750,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,358 Federal Home Loan Mortgage Corporation Pool 4.00% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,358,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			4,689,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,246 Federal National Mortgage Association Pool 4.50% 2044-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,246,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-02	[2],[6],[7],[8]
Fair Value			4,666,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,131 Government National Mortgage Association Pool 4.68% 2064-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,131,000	[2],[6],[7],[8]
Investment Owned Description			Government National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.68%	[2],[6],[7],[8]
Maturity			2064-09	[2],[6],[7],[8]
Fair Value			4,647,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,108 Federal National Mortgage Association Pool 4.50% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,108,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2043-10	[2],[6],[7],[8]
Fair Value			4,499,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,072 Federal National Mortgage Association Pool 4.50% 2044-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,072,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-03	[2],[6],[7],[8]
Fair Value			4,475,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,211 Federal National Mortgage Association Pool 3.50% 2029-05 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,211,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2029-05	[2],[6],[7],[8]
Fair Value			4,467,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,181 Government National Mortgage Association Pool 4.75% 2061-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,181,000	[2],[6],[7],[8]
Investment Owned Description			Government National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.75%	[2],[6],[7],[8]
Maturity			2061-01	[2],[6],[7],[8]
Fair Value			4,457,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,000 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,000,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2043-10	[2],[6],[7],[8]
Fair Value			4,444,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,838 Government National Mortgage Association Pool 4.61% 2064-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,838,000	[2],[6],[7],[8]
Investment Owned Description			Government National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.61%	[2],[6],[7],[8]
Maturity			2064-11	[2],[6],[7],[8]
Fair Value			4,322,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,962 Federal National Mortgage Association Pool 4.50% 2043-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,962,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2043-11	[2],[6],[7],[8]
Fair Value			4,308,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 4,141 Federal Home Loan Mortgage Corporation Pool 3.50% 2043-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,141,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2043-06	[2],[6],[7],[8]
Fair Value			4,298,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,809 Government National Mortgage Association Pool 4.63% 2064-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,809,000	[2],[6],[7],[8]
Investment Owned Description			Government National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.63%	[2],[6],[7],[8]
Maturity			2064-10	[2],[6],[7],[8]
Fair Value			4,295,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,943 Federal Home Loan Mortgage Corporation Pool 4.50% 2043-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,943,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2043-12	[2],[6],[7],[8]
Fair Value			4,294,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,997 Federal National Mortgage Association Pool 4.00% 2044-06 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,997,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-06	[2],[6],[7],[8]
Fair Value			4,289,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,809 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,809,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2043-10	[2],[6],[7],[8]
Fair Value			4,259,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,784 Federal National Mortgage Association Pool 5.00% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,784,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			4,195,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,896 Federal National Mortgage Association Pool 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,896,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-10	[2],[6],[7],[8]
Fair Value			4,193,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,843 Federal National Mortgage Association Pool 4.50% 2044-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,843,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-03	[2],[6],[7],[8]
Fair Value			4,190,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,884 Federal National Mortgage Association Pool 4.00% 2043-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,884,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2043-11	[2],[6],[7],[8]
Fair Value			4,180,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,922 Federal National Mortgage Association Pool 3.50% 2029-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,922,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.50%	[2],[6],[7],[8]
Maturity			2029-11	[2],[6],[7],[8]
Fair Value			4,170,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,807 Federal National Mortgage Corporation Pool 4.00% 2033-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,807,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2033-11	[2],[6],[7],[8]
Fair Value			4,123,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,656 Federal National Mortgage Association Pool 5.00% 2044-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,656,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2044-01	[2],[6],[7],[8]
Fair Value			4,121,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,816 Federal National Mortgage Association Pool 4.00% 2042-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,816,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2042-04	[2],[6],[7],[8]
Fair Value			4,098,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,683 Federal National Mortgage Association Pool 5.00% 2043-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,683,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2043-11	[2],[6],[7],[8]
Fair Value			4,086,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,661 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,661,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2043-10	[2],[6],[7],[8]
Fair Value			4,085,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,744 Federal National Mortgage Association Pool 4.50% 2044-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,744,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-11	[2],[6],[7],[8]
Fair Value			4,079,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,692 Federal National Mortgage Association Pool 4.50% 2044-12 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,692,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.50%	[2],[6],[7],[8]
Maturity			2044-12	[2],[6],[7],[8]
Fair Value			4,045,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,706 Federal National Mortgage Association Pool 4.00% 2044-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,706,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			4.00%	[2],[6],[7],[8]
Maturity			2044-10	[2],[6],[7],[8]
Fair Value			3,989,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,921 Federal National Mortgage Association Pool 3.00% 2043-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,921,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			3.00%	[2],[6],[7],[8]
Maturity			2043-01	[2],[6],[7],[8]
Fair Value			3,978,000	[2],[6],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | 3,597 Federal National Mortgage Association Pool 5.00% 2043-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,597,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association Pool	[2],[6],[7],[8]
Rate			5.00%	[2],[6],[7],[8]
Maturity			2043-10	[2],[6],[7],[8]
Fair Value			3,973,000	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	0.90%	[1],[2],[3],[4],[5]	1.20%	[1],[2],[6],[7],[8]
Fair Value	7,071,000	[2],[3],[4],[5]	9,441,000	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	43,333,000	[2],[3],[4],[5]	56,737,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal National Mortgage Association	[2],[3],[4],[5]	Other Federal National Mortgage Association	[2],[6],[7],[8]
Fair Value	4,880,000	[2],[3],[4],[5]	6,971,000	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	3.00%	[2],[3],[4],[5]	3.00%	[2],[6],[7],[8]
Maturity	2020-12	[2],[3],[4],[5]	2020-12	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	5.50%	[2],[3],[4],[5]	5.50%	[2],[6],[7],[8]
Maturity	2043-05	[2],[3],[4],[5]	2043-06	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	15,146,000	[2],[3],[4],[5]	16,165,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal Home Loan Mortgage Corporation	[2],[3],[4],[5]	Other Federal Home Loan Mortgage Corporation	[2],[6],[7],[8]
Fair Value	1,794,000	[2],[3],[4],[5]	2,009,000	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	3.50%	[2],[3],[4],[5]	3.50%	[2],[6],[7],[8]
Maturity	2032-12	[2],[3],[4],[5]	2032-12	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	5.50%	[2],[3],[4],[5]	5.50%	[2],[6],[7],[8]
Maturity	2040-03	[2],[3],[4],[5]	2040-03	[2],[6],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Other Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	2,142,000	[2],[3],[4],[5]	2,142,000	[2],[6],[7],[8]
Investment Owned Description	Other Government National Mortgage Association	[2],[3],[4],[5]	Other Government National Mortgage Association	[2],[6],[7],[8]
Rate	4.75%	[2],[3],[4],[5]	4.75%	[2],[6],[7],[8]
Maturity	2040-07	[2],[3],[4],[5]	2040-07	[2],[6],[7],[8]
Fair Value	397,000	[2],[3],[4],[5]	461,000	[2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	3.51%	[1],[2],[3],[4],[5]	9.18%	[1],[2],[6],[7],[8]
Current Principal/Notional Amount	26,990,000		71,598,000
Fair Value	27,590,000	[2],[3],[4],[5]	72,410,000	[2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (30 Year) [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			44,478,000	[2],[6],[7],[8]
Investment Owned Description			Federal National Mortgage Association (30 Year)	[2],[6],[7],[8]
Rate			3.00%	[2],[6],[7],[8]
Maturity			2015-01	[2],[6],[7],[8]
Fair Value			45,015,000	[2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			27,120,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation (30 Year)	[2],[6],[7],[8]
Rate			3.00%	[2],[6],[7],[8]
Maturity			2015-01	[2],[6],[7],[8]
Fair Value			27,395,000	[2],[6],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.00%[Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	25,090,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation (30 Year)	[2],[3],[4],[5]
Rate	3.00%	[2],[3],[4],[5]
Maturity	2015-04	[2],[3],[4],[5]
Fair Value	25,598,000	[2],[3],[4],[5]
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.50% [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	1,900,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation (30 Year)	[2],[3],[4],[5]
Rate	3.50%	[2],[3],[4],[5]
Maturity	2015-04	[2],[3],[4],[5]
Fair Value	1,992,000	[2],[3],[4],[5]
Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	143.74%	[1],[2],[3],[4],[5]	158.20%	[1],[2],[6],[7],[8]
Fair Value	1,128,945,000	[2],[3],[4],[5]	1,247,493,000	[2],[6],[7],[8]
Investment Owned, at Cost	1,107,405,000	[2],[3],[4],[5]	1,230,414,000	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	2.58%	[1],[2],[3],[4],[5]	2.62%	[1],[2],[6],[7],[8]
Fair Value	20,233,000	[2],[3],[4],[5]	20,647,000	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,255,000	[2],[3],[4],[5]	6,265,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal National Mortgage Association Pools	[2],[3],[4],[5]	Other Federal National Mortgage Association Pools	[2],[6],[7],[8]
Fair Value	6,679,000	[2],[3],[4],[5]	6,692,000	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	5.05%	[2],[3],[4],[5]	5.04%	[2],[6],[7],[8]
Maturity	2035-09	[2],[3],[4],[5]	2035-09	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association Pools [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.05%	[2],[3],[4],[5]	6.05%	[2],[6],[7],[8]
Maturity	2037-09	[2],[3],[4],[5]	2037-09	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	4,636,000	[2],[3],[4],[5]	4,653,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal Home Loan Mortgage Corporation Pools	[2],[3],[4],[5]	Other Federal Home Loan Mortgage Corporation Pools	[2],[6],[7],[8]
Fair Value	4,895,000	[2],[3],[4],[5]	4,876,000	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	2.36%	[2],[3],[4],[5]	2.36%	[2],[6],[7],[8]
Maturity	2037-06	[2],[3],[4],[5]	2037-06	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation Pools [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	5.94%	[2],[3],[4],[5]	5.94%	[2],[6],[7],[8]
Maturity	2044-05	[2],[3],[4],[5]	2044-05	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association Pools [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	2,994,000	[2],[3],[4],[5]	3,404,000	[2],[6],[7],[8]
Investment Owned Description	Other Government National Mortgage Association Pool	[2],[3],[4],[5]	Other Government National Mortgage Association Pool	[2],[6],[7],[8]
Rate	2.50%	[2],[3],[4],[5]	2.47%	[2],[6],[7],[8]
Maturity	2064-11	[2],[3],[4],[5]	2064-11	[2],[6],[7],[8]
Fair Value	3,238,000	[2],[3],[4],[5]	3,673,000	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | 5,084 Federal Home Loan Mortgage Corporation Pool 4.92% 2038-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			5,084,000	[2],[6],[7],[8]
Investment Owned Description			Federal Home Loan Mortgage Corporation Pool	[2],[6],[7],[8]
Rate			4.92%	[2],[6],[7],[8]
Maturity			2038-04	[2],[6],[7],[8]
Fair Value			5,406,000	[2],[6],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | 5,083 Federal Home Loan Mortgage Corporation Pool, 4.92% 2038-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,083,000	[2],[3],[4],[5]
Investment Owned Description	Federal Home Loan Mortgage Corporation Pool	[2],[3],[4],[5]
Rate	4.92%	[2],[3],[4],[5]
Maturity	2038-04	[2],[3],[4],[5]
Fair Value	5,421,000	[2],[3],[4],[5]
Interest Only - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	2.45%	[1],[2],[3],[4],[5]	2.78%	[1],[2],[6],[7],[8]
Fair Value	19,264,000	[2],[3],[4],[5]	21,944,000	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	20,410,000	[2],[3],[4],[5]	28,251,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal National Mortgage Association	[2],[3],[4],[5]	Other Federal National Mortgage Association	[2],[6],[7],[8]
Fair Value	3,041,000	[2],[3],[4],[5]	4,508,000	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	5.50%	[2],[3],[4],[5]	5.50%	[2],[6],[7],[8]
Maturity	2035-04	[2],[3],[4],[5]	2035-04	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal National Mortgage Association [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.53%	[2],[3],[4],[5]	6.58%	[2],[6],[7],[8]
Maturity	2041-12	[2],[3],[4],[5]	2043-07	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	7,874,000	[2],[3],[4],[5]	13,048,000	[2],[6],[7],[8]
Investment Owned Description	Other Federal Home Loan Mortgage Corporation	[2],[3],[4],[5]	Other Federal Home Loan Mortgage Corporation	[2],[6],[7],[8]
Fair Value	1,345,000	[2],[3],[4],[5]	1,872,000	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	5.83%	[2],[3],[4],[5]	5.84%	[2],[6],[7],[8]
Maturity	2036-03	[2],[3],[4],[5]	2036-03	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Federal Home Loan Mortgage Corporation [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.46%	[2],[3],[4],[5]	6.47%	[2],[6],[7],[8]
Maturity	2039-08	[2],[3],[4],[5]	2039-08	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	180,262,000	[2],[3],[4],[5]	183,794,000	[2],[6],[7],[8]
Investment Owned Description	Other Government National Mortgage Association	[2],[3],[4],[5]	Other Government National Mortgage Association	[2],[6],[7],[8]
Fair Value	12,921,000	[2],[3],[4],[5]	13,591,000	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.41%	[2],[3],[4],[5]	0.40%	[2],[6],[7],[8]
Maturity	2042-11	[2],[3],[4],[5]	2042-11	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Other Government National Mortgage Association [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	6.57%	[2],[3],[4],[5]	6.58%	[2],[6],[7],[8]
Maturity	2063-10	[2],[3],[4],[5]	2063-10	[2],[6],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Resecuritization of Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	20,953,000	[2],[3],[4],[5],[9]	21,145,000	[2],[6],[7],[8],[9]
Investment Owned Description	Resecuritization of Government National Mortgage Association (aa)	[2],[3],[4],[5],[9]	Resecuritization of Government National Mortgage Association (w)	[2],[6],[7],[8],[9]
Rate	4.33%	[2],[3],[4],[5],[9]	4.34%	[2],[6],[7],[8],[9]
Maturity	2060-08	[2],[3],[4],[5],[9]	2060-08	[2],[6],[7],[8],[9]
Fair Value	1,957,000	[2],[3],[4],[5],[9]	1,973,000	[2],[6],[7],[8],[9]
Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	5.03%	[1],[2],[3],[4],[5]	5.40%	[1],[2],[6],[7],[8]
Fair Value	39,497,000	[2],[3],[4],[5]	42,591,000	[2],[6],[7],[8]
Investment Owned, at Cost	38,341,000	[2],[3],[4],[5]	41,787,000	[2],[6],[7],[8]
Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	148.77%	[1],[2],[3],[4],[5]	163.60%	[1],[2],[6],[7],[8]
Fair Value	1,168,442,000	[2],[3],[4],[5]	1,290,084,000	[2],[6],[7],[8]
Investment Owned, at Cost	1,145,746,000	[2],[3],[4],[5]	1,272,201,000	[2],[6],[7],[8]
Principal And Interest - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	63.99%	[1],[2],[3],[4]	76.95%	[1],[2],[6],[7]
Fair Value	502,585,000	[2],[3],[4]	606,757,000	[2],[6],[7]
Investment Owned, at Cost	473,337,000	[2],[3],[4]	571,834,000	[2],[6],[7]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	832,108,000	[2],[3],[4]	963,038,000	[2],[6],[7]
Investment Owned Description	Various	[2],[3],[4]	Various	[2],[6],[7]
Fair Value	502,585,000	[2],[3],[4]	606,757,000	[2],[6],[7]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.00%	[2],[3],[4]	0.00%	[2],[6],[7]
Maturity	2015-07	[2],[3],[4]	2015-07	[2],[6],[7]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	9.35%	[2],[3],[4]	12.25%	[2],[6],[7]
Maturity	2049-12	[2],[3],[4]	2061-01	[2],[6],[7]
Principal Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	0.46%	[1],[2],[3],[4]	0.41%	[1],[2],[6],[7]
Fair Value	3,627,000	[2],[3],[4]	3,248,000	[2],[6],[7]
Investment Owned, at Cost	2,805,000	[2],[3],[4]	2,737,000	[2],[6],[7]
Principal Only - Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,800,000	[2],[3],[4]	5,800,000	[2],[6],[7]
Investment Owned Description	Various	[2],[3],[4]	Various	[2],[6],[7]
Rate	0.00%	[2],[3],[4]	0.00%	[2],[6],[7]
Maturity	2030-08	[2],[3],[4]	2030-08	[2],[6],[7]
Fair Value	3,627,000	[2],[3],[4]	3,248,000	[2],[6],[7]
Interest Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	0.38%	[1],[2],[3],[4]	0.31%	[1],[2],[6],[7]
Fair Value	3,017,000	[2],[3],[4]	2,423,000	[2],[6],[7]
Investment Owned, at Cost	2,224,000	[2],[3],[4]	1,602,000	[2],[6],[7]
Interest Only - Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	72,749,000	[2],[3],[4]	65,223,000	[2],[6],[7]
Investment Owned Description	Various	[2],[3],[4]	Various	[2],[6],[7]
Fair Value	3,017,000	[2],[3],[4]	2,423,000	[2],[6],[7]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.50%	[2],[3],[4]	0.50%	[2],[6],[7]
Maturity	2044-06	[2],[3],[4]	2044-06	[2],[6],[7]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	2.00%	[2],[3],[4]	2.00%	[2],[6],[7]
Maturity	2048-02	[2],[3],[4]	2047-12	[2],[6],[7]
Other Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	0.00%	[1],[2],[3],[4]	0.00%	[1],[2],[6],[7]
Fair Value	0	[2],[3],[4]	0	[2],[6],[7]
Investment Owned, at Cost	300,000	[2],[3],[4]	302,000	[2],[6],[7]
Other Private Label Securities [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	110,755,000	[2],[3],[4]	111,629,000	[2],[6],[7]
Investment Owned Description	Various	[2],[3],[4]	Various	[2],[6],[7]
Rate	0.00%	[2],[3],[4]	0.00%	[2],[6],[7]
Fair Value	0	[2],[3],[4]	0	[2],[6],[7]
Other Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Maturity	2037-06	[2],[3],[4]	2037-06	[2],[6],[7]
Other Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Maturity	2048-02	[2],[3],[4]	2047-10	[2],[6],[7]
Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	64.83%	[1],[2],[3],[4]	77.67%	[1],[2],[6],[7]
Fair Value	509,229,000	[2],[3],[4]	612,428,000	[2],[6],[7]
Investment Owned, at Cost	478,666,000	[2],[3],[4]	576,475,000	[2],[6],[7]
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	213.60%	[1],[2],[3],[4]	241.27%	[1],[2],[6],[7]
Fair Value	1,677,671,000	[2],[3],[4]	1,902,512,000	[2],[6],[7]
Investment Owned, at Cost	1,624,412,000	[2],[3],[4]	1,848,676,000	[2],[6],[7]
Other asset-backed securities and loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	15.74%	[1],[2],[3],[4]	18.55%	[1],[2],[6],[7]
Fair Value	123,620,000	[2],[3],[4]	146,288,000	[2],[6],[7]
Investment Owned, at Cost	127,873,000	[2],[3],[4]	149,386,000	[2],[6],[7]
Other asset-backed securities and loans [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	144,672,000	[2],[3],[4]	169,458,000	[2],[6],[7]
Investment Owned Description	Various	[2],[3],[4]	Various	[2],[6],[7]
Fair Value	123,620,000	[2],[3],[4]	146,288,000	[2],[6],[7]
Other asset-backed securities and loans [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	0.00%	[2],[3],[4]	0.00%	[2],[6],[7]
Maturity	2015-10	[2],[3],[4]	2015-06	[2],[6],[7]
Other asset-backed securities and loans [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	43.00%	[2],[3],[4]	49.00%	[2],[6],[7]
Maturity	2068-09	[2],[3],[4]	2068-09	[2],[6],[7]
Corporate Debt [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	4.05%	[1],[2],[3],[4]	5.41%	[1],[2],[6],[7]
Fair Value	31,836,000	[2],[3],[4]	42,708,000	[2],[6],[7]
Investment Owned, at Cost	33,293,000	[2],[3],[4]	43,585,000	[2],[6],[7]
Corporate Debt [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	34,484,000	[2],[3],[4]	46,006,000	[2],[6],[7]
Investment Owned Description	Various	[2],[3],[4]	Various	[2],[6],[7]
Fair Value	31,836,000	[2],[3],[4]	42,708,000	[2],[6],[7]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	5.50%	[2],[3],[4]	5.25%	[2],[6],[7]
Maturity	2017-01	[2],[3],[4]	2016-06	[2],[6],[7]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	15.00%	[2],[3],[4]	15.00%	[2],[6],[7]
Maturity	2021-09	[2],[3],[4]	2021-09	[2],[6],[7]
Commercial Mortgage Loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	4.96%	[1],[10],[2],[3],[4]	3.59%	[1],[11],[2],[6],[7]
Fair Value	38,918,000	[10],[2],[3],[4]	28,309,000	[11],[2],[6],[7]
Investment Owned, at Cost	38,858,000	[10],[2],[3],[4]	28,266,000	[11],[2],[6],[7]
Commercial Mortgage Loans [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	55,019,000	[10],[2],[3],[4]	32,519,000	[11],[2],[6],[7]
Investment Owned Description	Various	[10],[2],[3],[4]	Various	[11],[2],[6],[7]
Fair Value	38,918,000	[10],[2],[3],[4]	28,309,000	[11],[2],[6],[7]
Commercial Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Rate	3.00%	[10],[2],[3],[4]	0.00%	[11],[2],[6],[7]
Maturity	2015-08	[10],[2],[3],[4]	2015-01	[11],[2],[6],[7]
Commercial Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Rate	10.00%	[10],[2],[3],[4]	10.00%	[11],[2],[6],[7]
Maturity	2045-04	[10],[2],[3],[4]	2017-11	[11],[2],[6],[7]
Residential Mortgage Loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	3.93%	[1],[2],[3],[4]	3.49%	[1],[2],[6],[7]
Fair Value	30,845,000	[2],[3],[4]	27,482,000	[2],[6],[7]
Investment Owned, at Cost	30,618,000	[2],[3],[4]	27,398,000	[2],[6],[7]
Residential Mortgage Loans [Member] | Various Issuer [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	46,673,000	[2],[3],[4]	44,336,000	[2],[6],[7]
Investment Owned Description	Various	[2],[3],[4]	Various	[2],[6],[7]
Rate	0.00%	[2],[3],[4]	0.00%	[2],[6],[7]
Fair Value	30,845,000	[2],[3],[4]	27,482,000	[2],[6],[7]
Residential Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member]
Schedule of Investments [Line Items]
Maturity	2018-02	[2],[3],[4]	2018-02	[2],[6],[7]
Residential Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member]
Schedule of Investments [Line Items]
Maturity	2055-04	[2],[3],[4]	2054-10	[2],[6],[7]
Real Estate Owned [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	1.15%	[1],[12],[2],[3],[4]	1.10%	[1],[12],[2],[6],[7]
Fair Value	9,070,000	[12],[2],[3],[4]	8,635,000	[12],[2],[6],[7]
Investment Owned, at Cost	8,646,000	[12],[2],[3],[4]	8,748,000	[12],[2],[6],[7]
Real Estate Owned [Member] | Single-Family Houses [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	48	[12],[2],[3],[4]	50	[12],[2],[6],[7]
Investment Owned Description	Single-Family Houses	[12],[2],[3],[4]	Single-Family Houses	[12],[2],[6],[7]
Fair Value	7,026,000	[12],[2],[3],[4]	6,591,000	[12],[2],[6],[7]
Real Estate Owned [Member] | Commercial Property [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	1	[12],[2],[3],[4]	1	[12],[2],[6],[7]
Investment Owned Description	Commercial Property	[12],[2],[3],[4]	Commercial Property	[12],[2],[6],[7]
Fair Value	2,044,000	[12],[2],[3],[4]	2,044,000	[12],[2],[6],[7]
Private Corporate Equity Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	2.71%	[1],[2],[3],[4]	1.84%	[1],[2],[6],[7]
Fair Value	21,300,000	[2],[3],[4]	14,512,000	[2],[6],[7]
Investment Owned, at Cost	21,274,000	[2],[3],[4]	14,717,000	[2],[6],[7]
Private Corporate Equity Investments [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	2.71%		1.84%
Fair Value	21,300,000		14,512,000
Investment Owned, at Cost	21,274,000		14,717,000
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership
Schedule of Investments [Line Items]
Investment Owned Description	Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-Related Private Partnership	[2],[3],[4]	Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-Related Private Partnership	[2],[6],[7]
Fair Value	8,171,000	[2],[3],[4]	6,241,000	[2],[6],[7]
Investment Owned, Balance, Shares	8,171	[2],[3],[4]	6,241	[2],[6],[7]
Private Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member]
Schedule of Investments [Line Items]
Investment Owned Description	Non-Exchange Traded Corporate Equity	[2],[3],[4]	Non-Exchange Traded Corporate Equity	[2],[6],[7]
Fair Value	5,138,000	[2],[3],[4]	2,860,000	[2],[6],[7]
Investment Owned, Balance, Shares	208	[2],[3],[4]	88	[2],[6],[7]
Private Corporate Equity Investments [Member] | Non-controlling Interest in Mortgage-related Private Partnership [Member]
Schedule of Investments [Line Items]
Investment Owned Description	Non-Controlling Interest in Mortgage-Related Private Partnership	[2],[3],[4]	Non-Controlling Interest in Mortgage-Related Private Partnership	[2],[6],[7]
Fair Value	2,753,000	[2],[3],[4]	2,673,000	[2],[6],[7]
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage Originators [Member]
Schedule of Investments [Line Items]
Investment Owned Description	Non-Exchange Traded Preferred Equity Investment in Mortgage Originators	[2],[3],[4]	Non-Exchange Traded Preferred Equity Investment in Mortgage Originators	[2],[6],[7]
Fair Value	4,325,000	[2],[3],[4]	2,500,000	[2],[6],[7]
Investment Owned, Balance, Shares	9,482	[2],[3],[4]	7,657	[2],[6],[7]
Private Corporate Equity Investments [Member] | Non-Exchange Traded Equity Investment in Mortgage Originator
Schedule of Investments [Line Items]
Investment Owned Description	Non-Exchange Traded Equity Investment in Mortgage Originators	[2],[3],[4]	Non-Exchange Traded Equity Investment in Mortgage Originators	[2],[6],[7]
Fair Value	913,000	[2],[3],[4]	238,000	[2],[6],[7]
Investment Owned, Balance, Shares	7,478	[2],[3],[4]	728	[2],[6],[7]
U.S. Treasury Note 1.00% [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	10,660,000	[2],[3],[4]
Investment Owned Description	U.S. Treasury Note	[2],[3],[4]
Rate	1.00%	[2],[3],[4]
Maturity	2018-03	[2],[3],[4]
Fair Value	10,697,000	[2],[3],[4]
U.S. Treasury Note 1.38% [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	6,556,000	[2],[3],[4]
Investment Owned Description	U.S. Treasury Note	[2],[3],[4]
Rate	1.38%	[2],[3],[4]
Maturity	2020-03	[2],[3],[4]
Fair Value	6,557,000	[2],[3],[4]
U.S. Treasury Note 0.50% [Member] | US Treasury Securities [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	429,000	[2],[3],[4]
Investment Owned Description	U.S. Treasury Note	[2],[3],[4]
Rate	0.50%	[2],[3],[4]
Maturity	2017-02	[2],[3],[4]
Fair Value	429,000	[2],[3],[4]
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	2.25%	[1],[2],[3],[4]	0.21%	[1],[2],[6],[7]
Fair Value	17,683,000	[2],[3],[4]	1,636,000	[2],[6],[7]
Investment Owned, at Cost	17,677,000	[2],[3],[4]	1,550,000	[2],[6],[7]
US Treasury Securities [Member] | US Treasury Bond Securities [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			1,560,000	[2],[6],[7]
Investment Owned Description			U.S. Treasury Bond	[2],[6],[7]
Rate			3.00%	[2],[6],[7]
Maturity			2044-11	[2],[6],[7]
Fair Value			1,636,000	[2],[6],[7]
Long Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	248.39%	[1],[2],[3],[4]	275.46%	[1],[2],[6],[7]
Fair Value	1,950,943,000	[2],[3],[4]	2,172,082,000	[2],[6],[7]
Investment Owned, at Cost	1,902,651,000	[2],[3],[4]	2,122,326,000	[2],[6],[7]
Long Investments [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	239.53%		264.46%
Current Principal/Notional Amount	2,606,164,000		2,863,057,000
Fair Value	1,881,365,000		2,092,959,000
Investment Owned, at Cost	1,823,880,000		2,038,249,000
Long Investments [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	6.15%		9.16%
Current Principal/Notional Amount	56,061,000		69,724,000
Fair Value	48,278,000		64,611,000
Investment Owned, at Cost	$57,497,000		$69,360,000
Long Investments [Member] | Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	83.65%		100.30%
Long Investments [Member] | Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	53.13%		53.97%
Long Investments [Member] | Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	11.99%		9.33%
[1]	Classification percentages are based on Total Equity.
[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 ofEquityUnrated but Agency-Guaranteed 148.77%A/A/A 0.34%Baa/BBB/BBB 3.04%Ba/BB/BB or below 64.24%Unrated 32.00%
[4]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,606,164 $1,823,880 $1,881,365 239.53 %Europe 56,061 57,497 48,278 6.15 %North America (Private Corporate Equity Investments) n/a 21,274 21,300 2.71 %Total $1,902,651 $1,950,943 248.39 %Investments Sold Short: North America (TBAs and Government Debt) (1,103,716) $(1,170,994) $(1,175,699) (149.69)%Europe (Government Debt) (19,039) (22,575) (20,183) (2.57)%Total $(1,122,755) $(1,193,569) $(1,195,882) (152.26)%Repurchase Agreements: North America 24,046 $24,046 $24,046 3.06 %Europe 20,709 21,027 20,708 2.64 %Total 44,755 $45,073 $44,754 5.70 %Financial Derivatives–Assets: North America 1,650,257 $45,179 $58,131 7.40 %Europe 159,342 33,420 31,713 4.04 %Total 1,809,599 $78,599 $89,844 11.44 %Financial Derivatives–Liabilities: North America (2,731,689) $(26,330) $(55,961) (7.13)%Europe (115,111) (10,854) (11,706) (1.49)%Total (2,846,800) $(37,184) $(67,667) (8.62)%
[5]	At March 31, 2015, 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 83.65%, 53.13%, and 11.99% of equity, respectively.
[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 163.60%A/A/A 0.98%Baa/BBB/BBB 5.62%Ba/BB/BB or below 80.65%Unrated 24.61%
[7]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Properties/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,863,057 $2,038,249 $2,092,959 264.46 %Europe 69,724 69,360 64,611 9.16 %North America (Private Corporate Equity Investments) n/a 14,717 14,512 1.84 %Total $2,122,326 $2,172,082 275.46 %Investments Sold Short: North America (TBAs and Government Debt) (1,159,703) $(1,230,478) $(1,234,248) (156.53)%Europe (Government Debt) (28,118) (32,008) (30,606) (3.88)%North America (Common Stock) (2,986) (27,605) (26,516) (3.36)%Total $(1,290,091) $(1,291,370) (163.77)%Repurchase Agreements: North America 140,248 $140,248 $140,248 17.78 %Europe 31,753 31,753 31,753 4.03 %Total 172,001 $172,001 $172,001 21.81 %Financial Derivatives–Assets: North America 1,401,261 $61,560 $80,029 10.15 %Europe — — — — %Total 1,401,261 $61,560 $80,029 10.15 %Financial Derivatives–Liabilities: North America (936,799) $(30,598) $(63,084) (8.00)%Europe (37,199) (2,957) (3,032) (0.39)%Total (973,998) $(33,555) $(66,116) (8.39)%
[8]	At December 31, 2014, 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 100.30%, 53.97%, and 9.33% of equity, respectively.
[9]	Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.
[10]	Includes non-performing commercial loans in the amount of $15.0 million whereby principal and/or interest is past due and a maturity date is not applicable.
[11]	Includes non-performing commercial loans in the amount of $11.3 million whereby principal and/or interest is past due and a maturity date is not applicable.
[12]	Number of properties not shown in thousands, represents actual number of properties owned.

Consolidated_Condensed_Schedul1

Consolidated Condensed Schedule Of Investments (Repurchase Agreements) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Schedule of Investments [Line Items]
Fair value repurchase agreements	$44,754,000	[1]	$172,001,000	[1]
Repurchase agreements, cost	45,073,000		172,001,000
Repurchase Agreements [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	44,755,000		172,001,000
Fair value repurchase agreements	44,754,000	[2],[3],[4]	172,001,000	[2],[3],[5]
Investment owned as a percentage of equity	5.70%	[2],[3],[4],[6]	21.81%	[2],[3],[5],[6]
Repurchase agreements, cost	45,073,000	[2],[3],[4]	172,001,000	[2],[3],[5]
Repurchase Agreements [Member] | Deutsche Bank Securities Collateralized by Par Value $9,054 Sovereign Government Bond Coupon 2.75% Maturity Date 2019-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	10,325,000	[2],[3],[4]
Securities collateralized by par value	9,054,000	[2],[3],[4]
Coupon rate on underlying collateral	2.75%	[2],[3],[4]
Maturity date of securities	2019-04	[2],[3],[4]
Description	Deutsche Bank Securities Collateralized by Par Value $9,054 Sovereign Government Bond, Coupon 2.75%, Maturity Date 4/19	[2],[3],[4]
Rate	-0.22%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	10,324,000	[2],[3],[4]
Repurchase Agreements [Member] | Deutsche Bank Securities Collateralized By Par Value $8,055 Sovereign Government Bond Coupon 0.50% Maturity Date 2019-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	8,338,000	[2],[3],[4]
Securities collateralized by par value	8,055,000	[2],[3],[4]
Coupon rate on underlying collateral	0.50%	[2],[3],[4]
Maturity date of securities	2019-11	[2],[3],[4]
Description	Deutsche Bank Securities Collateralized by Par Value $8,055 Sovereign Government Bond, Coupon 0.50%, Maturity Date 11/19	[2],[3],[4]
Rate	-0.30%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	8,338,000	[2],[3],[4]
Repurchase Agreements [Member] | Bank of America Collateralized By Par Value $7,400 U.S. Treasury Note Coupon 2.00% Maturity Date 2025-02 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	7,446,000	[2],[3],[4]
Securities collateralized by par value	7,400,000	[2],[3],[4]
Coupon rate on underlying collateral	2.00%	[2],[3],[4]
Maturity date of securities	2025-02	[2],[3],[4]
Description	Bank of America Collateralized by Par Value $7,400 U.S. Treasury Note, Coupon 2.00%, Maturity Date 2/25	[2],[3],[4]
Rate	-1.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	7,446,000	[2],[3],[4]
Repurchase Agreements [Member] | Bank of America Collateralized By Par Value $5,000 U.S. Treasury Note Coupon 1.25% Maturity Date 2018-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	5,050,000	[2],[3],[4]
Securities collateralized by par value	5,000,000	[2],[3],[4]
Coupon rate on underlying collateral	1.25%	[2],[3],[4]
Maturity date of securities	2018-10	[2],[3],[4]
Description	Bank of America Collateralized by Par Value $5,000 U.S. Treasury Note, Coupon 1.25%, Maturity Date 10/18	[2],[3],[4]
Rate	0.24%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	5,050,000	[2],[3],[4]
Repurchase Agreements [Member] | Bank of America Collateralized By Par Value $4,000 U.S. Treasury Note Coupon 1.38% Maturity Date 2020-03 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,995,000	[2],[3],[4]
Securities collateralized by par value	4,000,000	[2],[3],[4]
Coupon rate on underlying collateral	1.38%	[2],[3],[4]
Maturity date of securities	2020-03	[2],[3],[4]
Description	Bank of America Collateralized by Par Value $4,000 U.S. Treasury Note, Coupon 1.38%, Maturity Date 3/20	[2],[3],[4]
Rate	0.25%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	3,995,000	[2],[3],[4]
Repurchase Agreements [Member] | Bank of America Collateralized By Par Value $3,200 U.S. Treasury Note Coupon 2.25% Maturity Date 2024-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	3,312,000	[2],[3],[4]
Securities collateralized by par value	3,200,000	[2],[3],[4]
Coupon rate on underlying collateral	2.25%	[2],[3],[4]
Maturity date of securities	2024-11	[2],[3],[4]
Description	Bank of America Collateralized by Par Value $3,200 U.S. Treasury Note, Coupon 2.25%, Maturity Date 11/24	[2],[3],[4]
Rate	0.25%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	3,312,000	[2],[3],[4]
Repurchase Agreements [Member] | Bank of America Collateralized By Par Value $2,000 U.S. Treasury Bond Coupon 3.13% Maturity Date 2044-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	2,253,000	[2],[3],[4]
Securities collateralized by par value	2,000,000	[2],[3],[4]
Coupon rate on underlying collateral	3.13%	[2],[3],[4]
Maturity date of securities	2044-08	[2],[3],[4]
Description	Bank of America Collateralized by Par Value $2,000 U.S. Treasury Bond, Coupon 3.13%, Maturity Date 8/44	[2],[3],[4]
Rate	0.15%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	2,253,000	[2],[3],[4]
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $1,929 Sovereign Government Bond Coupon 4.00% Maturity Date 2016-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	2,046,000	[2],[3],[4]
Securities collateralized by par value	1,929,000	[2],[3],[4]
Coupon rate on underlying collateral	4.00%	[2],[3],[4]
Maturity date of securities	2016-09	[2],[3],[4]
Description	Barclays Capital Inc. Collateralized by Par Value $1,929 Sovereign Government Bond, Coupon 4.00%, Maturity Date 9-16	[2],[3],[4]
Rate	0.35%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	2,046,000	[2],[3],[4]
Repurchase Agreements [Member] | Bank of America Collateralized by Par Value $2,000 U.S. Treasury Bond Coupon 1.25% Maturity Date 2020-01 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	1,990,000	[2],[3],[4]
Securities collateralized by par value	2,000,000	[2],[3],[4]
Coupon rate on underlying collateral	1.25%	[2],[3],[4]
Maturity date of securities	2020-01	[2],[3],[4]
Description	Bank of America Collateralized by Par Value $2,000 U.S. Treasury Bond, Coupon 1.25%, Maturity Date 1/20	[2],[3],[4]
Rate	0.05%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Fair value repurchase agreements	1,990,000	[2],[3],[4]
Repurchase Agreements [Member] | Deutsche Bank Securities Collateralized By Par Value $122,870 U.S. Treasury Note, Coupon 1.50% Maturity Date 2019-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			122,256,000	[2],[3],[5]
Securities collateralized by par value			122,870,000	[2],[3],[5]
Coupon rate on underlying collateral			1.50%	[2],[3],[5]
Maturity date of securities			2019-11	[2],[3],[5]
Description			Deutsche Bank Securities Collateralized by Par Value $122,870 U.S. Treasury Note, Coupon 1.50%, Maturity Date 11/19	[2],[3],[5]
Rate			-0.22%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			122,256,000	[2],[3],[5]
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $11,508 Sovereign Government Bond, Coupon 2.75% Maturity Date 2019-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			13,090,000	[2],[3],[5]
Securities collateralized by par value			11,508,000	[2],[3],[5]
Coupon rate on underlying collateral			2.75%	[2],[3],[5]
Maturity date of securities			2019-04	[2],[3],[5]
Description			Barclays Capital Inc. Collateralized by Par Value $11,508 Sovereign Government Bond, Coupon 2.75%, Maturity Date 4/19	[2],[3],[5]
Rate			-0.10%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			13,090,000	[2],[3],[5]
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $8,390 Sovereign Government Bond, Coupon 3.75% Maturity Date 2018-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			9,712,000	[2],[3],[5]
Securities collateralized by par value			8,390,000	[2],[3],[5]
Coupon rate on underlying collateral			3.75%	[2],[3],[5]
Maturity date of securities			2018-10	[2],[3],[5]
Description			Barclays Capital Inc. Collateralized by Par Value $8,390 Sovereign Government Bond, Coupon 3.75%, Maturity Date 10/18	[2],[3],[5]
Rate			-0.10%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			9,712,000	[2],[3],[5]
Repurchase Agreements [Member] | Bank of America Collateralized By Par Value $7,410 U.S. Treasury Note Coupon, 2.25% Maturity Date 2024-11[Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			7,465,000	[2],[3],[5]
Securities collateralized by par value			7,410,000	[2],[3],[5]
Coupon rate on underlying collateral			2.25%	[2],[3],[5]
Maturity date of securities			2024-11	[2],[3],[5]
Description			Bank of America Collateralized by Par Value $7,410 U.S. Treasury Note, Coupon 2.25%, Maturity Date 11/24	[2],[3],[5]
Rate			-0.22%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			7,465,000	[2],[3],[5]
Repurchase Agreements [Member] | Barclays Capital Inc. Collateralized By Par Value $6,393 Sovereign Government Bond, Coupon 4.00% Maturity Date 2016-09 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			6,888,000	[2],[3],[5]
Securities collateralized by par value			6,393,000	[2],[3],[5]
Coupon rate on underlying collateral			4.00%	[2],[3],[5]
Maturity date of securities			2016-09	[2],[3],[5]
Description			Barclays Capital Inc. Collateralized by Par Value $6,393 Sovereign Government Bond, Coupon 4.00%, Maturity Date 9/16	[2],[3],[5]
Rate			0.15%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			6,888,000	[2],[3],[5]
Repurchase Agreements [Member] | Pierpont Securities LLC Collateralized By Par Value $5,000 US Treasury Note Coupon, 1.25% Maturity Date 2018-10 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			4,975,000	[2],[3],[5]
Securities collateralized by par value			5,000,000	[2],[3],[5]
Coupon rate on underlying collateral			1.25%	[2],[3],[5]
Maturity date of securities			2018-10	[2],[3],[5]
Description			Pierpont Securities LLC Collateralized by Par Value $5,000 U.S. Treasury Note, Coupon 1.25%, Maturity Date 10/18	[2],[3],[5]
Rate			-0.10%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			4,975,000	[2],[3],[5]
Repurchase Agreements [Member] | Bank of America Collateralized By Par Value $3,354 US Treasury Note Coupon 2.25% Maturity Date 2024-11 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			3,379,000	[2],[3],[5]
Securities collateralized by par value			3,354,000	[2],[3],[5]
Coupon rate on underlying collateral			2.25%	[2],[3],[5]
Maturity date of securities			2024-11	[2],[3],[5]
Description			Bank of America Collateralized by Par Value $3,354 U.S. Treasury Note, Coupon 2.25%, Maturity Date 11/24	[2],[3],[5]
Rate			-0.25%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			3,379,000	[2],[3],[5]
Repurchase Agreements [Member] | Pierpont Securities LLC Collateralized By Par Value $2,000 US Treasury Bond Coupon 3.13% Maturity Date 2044-08 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,173,000	[2],[3],[5]
Securities collateralized by par value			2,000,000	[2],[3],[5]
Coupon rate on underlying collateral			3.13%	[2],[3],[5]
Maturity date of securities			2044-08	[2],[3],[5]
Description			Pierpont Securities LLC Collateralized by Par Value $2,000 U.S. Treasury Bond, Coupon 3.13%, Maturity Date 8/44	[2],[3],[5]
Rate			-0.30%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			2,173,000	[2],[3],[5]
Repurchase Agreements [Member] | Deutsche Bank Securities Collateralized By Par Value $1,827 Sovereign Government Bond Coupon 2.75% Maturity Date 2019-04 [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount			2,063,000	[2],[3],[5]
Securities collateralized by par value			1,827,000	[2],[3],[5]
Coupon rate on underlying collateral			2.75%	[2],[3],[5]
Maturity date of securities			2019-04	[2],[3],[5]
Description			Deutsche Bank Securities Collateralized by Par Value $1,827 Sovereign Government Bond, Coupon 2.75%, Maturity Date 4/19	[2],[3],[5]
Rate			-0.10%	[2],[3],[5]
Investments maturity date			2015-01	[2],[3],[5]
Fair value repurchase agreements			2,063,000	[2],[3],[5]
North America [Member] | Repurchase Agreements [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	24,046,000		140,248,000
Fair value repurchase agreements	24,046,000		140,248,000
Investment owned as a percentage of equity	3.06%		17.78%
Repurchase agreements, cost	24,046,000		140,248,000
Europe [Member] | Repurchase Agreements [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	20,709,000		31,753,000
Fair value repurchase agreements	20,708,000		31,753,000
Investment owned as a percentage of equity	2.64%		4.03%
Repurchase agreements, cost	$21,027,000		$31,753,000
[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]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,606,164 $1,823,880 $1,881,365 239.53 %Europe 56,061 57,497 48,278 6.15 %North America (Private Corporate Equity Investments) n/a 21,274 21,300 2.71 %Total $1,902,651 $1,950,943 248.39 %Investments Sold Short: North America (TBAs and Government Debt) (1,103,716) $(1,170,994) $(1,175,699) (149.69)%Europe (Government Debt) (19,039) (22,575) (20,183) (2.57)%Total $(1,122,755) $(1,193,569) $(1,195,882) (152.26)%Repurchase Agreements: North America 24,046 $24,046 $24,046 3.06 %Europe 20,709 21,027 20,708 2.64 %Total 44,755 $45,073 $44,754 5.70 %Financial Derivatives–Assets: North America 1,650,257 $45,179 $58,131 7.40 %Europe 159,342 33,420 31,713 4.04 %Total 1,809,599 $78,599 $89,844 11.44 %Financial Derivatives–Liabilities: North America (2,731,689) $(26,330) $(55,961) (7.13)%Europe (115,111) (10,854) (11,706) (1.49)%Total (2,846,800) $(37,184) $(67,667) (8.62)%
[5]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Properties/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,863,057 $2,038,249 $2,092,959 264.46 %Europe 69,724 69,360 64,611 9.16 %North America (Private Corporate Equity Investments) n/a 14,717 14,512 1.84 %Total $2,122,326 $2,172,082 275.46 %Investments Sold Short: North America (TBAs and Government Debt) (1,159,703) $(1,230,478) $(1,234,248) (156.53)%Europe (Government Debt) (28,118) (32,008) (30,606) (3.88)%North America (Common Stock) (2,986) (27,605) (26,516) (3.36)%Total $(1,290,091) $(1,291,370) (163.77)%Repurchase Agreements: North America 140,248 $140,248 $140,248 17.78 %Europe 31,753 31,753 31,753 4.03 %Total 172,001 $172,001 $172,001 21.81 %Financial Derivatives–Assets: North America 1,401,261 $61,560 $80,029 10.15 %Europe — — — — %Total 1,401,261 $61,560 $80,029 10.15 %Financial Derivatives–Liabilities: North America (936,799) $(30,598) $(63,084) (8.00)%Europe (37,199) (2,957) (3,032) (0.39)%Total (973,998) $(33,555) $(66,116) (8.39)%
[6]	Classification percentages are based on Total Equity.

Consolidated_Condensed_Schedul2

Consolidated Condensed Schedule Of Investments (Investments Sold Short) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-	($1,195,882)		($1,291,370)
Proceeds from investments sold short	-1,193,569		-1,290,091
TBA - Fixed Rate Agency Securities Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	-147.03%	[1],[2],[3],[4]	-153.39%	[1],[2],[5],[6]
Current Principal/Notional Amount	-1,083,180		-1,135,218
Investments sold short, at fair value-	-1,154,779	[2],[3],[4]	-1,209,539	[2],[5],[6]
Proceeds from investments sold short	-1,150,419	[2],[3],[4]	-1,205,876	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 3.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-184,782	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-194,115	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-129,638	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-138,621	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 3.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-93,880	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-99,615	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 4.00% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-85,300	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-90,978	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 3.50% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-81,500	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-85,413	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-68,760	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-75,016	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 5.00% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-62,600	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-69,503	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 3.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-50,600	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-53,051	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.50% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-42,600	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-46,354	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 4.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-36,747	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-39,256	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 3.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-32,442	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-33,171	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 4.50% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-30,100	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-32,753	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.00% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-28,400	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-30,320	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 3.50% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-27,500	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-29,141	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.50% 2015-06 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-22,800	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2015-06	[2],[3],[4]
Investments sold short, at fair value-	-24,766	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 2.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-23,050	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	2.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-23,677	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 year) 3.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-16,880	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (15 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-17,927	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 year) 3.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-15,810	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (15 year)	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-16,556	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 4.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-11,481	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-12,507	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 4.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-11,170	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-11,805	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 5.00% 2015-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-8,800	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Investments maturity date	2015-05	[2],[3],[4]
Investments sold short, at fair value-	-9,752	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 5.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-7,900	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-8,762	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 5.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-6,860	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	5.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-7,727	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 5.00% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-2,280	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-2,535	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 5.50% 2015-04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-1,300	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	5.50%	[2],[3],[4]
Investments maturity date	2015-04	[2],[3],[4]
Investments sold short, at fair value-	-1,458	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-213,928	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-228,376	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-205,082	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-213,870	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-146,580	[2],[5],[6]
Description			Federal National Mortgage Association (15 year)	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-154,837	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-123,117	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (30 year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-131,254	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-92,080	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-99,968	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-54,100	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Investments maturity date			2015-02	[2],[5],[6]
Investments sold short, at fair value-			-59,698	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.00% 2015-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-48,150	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-53,193	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-48,800	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Investments maturity date			2015-02	[2],[5],[6]
Investments sold short, at fair value-			-52,889	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-38,360	[2],[5],[6]
Description			Federal National Mortgage Association (15 year)	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-39,870	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-36,081	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (30 year)	[2],[5],[6]
Rate			4.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-39,111	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-26,400	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (30 year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Investments maturity date			2015-02	[2],[5],[6]
Investments sold short, at fair value-			-28,071	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% 2015-02 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-21,840	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Investments maturity date			2015-02	[2],[5],[6]
Investments sold short, at fair value-			-23,255	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-20,300	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (15 year)	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-21,429	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 2.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-15,850	[2],[5],[6]
Description			Federal National Mortgage Association (15 year)	[2],[5],[6]
Rate			2.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-16,140	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-14,020	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (30 year)	[2],[5],[6]
Rate			3.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-14,579	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-7,900	[2],[5],[6]
Description			Federal National Mortgage Association (15 year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Investments maturity date			2015-02	[2],[5],[6]
Investments sold short, at fair value-			-8,365	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-6,860	[2],[5],[6]
Description			Federal National Mortgage Association (30 year)	[2],[5],[6]
Rate			5.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-7,673	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 5.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-6,000	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (30 year)	[2],[5],[6]
Rate			5.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-6,622	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-4,100	[2],[5],[6]
Description			Federal Home Loan Mortgage Corporation (15 year)	[2],[5],[6]
Rate			3.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-4,256	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal National Mortgage Association (15 Year) [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-3,270	[2],[5],[6]
Description			Other Federal National Mortgage Association (15 year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-3,465	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal Home Loan Mortgage Corporation (30 Year) [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-1,300	[2],[5],[6]
Description			Other Federal Home Loan Mortgage Corporation (30 year)
Rate			5.50%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-1,453	[2],[5],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal Home Loan Mortgage Corporation (15 Year) [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			-1,100	[2],[5],[6]
Description			Other Federal Home Loan Mortgage Corporation (15 year)	[2],[5],[6]
Rate			4.00%	[2],[5],[6]
Investments maturity date			2015-01	[2],[5],[6]
Investments sold short, at fair value-			-1,165	[2],[5],[6]
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	-117.75%		-121.95%
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	-29.28%		-31.44%
Government debt sold short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	-5.23%	[1],[2],[3]	-7.02%	[1],[2],[5]
Investments sold short, at fair value-	-41,103	[2],[3]	-55,315	[2],[5]
Proceeds from investments sold short	-43,150	[2],[3]	-56,610	[2],[5]
Government debt sold short [Member] | Sovereign Debt Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-19,039	[2],[3]	-28,118	[2],[5]
Description	European Sovereign Bond	[2],[3]	European Sovereign Bonds	[2],[5]
Investments sold short, at fair value-	-20,183	[2],[3]	-30,606	[2],[5]
Government debt sold short [Member] | US Treasury Notes Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-17,600	[2],[3]	-22,485	[2],[5]
Description	U.S. Treasury Note	[2],[3]	U.S. Treasury Note	[2],[5]
Investments sold short, at fair value-	-17,751	[2],[3]	-22,560	[2],[5]
Government debt sold short [Member] | US Treasury Bond Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	-2,936	[2],[3]	-2,000	[2],[5]
Description	U.S. Treasury Bond	[2],[3]	U.S. Treasury Bond	[2],[5]
Rate			3.13%	[2],[5]
Investments maturity date			2044-08	[2],[5]
Investments sold short, at fair value-	-3,169	[2],[3]	-2,149	[2],[5]
Government debt sold short [Member] | Minimum [Member] | Sovereign Debt Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	0.50%	[2],[3]	2.75%	[2],[5]
Investments maturity date	2016-09	[2],[3]	2016-09	[2],[5]
Government debt sold short [Member] | Minimum [Member] | US Treasury Notes Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	1.25%	[2],[3]	1.25%	[2],[5]
Investments maturity date	2018-10	[2],[3]	2018-10	[2],[5]
Government debt sold short [Member] | Minimum [Member] | US Treasury Bond Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	2.50%	[2],[3]
Investments maturity date	2044-08	[2],[3]
Government debt sold short [Member] | Maximum [Member] | Sovereign Debt Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	4.00%	[2],[3]	4.00%	[2],[5]
Investments maturity date	2019-11	[2],[3]	2019-04	[2],[5]
Government debt sold short [Member] | Maximum [Member] | US Treasury Notes Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	2.25%	[2],[3]	2.25%	[2],[5]
Investments maturity date	2025-02	[2],[3]	2024-11	[2],[5]
Government debt sold short [Member] | Maximum [Member] | US Treasury Bond Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	3.13%	[2],[3]
Investments maturity date	2045-02	[2],[3]
Common Stock Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity			-3.36%	[1],[2],[5]
Investments sold short, at fair value-			-26,516	[2],[5]
Proceeds from investments sold short			-27,605	[2],[5]
Common Stock Sold Short [Member] | Publicly Traded Real Estate Investment Trusts [Member]
Investments Sold, Not yet Purchased [Line Items]
Description			Publicly Traded Real Estate Investment Trusts	[2],[5]
Investments sold short, at fair value-			-26,516	[2],[5]
Investment Sold, Not yet Purchased, Balance, Shares			-2,986	[2],[5]
Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	-152.26%	[1],[2],[3]	-163.77%	[1],[2],[5]
Current Principal/Notional Amount	-1,122,755
Investments sold short, at fair value-	-1,195,882	[2],[3]	-1,291,370	[2],[5]
Proceeds from investments sold short	-1,193,569	[2],[3]	-1,290,091	[2],[5]
Europe [Member] | Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	-2.57%
Current Principal/Notional Amount	-19,039
Investments sold short, at fair value-	-20,183
Proceeds from investments sold short	-22,575
Europe [Member] | Sovereign Debt Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity			-3.88%
Current Principal/Notional Amount			-28,118
Investments sold short, at fair value-			-30,606
Proceeds from investments sold short			-32,008
North America [Member] | Common Stock Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity			-3.36%
Investments sold short, at fair value-			-26,516
Investment Sold, Not yet Purchased, Balance, Shares			-2,986
Proceeds from investments sold short			-27,605
North America [Member] | Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	-149.69%
Current Principal/Notional Amount	-1,103,716
Investments sold short, at fair value-	-1,175,699
Proceeds from investments sold short	-1,170,994
North America [Member] | Securities Sold Short Securities Sold Not Yet Purchased TBAs and Government Debt [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity			-156.53%
Current Principal/Notional Amount			-1,159,703
Investments sold short, at fair value-			-1,234,248
Proceeds from investments sold short			($1,230,478)
[1]	Classification percentages are based on Total Equity.
[2]	See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[3]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,606,164 $1,823,880 $1,881,365 239.53 %Europe 56,061 57,497 48,278 6.15 %North America (Private Corporate Equity Investments) n/a 21,274 21,300 2.71 %Total $1,902,651 $1,950,943 248.39 %Investments Sold Short: North America (TBAs and Government Debt) (1,103,716) $(1,170,994) $(1,175,699) (149.69)%Europe (Government Debt) (19,039) (22,575) (20,183) (2.57)%Total $(1,122,755) $(1,193,569) $(1,195,882) (152.26)%Repurchase Agreements: North America 24,046 $24,046 $24,046 3.06 %Europe 20,709 21,027 20,708 2.64 %Total 44,755 $45,073 $44,754 5.70 %Financial Derivatives–Assets: North America 1,650,257 $45,179 $58,131 7.40 %Europe 159,342 33,420 31,713 4.04 %Total 1,809,599 $78,599 $89,844 11.44 %Financial Derivatives–Liabilities: North America (2,731,689) $(26,330) $(55,961) (7.13)%Europe (115,111) (10,854) (11,706) (1.49)%Total (2,846,800) $(37,184) $(67,667) (8.62)%
[4]	At March 31, 2015, the Company's short investments guaranteed by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation represented 117.75% and 29.28% of equity, respectively.
[5]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Properties/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,863,057 $2,038,249 $2,092,959 264.46 %Europe 69,724 69,360 64,611 9.16 %North America (Private Corporate Equity Investments) n/a 14,717 14,512 1.84 %Total $2,122,326 $2,172,082 275.46 %Investments Sold Short: North America (TBAs and Government Debt) (1,159,703) $(1,230,478) $(1,234,248) (156.53)%Europe (Government Debt) (28,118) (32,008) (30,606) (3.88)%North America (Common Stock) (2,986) (27,605) (26,516) (3.36)%Total $(1,290,091) $(1,291,370) (163.77)%Repurchase Agreements: North America 140,248 $140,248 $140,248 17.78 %Europe 31,753 31,753 31,753 4.03 %Total 172,001 $172,001 $172,001 21.81 %Financial Derivatives–Assets: North America 1,401,261 $61,560 $80,029 10.15 %Europe — — — — %Total 1,401,261 $61,560 $80,029 10.15 %Financial Derivatives–Liabilities: North America (936,799) $(30,598) $(63,084) (8.00)%Europe (37,199) (2,957) (3,032) (0.39)%Total (973,998) $(33,555) $(66,116) (8.39)%
[6]	At December 31, 2014, the Company's short investments guaranteed by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation, represented 121.95% and 31.44% of equity, respectively.

Consolidated_Condensed_Schedul3

Consolidated Condensed Schedule Of Investments (Financial Derivatives) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
	contracts		contracts
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	$89,844,000	[1]	$80,029,000	[1]
Derivative Liabilities	-67,667,000	[1]	-66,116,000	[1]
Net cost	78,599,000		61,560,000
Net proceeds	-37,184,000		-33,555,000
Index multiplier	50
Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Future contract notional	1,000,000		1,000,000
Future contract	1		1
Long Index Future [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts	88
Long US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts	1,191		1,346
Purchased Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts	72		110
Purchased Options on Eurodollar Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Future contract notional	1,000,000
Future contract	1
Financial Derivatives - Assets [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset, Notional Amount	1,809,599,000		1,401,261,000
Derivative Asset	89,844,000	[2],[3]	80,029,000	[2],[4]
Investment owned as a percentage of equity	11.44%	[2],[3],[5]	10.15%	[2],[4],[5]
Net cost	78,599,000	[2],[3]	61,560,000	[2],[4]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[3],[6],[7]	Credit	[2],[4],[6]
Derivative Asset, Notional Amount	4,079,000	[2],[3],[6],[7]	3,734,000	[2],[4],[6]
Derivative Asset	88,000	[2],[3],[6],[7]	61,000	[2],[4],[6]
Net proceeds	-270,000	[2],[3],[6],[7]	-249,000	[2],[4],[6]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2037-12	[2],[3],[6],[7]	2037-12	[2],[4],[6]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2063-05	[2],[3],[6],[7]	2063-05	[2],[4],[6]
Financial Derivatives - Assets [Member] | Long Total Return Swaps Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Equity Market	[2],[3],[7],[8]	Equity Market	[2],[4],[8]
Derivative Asset, Notional Amount	62,021,000	[2],[3],[7],[8]	875,000	[2],[4],[8]
Range of expiration dates	2016-11	[2],[3],[7],[8]	2015-06	[2],[4],[8]
Derivative Asset	1,000	[2],[3],[7],[8]	8,000	[2],[4],[8]
Financial Derivatives - Assets [Member] | Long Total Return Swaps Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[3],[7],[9]
Derivative Asset, Notional Amount	13,129,000	[2],[3],[7],[9]
Derivative Asset	118,000	[2],[3],[7],[9]
Financial Derivatives - Assets [Member] | Long Total Return Swaps Credit Risk [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2016-03	[2],[3],[7],[9]
Financial Derivatives - Assets [Member] | Long Total Return Swaps Credit Risk [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2016-04	[2],[3],[7],[9]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[3],[6],[7]	Credit	[2],[4],[6]
Derivative Asset, Notional Amount	328,851,000	[2],[3],[6],[7]	311,983,000	[2],[4],[6]
Derivative Asset	50,536,000	[2],[3],[6],[7]	35,865,000	[2],[4],[6]
Net cost	51,271,000	[2],[3],[6],[7]	37,428,000	[2],[4],[6]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2017-12	[2],[3],[6],[7]	2017-12	[2],[4],[6]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2020-06	[2],[3],[6],[7]	2019-12	[2],[4],[6]
Financial Derivatives - Assets [Member] | Long Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[10],[2],[3],[7]	Interest Rates	[10],[2],[4]
Derivative Asset, Notional Amount	1,270,424,000	[10],[2],[3],[7]	1,017,067,000	[10],[2],[4]
Derivative Asset	21,688,000	[10],[2],[3],[7]	23,243,000	[10],[2],[4]
Net cost	620,000	[10],[2],[3],[7]
Financial Derivatives - Assets [Member] | Long Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2016-07	[10],[2],[3],[7]	2016-07	[10],[2],[4]
Financial Derivatives - Assets [Member] | Long Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2045-03	[10],[2],[3],[7]	2044-12	[10],[2],[4]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Securities [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[11],[2],[3],[7]	Credit	[11],[2],[4]
Derivative Asset, Notional Amount	-16,986,000	[11],[2],[3],[7]	-17,691,000	[11],[2],[4]
Derivative Asset	10,809,000	[11],[2],[3],[7]	11,387,000	[11],[2],[4]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2034-09	[11],[2],[3],[7]	2034-09	[11],[2],[4]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2036-05	[11],[2],[3],[7]	2036-05	[11],[2],[4]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[11],[2],[3],[7]	Credit	[11],[2],[4]
Derivative Asset, Notional Amount	-72,380,000	[11],[2],[3],[7]	-50,981,000	[11],[2],[4]
Derivative Asset	2,573,000	[11],[2],[3],[7]	1,820,000	[11],[2],[4]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2046-05	[11],[2],[3],[7]	2046-05	[11],[2],[4]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2057-10	[11],[2],[3],[7]	2052-10	[11],[2],[4]
Financial Derivatives - Assets [Member] | Short Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[12],[2],[3],[7]	Interest Rates	[12],[2],[4]
Derivative Asset, Notional Amount	-237,823,000	[12],[2],[3],[7]	-627,931,000	[12],[2],[4]
Derivative Asset	599,000	[12],[2],[3],[7]	5,411,000	[12],[2],[4]
Financial Derivatives - Assets [Member] | Short Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2018-03	[12],[2],[3],[7]	2016-10	[12],[2],[4]
Financial Derivatives - Assets [Member] | Short Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2045-02	[12],[2],[3],[7]	2044-12	[12],[2],[4]
Financial Derivatives - Assets [Member] | Short Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Equity Market	[2],[3],[7],[8]
Derivative Asset, Notional Amount	-89,620,000	[2],[3],[7],[8]
Range of expiration dates	2017-03	[2],[3],[7],[8]
Derivative Asset	0	[2],[3],[7],[8]
Financial Derivatives - Assets [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	86,412,000	[2],[3],[7]	77,795,000	[2],[4]
Investment owned as a percentage of equity	11.00%	[2],[3],[5],[7]	9.87%	[2],[4],[5]
Net cost	75,571,000	[2],[3],[7]	59,299,000	[2],[4]
Financial Derivatives - Assets [Member] | Long US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[13],[2],[3]	Interest Rates	[14],[2],[4]
Derivative Asset, Notional Amount	168,200,000	[13],[2],[3]	109,300,000	[14],[2],[4]
Range of expiration dates	2015-06	[13],[2],[3]	2015-03	[14],[2],[4]
Derivative Asset	993,000	[13],[2],[3]	162,000	[14],[2],[4]
Financial Derivatives - Assets [Member] | Long Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[15],[2],[3]	Interest Rates	[15],[2],[4]
Derivative Asset, Notional Amount	39,000,000	[15],[2],[3]	11,000,000	[15],[2],[4]
Range of expiration dates			2017-06	[15],[2],[4]
Derivative Asset	23,000	[15],[2],[3]	7,000	[15],[2],[4]
Financial Derivatives - Assets [Member] | Long Eurodollar Future [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2015-12	[15],[2],[3]
Financial Derivatives - Assets [Member] | Long Eurodollar Future [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2017-06	[15],[2],[3]
Financial Derivatives - Assets [Member] | Short Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure			Interest Rates	[15],[2],[4]
Derivative Asset, Notional Amount			-520,000,000	[15],[2],[4]
Derivative Asset			92,000	[15],[2],[4]
Financial Derivatives - Assets [Member] | Short Eurodollar Future [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates			2015-09	[15],[2],[4]
Financial Derivatives - Assets [Member] | Short Eurodollar Future [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates			2017-09	[15],[2],[4]
Financial Derivatives - Assets [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	1,016,000	[2],[3]	261,000	[2],[4]
Investment owned as a percentage of equity	0.13%	[2],[3],[5]	0.03%	[2],[4],[5]
Financial Derivatives - Assets [Member] | Purchased Payer Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[16],[2],[3]	Interest Rates	[16],[2],[4]
Derivative Asset, Notional Amount	45,000,000	[16],[2],[3]	822,800,000	[16],[2],[4]
Derivative Asset	2,212,000	[16],[2],[3]	344,000	[16],[2],[4]
Financial Derivatives - Assets [Member] | Purchased Payer Swaption [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2018-02	[16],[2],[3]	2015-01	[16],[2],[4]
Financial Derivatives - Assets [Member] | Purchased Payer Swaption [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2018-03	[16],[2],[3]	2015-06	[16],[2],[4]
Financial Derivatives - Assets [Member] | Option on CDS on Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[17],[2],[3]	Credit	[17],[2],[4]
Derivative Asset, Notional Amount	156,950,000	[17],[2],[3]	364,400,000	[17],[2],[4]
Range of expiration dates	2015-04	[17],[2],[3]
Derivative Asset	21,000	[17],[2],[3]	625,000	[17],[2],[4]
Financial Derivatives - Assets [Member] | Option on CDS on Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates			2015-01	[17],[2],[4]
Financial Derivatives - Assets [Member] | Option on CDS on Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates			2015-03	[17],[2],[4]
Financial Derivatives - Assets [Member] | Purchased Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[18],[2],[3]	Interest Rates	[19],[2],[4]
Derivative Asset, Notional Amount	7,200,000	[18],[2],[3]	11,000,000	[19],[2],[4]
Range of expiration dates	2015-05	[18],[2],[3]
Derivative Asset	77,000	[18],[2],[3]	20,000	[19],[2],[4]
Financial Derivatives - Assets [Member] | Purchased Options on U.S. Treasury Futures [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates			2015-02	[19],[2],[4]
Financial Derivatives - Assets [Member] | Purchased Options on U.S. Treasury Futures [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates			2015-03	[19],[2],[4]
Financial Derivatives - Assets [Member] | Purchased Options on Eurodollar Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[2],[20],[3]
Derivative Asset, Notional Amount	130,000,000	[2],[20],[3]
Range of expiration dates	2015-05	[2],[20],[3]
Derivative Asset	6,000	[2],[20],[3]
Financial Derivatives - Assets [Member] | Options [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	2,316,000	[2],[3]	989,000	[2],[4]
Investment owned as a percentage of equity	0.30%	[2],[3],[5]	0.13%	[2],[4],[5]
Net cost	2,928,000	[2],[3]	2,161,000	[2],[4]
Financial Derivatives - Assets [Member] | Short Currency Forward [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure			Currency	[2],[21],[4]
Derivative Asset, Notional Amount			-35,849,000	[2],[21],[4]
Range of expiration dates			2015-03	[2],[21],[4]
Derivative Asset			884,000	[2],[21],[4]
Financial Derivatives - Assets [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset			884,000	[2],[4]
Investment owned as a percentage of equity			0.11%	[2],[4],[5]
Financial Derivatives - Assets [Member] | Warrant [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Equity Market	[2],[22],[3]	Equity Market	[2],[22],[4]
Derivative Asset, Notional Amount	1,554,000	[2],[22],[3]	1,554,000	[2],[22],[4]
Derivative Asset	100,000	[2],[22],[3]	100,000	[2],[22],[4]
Investment owned as a percentage of equity	0.01%	[2],[22],[3],[5]	0.01%	[2],[22],[4],[5]
Net cost	100,000	[2],[22],[3]	100,000	[2],[22],[4]
Financial Derivatives - Liabilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liability, Notional Amount	-2,846,800,000		-973,998,000
Derivative Liabilities	-67,667,000	[2],[3]	-66,116,000	[2],[4]
Investment owned as a percentage of equity	-8.62%	[2],[3],[5]	-8.39%	[2],[4],[5]
Net proceeds	-37,184,000	[2],[3]	-33,555,000	[2],[4]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[3],[6],[7]	Credit	[2],[23],[4],[6]
Derivative Liability, Notional Amount	30,225,000	[2],[3],[6],[7]	17,113,000	[2],[23],[4],[6]
Derivative Liabilities	-5,729,000	[2],[3],[6],[7]	-4,248,000	[2],[23],[4],[6]
Net proceeds	-6,874,000	[2],[3],[6],[7]	-5,160,000	[2],[23],[4],[6]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2049-03	[2],[3],[6],[7]	2049-03	[2],[23],[4],[6]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2052-10	[2],[3],[6],[7]	2052-10	[2],[23],[4],[6]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps Equity Market Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Equity Market	[2],[3],[7],[8]	Equity Market	[2],[23],[4],[8]
Derivative Liability, Notional Amount	4,093,000	[2],[3],[7],[8]	72,075,000	[2],[23],[4],[8]
Derivative Liabilities	-18,000	[2],[3],[7],[8]	-21,000	[2],[23],[4],[8]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps Equity Market Risk [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2015-06	[2],[3],[7],[8]	2015-01	[2],[23],[4],[8]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps Equity Market Risk [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2016-11	[2],[3],[7],[8]	2016-11	[2],[23],[4],[8]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps Credit Risk [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[3],[7],[9]
Derivative Liability, Notional Amount	14,326,000	[2],[3],[7],[9]
Derivative Liabilities	-307,000	[2],[3],[7],[9]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps Credit Risk [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2016-03	[2],[3],[7],[9]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps Credit Risk [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2016-04	[2],[3],[7],[9]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[3],[6],[7]	Credit	[2],[23],[4],[6]
Derivative Liability, Notional Amount	8,400,000	[2],[3],[6],[7]	3,756,000	[2],[23],[4],[6]
Range of expiration dates	2019-12	[2],[3],[6],[7]	2017-12	[2],[23],[4],[6]
Derivative Liabilities	-2,301,000	[2],[3],[6],[7]	-1,231,000	[2],[23],[4],[6]
Net proceeds	-2,478,000	[2],[3],[6],[7]	-1,200,000	[2],[23],[4],[6]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[3],[6],[7]	Credit	[2],[23],[4],[6]
Derivative Liability, Notional Amount	1,980,000	[2],[3],[6],[7]	4,428,000	[2],[23],[4],[6]
Derivative Liabilities	-771,000	[2],[3],[6],[7]	-2,706,000	[2],[23],[4],[6]
Net proceeds	-526,000	[2],[3],[6],[7]	-1,951,000	[2],[23],[4],[6]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bonds [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2019-06	[2],[3],[6],[7]	2019-06	[2],[23],[4],[6]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bonds [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2019-12	[2],[3],[6],[7]	2019-12	[2],[23],[4],[6]
Financial Derivatives - Liabilities [Member] | Long Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[10],[2],[3],[7]	Interest Rates	[10],[2],[23],[4]
Derivative Liability, Notional Amount	56,902,000	[10],[2],[3],[7]	230,410,000	[10],[2],[23],[4]
Derivative Liabilities	-191,000	[10],[2],[3],[7]	-678,000	[10],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Long Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2020-03	[10],[2],[3],[7]	2016-10	[10],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Long Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2045-04	[10],[2],[3],[7]	2044-12	[10],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swap On Asset Backed Securities [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[11],[2],[3],[7]	Credit	[11],[2],[23],[4]
Derivative Liability, Notional Amount	-3,000,000	[11],[2],[3],[7]	-3,000,000	[11],[2],[23],[4]
Range of expiration dates	2035-03	[11],[2],[3],[7]	2035-03	[11],[2],[23],[4]
Derivative Liabilities	-239,000	[11],[2],[3],[7]	-239,000	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[11],[2],[3],[7]	Credit	[11],[2],[23],[4]
Derivative Liability, Notional Amount	-16,725,000	[11],[2],[3],[7]	-20,050,000	[11],[2],[23],[4]
Range of expiration dates	2063-05	[11],[2],[3],[7]	2063-05	[11],[2],[23],[4]
Derivative Liabilities	-241,000	[11],[2],[3],[7]	-162,000	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[11],[2],[3],[7]	Credit	[11],[2],[23],[4]
Derivative Liability, Notional Amount	-284,968,000	[11],[2],[3],[7]	-352,945,000	[11],[2],[23],[4]
Derivative Liabilities	-28,976,000	[11],[2],[3],[7]	-27,357,000	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps On Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2016-12	[11],[2],[3],[7]	2016-12	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps On Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2020-06	[11],[2],[3],[7]	2019-12	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[12],[2],[3],[7]	Interest Rates	[12],[2],[23],[4]
Derivative Liability, Notional Amount	-1,580,221,000	[12],[2],[3],[7]	-1,024,716,000	[12],[2],[23],[4]
Derivative Liabilities	-25,134,000	[12],[2],[3],[7]	-28,727,000	[12],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2015-04	[12],[2],[3],[7]	2015-03	[12],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2045-03	[12],[2],[3],[7]	2044-11	[12],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[11],[2],[3],[7]	Credit	[11],[2],[23],[4]
Derivative Liability, Notional Amount	-9,970,000	[11],[2],[3],[7]	-5,970,000	[11],[2],[23],[4]
Derivative Liabilities	-368,000	[11],[2],[3],[7]	-247,000	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2019-09	[11],[2],[3],[7]	2019-09	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2020-03	[11],[2],[3],[7]	2019-12	[11],[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	-64,275,000	[2],[3],[7]	-65,616,000	[2],[23],[4]
Investment owned as a percentage of equity	-8.19%	[2],[3],[5],[7]	-8.32%	[2],[23],[4],[5]
Net proceeds	-34,113,000	[2],[3],[7]	-33,400,000	[2],[23],[4]
Financial Derivatives - Liabilities [Member] | Long Index Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[24],[3]
Derivative Liability, Notional Amount	9,067,000	[2],[24],[3]
Range of expiration dates	2015-06	[2],[24],[3]
Derivative Liabilities	-8,000	[2],[24],[3]
Financial Derivatives - Liabilities [Member] | Long US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure			Interest Rates	[14],[2],[4]
Derivative Liability, Notional Amount			50,600,000	[14],[2],[4]
Range of expiration dates			2015-03	[14],[2],[4]
Derivative Liabilities			-13,000	[14],[2],[4]
Financial Derivatives - Liabilities [Member] | Short Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Interest Rates	[15],[2],[3]	Interest Rates	[15],[2],[4]
Derivative Liability, Notional Amount	-645,000,000	[15],[2],[3]	-179,000,000	[15],[2],[4]
Derivative Liabilities	-417,000	[15],[2],[3]	-68,000	[15],[2],[4]
Financial Derivatives - Liabilities [Member] | Short Eurodollar Future [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2015-06	[15],[2],[3]	2015-03	[15],[2],[4]
Financial Derivatives - Liabilities [Member] | Short Eurodollar Future [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2017-09	[15],[2],[3]	2015-06	[15],[2],[4]
Financial Derivatives - Liabilities [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	-425,000	[2],[3]	-81,000	[2],[4]
Investment owned as a percentage of equity	-0.05%	[2],[3],[5]	-0.01%	[2],[4],[5]
Financial Derivatives - Liabilities [Member] | Purchased Payer Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure			Interest Rates	[16],[2],[4]
Derivative Liability, Notional Amount			260,000,000	[16],[2],[4]
Range of expiration dates			2015-03	[16],[2],[4]
Derivative Liabilities			-137,000	[16],[2],[4]
Financial Derivatives - Liabilities [Member] | Option on CDS on Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[25],[3]	Credit	[2],[25],[4]
Derivative Liability, Notional Amount	-218,500,000	[2],[25],[3]	-25,900,000	[2],[25],[4]
Range of expiration dates			2018-03	[2],[25],[4]
Derivative Liabilities	-431,000	[2],[25],[3]	-146,000	[2],[25],[4]
Financial Derivatives - Liabilities [Member] | Option on CDS on Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2015-04	[2],[25],[3]
Financial Derivatives - Liabilities [Member] | Option on CDS on Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2015-06	[2],[25],[3]
Financial Derivatives - Liabilities [Member] | Written Payer Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[26],[3]	Interest Rates	[2],[26],[4]
Derivative Liability, Notional Amount	-158,500,000	[2],[26],[3]	-10,200,000	[2],[26],[4]
Range of expiration dates			2015-01	[2],[26],[4]
Derivative Liabilities	-1,751,000	[2],[26],[3]	0	[2],[26],[4]
Financial Derivatives - Liabilities [Member] | Written Payer Swaption [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2018-02	[2],[26],[3]
Financial Derivatives - Liabilities [Member] | Written Payer Swaption [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	2018-03	[2],[26],[3]
Financial Derivatives - Liabilities [Member] | Written Straddle Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Credit	[2],[27],[3]
Derivative Liability, Notional Amount	-4,600,000	[2],[27],[3]
Range of expiration dates	2015-04	[2],[27],[3]
Derivative Liabilities	-68,000	[2],[27],[3]
Financial Derivatives - Liabilities [Member] | Options [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	-2,250,000	[2],[3]	-283,000	[2],[4]
Investment owned as a percentage of equity	-0.29%	[2],[3],[5]	-0.04%	[2],[4],[5]
Net proceeds	-3,071,000	[2],[3]	-155,000	[2],[4]
Financial Derivatives - Liabilities [Member] | Long Currency Forward [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Currency	[2],[28],[3]	Currency	[2],[28],[4]
Derivative Liability, Notional Amount	4,033,000	[2],[28],[3]	9,518,000	[2],[28],[4]
Range of expiration dates	2015-06	[2],[28],[3]	2015-03	[2],[28],[4]
Derivative Liabilities	-4,000	[2],[28],[3]	-136,000	[2],[28],[4]
Financial Derivatives - Liabilities [Member] | Short Currency Forward [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	Currency	[2],[21],[3]	Currency	[2],[21],[4]
Derivative Liability, Notional Amount	-54,342,000	[2],[21],[3]	-117,000	[2],[21],[4]
Range of expiration dates	2015-06	[2],[21],[3]	2015-03	[2],[21],[4]
Derivative Liabilities	-713,000	[2],[21],[3]	0	[2],[21],[4]
Financial Derivatives - Liabilities [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	-717,000	[2],[3]	-136,000	[2],[4]
Investment owned as a percentage of equity	-0.09%	[2],[3],[5]	-0.02%	[2],[4],[5]
North America [Member] | Financial Derivatives - Assets [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset, Notional Amount	1,650,257,000		1,401,261,000
Derivative Asset	58,131,000		80,029,000
Investment owned as a percentage of equity	7.40%		10.15%
Net cost	45,179,000		61,560,000
North America [Member] | Financial Derivatives - Liabilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liability, Notional Amount	-2,731,689,000		-936,799,000
Derivative Liabilities	-55,961,000		-63,084,000
Investment owned as a percentage of equity	-7.13%		-8.00%
Net proceeds	-26,330,000		-30,598,000
Europe [Member] | Financial Derivatives - Assets [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset, Notional Amount	159,342,000		0
Derivative Asset	31,713,000		0
Investment owned as a percentage of equity	4.04%		0.00%
Net cost	33,420,000		0
Europe [Member] | Financial Derivatives - Liabilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liability, Notional Amount	-115,111,000		-37,199,000
Derivative Liabilities	-11,706,000		-3,032,000
Investment owned as a percentage of equity	-1.49%		-0.39%
Net proceeds	($10,854,000)		($2,957,000)
Affiliates of Bank of America [Member] | Financial Derivatives - Assets [Member]
Investment Holdings, Other than Securities [Line Items]
Investment owned as a percentage of equity	5.08%
Affiliates of JP Morgan [Member] | Financial Derivatives - Liabilities [Member]
Investment Holdings, Other than Securities [Line Items]
Investment owned as a percentage of equity	-5.34%		-5.18%
[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]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,606,164 $1,823,880 $1,881,365 239.53 %Europe 56,061 57,497 48,278 6.15 %North America (Private Corporate Equity Investments) n/a 21,274 21,300 2.71 %Total $1,902,651 $1,950,943 248.39 %Investments Sold Short: North America (TBAs and Government Debt) (1,103,716) $(1,170,994) $(1,175,699) (149.69)%Europe (Government Debt) (19,039) (22,575) (20,183) (2.57)%Total $(1,122,755) $(1,193,569) $(1,195,882) (152.26)%Repurchase Agreements: North America 24,046 $24,046 $24,046 3.06 %Europe 20,709 21,027 20,708 2.64 %Total 44,755 $45,073 $44,754 5.70 %Financial Derivatives–Assets: North America 1,650,257 $45,179 $58,131 7.40 %Europe 159,342 33,420 31,713 4.04 %Total 1,809,599 $78,599 $89,844 11.44 %Financial Derivatives–Liabilities: North America (2,731,689) $(26,330) $(55,961) (7.13)%Europe (115,111) (10,854) (11,706) (1.49)%Total (2,846,800) $(37,184) $(67,667) (8.62)%
[4]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Properties/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,863,057 $2,038,249 $2,092,959 264.46 %Europe 69,724 69,360 64,611 9.16 %North America (Private Corporate Equity Investments) n/a 14,717 14,512 1.84 %Total $2,122,326 $2,172,082 275.46 %Investments Sold Short: North America (TBAs and Government Debt) (1,159,703) $(1,230,478) $(1,234,248) (156.53)%Europe (Government Debt) (28,118) (32,008) (30,606) (3.88)%North America (Common Stock) (2,986) (27,605) (26,516) (3.36)%Total $(1,290,091) $(1,291,370) (163.77)%Repurchase Agreements: North America 140,248 $140,248 $140,248 17.78 %Europe 31,753 31,753 31,753 4.03 %Total 172,001 $172,001 $172,001 21.81 %Financial Derivatives–Assets: North America 1,401,261 $61,560 $80,029 10.15 %Europe — — — — %Total 1,401,261 $61,560 $80,029 10.15 %Financial Derivatives–Liabilities: North America (936,799) $(30,598) $(63,084) (8.00)%Europe (37,199) (2,957) (3,032) (0.39)%Total (973,998) $(33,555) $(66,116) (8.39)%
[5]	Classification percentages are based on Total Equity.
[6]	For long credit default swaps, the Company sold protection.
[7]	The following table shows the Company's swap assets and liabilities by dealer as a percentage of Total Equity:Dealer/Parent Company Asset/Liability Percent of EquityAffiliates of Bank of America Financial derivatives—asset 5.08 %Affiliates of JP Morgan Financial derivatives—liability (5.34)%
[8]	Notional value represents number of underlying shares times the closing price of the underlying security.
[9]	Notional value represents outstanding principal balance on underlying corporate debt.
[10]	For long interest rate swap contracts, a floating rate is being paid and a fixed rate is being received.
[11]	For short credit default swaps, the Company purchased protection.
[12]	For short interest rate swap contracts, a fixed rate is being paid and a floating rate is being received.
[13]	Notional value represents the total face amount of U.S. Treasury Notes underlying all contracts held; as of March 31, 2015, 1,191 contracts were held.
[14]	Notional value represents the total face amount of U.S. Treasury Notes underlying all contracts held; as of December 31, 2014, 1,346 contracts were held.
[15]	Every $1,000,000 in notional value represents one contract.
[16]	Represents the option on the part of the Company to enter into an interest rate swap whereby the Company would pay a fixed rate and receive a floating rate.
[17]	Represents the option on the part of the Company to enter into a credit default swap on a corporate bond index whereby the Company would pay a fixed rate and receive credit protection payments.
[18]	Represents the option on the part of the Company to enter into a futures contract with a counterparty; as of March 31, 2015, 72 contracts were held.
[19]	Represents the option on the part of the Company to enter into a futures contract with a counterparty; as of December 31, 2014, 110 contracts were held.
[20]	Represents the option on the part of the Company to enter into a futures contract with a counterparty. Every $1,000,000 in notional value represents one contract.
[21]	Notional amount represents U.S. Dollars to be received by the Company at the maturity of the forward contract.
[22]	Notional amount represents number of warrants.
[23]	The following table shows the Company's swap liabilities by dealer as a percentage of Total Equity:Dealer/Parent Company Percent of EquityAffiliates of JP Morgan (5.18)%
[24]	Notional value represents the number of contracts held times 50 times the Index price at March 31, 2015; as of March 31, 2015, 88 contracts were held.
[25]	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 pay a fixed rate and receive credit protection payments.
[26]	Represents the option on the part of a counterparty to enter into an interest rate swap with the Company whereby the Company would receive a fixed rate and pay a floating rate.
[27]	Represents the combination of a written payer swaption and a written receiver swaption on the same underlying swap.
[28]	Notional amount represents U.S. Dollars to be paid by the Company at the maturity of the forward contract.

Consolidated_Statement_Of_Oper

Consolidated Statement Of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
INVESTMENT INCOME
Interest income	$26,513	$21,496	[1]
Other investment income	293	0	[1]
Total investment income	26,806	21,496	[1]
EXPENSES
Base management fee	2,952	2,364	[1]
Interest expense	2,986	2,627	[1]
Other investment related expenses	1,202	430	[1]
Compensation expense	367	327	[1]
Custody and other fees	428	408	[1]
Professional fees	716	641	[1]
Administration fees	339	293	[1]
Insurance expense	177	189	[1]
Directors' fees and expenses	74	73	[1]
Share-based LTIP expense	98	63	[1]
Total expenses	9,339	7,415	[1]
NET INVESTMENT INCOME	17,467	14,081	[1]
Net realized gain (loss) on:
Investments	9,734	9,843	[1]
Financial derivatives, excluding currency forwards	-5,834	1,700	[1]
Financial derivatives-currency forwards	5,796	-482	[1]
Foreign currency transactions	733	347	[1]
Total net realized gain (loss) on investments, financial derivatives, and foreign currency transactions	10,429	11,408	[1]
Change in net unrealized gain (loss) on:
Investments	693	-147	[1]
Financial derivatives, excluding currency forwards	-2,644	-2,602	[1]
Financial derivatives-currency forwards	-1,465	163	[1]
Foreign currency translation	-5,063	-65	[1]
Total Change in Net Unrealized Gain Loss On Investments, Financial derivatives, and Foreign currency translation	-8,479	-2,651	[1]
NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS, FINANCIAL DERIVATIVES, AND FOREIGN CURRENCY TRANSACTIONS/TRANSLATION	1,950	8,757	[1]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	19,417	22,838	[1]
Net Income (Loss) Attributable to Noncontrolling Interest	156	203	[1]
Net Income (Loss) Attributable to Parent	$19,261	$22,635	[1]
NET INCREASE IN SHAREHOLDERS' EQUITY RESULTING FROM OPERATIONS PER SHARE:
Basic and Diluted (in usd per share)	$0.57	$0.88	[1]
[1]	Conformed to current period presentation.

Consolidated_Statement_Of_Chan

Consolidated Statement Of Changes In Equity (USD $)		Total		Parent [Member]	Noncontrolling Interest [Member]
In Thousands, unless otherwise specified
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2013		$626,049
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2013					5,648
Stockholders' Equity Attributable to Parent at Dec. 31, 2013				620,401
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net investment income	[1]	14,081
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions	[1]	11,408
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation	[1]	-2,651
Net Income (Loss) Attributable to Parent		22,635	[1]	22,635
Net Income (Loss) Attributable to Noncontrolling Interest		203	[1]		203
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	[1]	22,838
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Shares issued in connection with incentive fee payment		309		309
Contributions from non-controlling interests		1,001			1,001
Dividends	[2]	-20,070	[3]	-19,907	-163
Distributions to non-controlling interest		-114			-114
Adjustment to non-controlling interest		0		-497	497
Share-based LTIP awards		63		62	1
Net increase (decrease) in equity from transactions		-18,811		-20,033	1,222
Net increase (decrease) in equity		4,027		2,602	1,425
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2014		630,076
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2014					7,073
Stockholders' Equity Attributable to Parent at Mar. 31, 2014				623,003
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2014		788,544
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2014		6,389			6,389
Stockholders' Equity Attributable to Parent at Dec. 31, 2014		782,155		782,155
CHANGE IN SHAREHOLDERS’ EQUITY RESULTING FROM OPERATIONS
Net investment income		17,467
Net realized gain (loss) on investments, financial derivatives, and foreign currency transactions		10,429
Change in net unrealized gain (loss) on investments, financial derivatives, and foreign currency translation		-8,479
Net Income (Loss) Attributable to Parent		19,261		19,261
Net Income (Loss) Attributable to Noncontrolling Interest		156			156
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		19,417
CHANGE IN EQUITY RESULTING FROM TRANSACTIONS
Shares issued in connection with incentive fee payment		0		0
Contributions from non-controlling interests		500			500
Dividends	[2]	-22,159	[3]	-22,022	-137
Distributions to non-controlling interest		-976			-976
Adjustment to non-controlling interest		0		0	0
Share-based LTIP awards		98		97	1
Net increase (decrease) in equity from transactions		-22,537		-21,925	-612
Net increase (decrease) in equity		-3,120		-2,664	-456
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2015		785,424
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2015		5,933			5,933
Stockholders' Equity Attributable to Parent at Mar. 31, 2015		$779,491		$779,491
[1]	Conformed to current period presentation.
[2]	For the three month periods ended March 31, 2015 and 2014, dividends totaling $0.65 and $0.77, 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.

Consolidated_Statement_Of_Chan1

Consolidated Statement Of Changes In Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends (in usd per share)	$0.65	$0.77

Consolidated_Statement_Of_Cash

Consolidated Statement Of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$19,417	$22,838	[1]
Reconciliation of the net increase in equity resulting from operations to net cash provided by (used in) operating activities:
Change in net unrealized (gain) loss on investments and financial derivatives, and foreign currency translation	7,625	2,624
Net realized (gain) loss on investments, financial derivatives, and foreign currency transactions	-10,658	-11,189
Amortization of premiums and accretion of discounts (net)	3,499	-3,553
Purchase of investments	-1,055,646	-712,690
Proceeds from disposition of investments	1,220,580	681,516
Proceeds from principal payments of investments	69,620	32,581
Proceeds from investments sold short	1,395,115	824,365
Repurchase of investments sold short	-1,499,316	-865,138
Payments made to open financial derivatives	-59,067	-10,416
Proceeds received to close financial derivatives	73,336	15,413
Proceeds received to open financial derivatives	23,555	6,309
Payments made to close financial derivatives	-51,273	-25,711
Shares issued in connection with incentive fee payment	0	309
Share-based LTIP expense	98	63	[1]
(Increase) decrease in assets:
Repurchase agreements	127,247	-1,913
Receivable for securities sold	7,253	50,164
Due from brokers	34,202	13,708
Interest and principal receivable	4,976	31
Other assets	-549	-147
Increase (decrease) in liabilities:
Due to brokers	10,554	11,098
Payable for securities purchased	17,529	38,762
Accounts payable and accrued expenses	420	471
Incentive fee payable	0	-3,091
Other liabilities	13	0
Interest and dividends payable	-366	-65
Base management fee payable	-10	0
Net cash provided by operating activities	338,154	66,339
Cash flows provided by (used in) financing activities:
Contributions from non-controlling interests	500	1,001
Dividends paid	-22,159	-20,070
Distributions to non-controlling Interest	-976	-114
Principal payments on securitized debt	-88	-24
Reverse repurchase agreements, net of repayments	-273,321	-60,259
Net cash used in financing activities	-296,044	-79,466
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	42,110	-13,127
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	114,140	183,489
CASH AND CASH EQUIVALENTS, END OF PERIOD	156,250	170,362
Supplemental disclosure of cash flow information:
Interest paid	3,239	2,693
Shares issued in connection with incentive fee payment (non-cash)	0	309
Share-based LTIP awards (non-cash)	98	63	[1]
Aggregate TBA trade activity (buys sells) (non-cash)	$8,544,037	$6,215,156
[1]	Conformed to current period presentation.

Organization_and_Investment_Ob

Organization and Investment Objective	3 Months Ended
	Mar. 31, 2015
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 99.4% 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 primarily acquires and manages mortgage-related assets, including residential mortgage-backed securities, or "RMBS," residential mortgage loans, commercial mortgage-backed securities, or "CMBS," commercial mortgage loans and other commercial real estate debt, real property and mortgage-related derivatives. The Company also invests in corporate debt and equity securities, consumer loans and asset-backed securities backed by consumer and commercial assets, or "ABS," non-mortgage-related derivatives and other financial assets, including private debt and equity investments in mortgage related entities.
	Ellington Financial Management LLC ("EFM" or the "Manager") is a registered investment adviser and a registered commodity pool operator that serves as the Manager to the Company pursuant to the terms of a management agreement (the "Management Agreement"). EFM is an affiliate of Ellington Management Group, L.L.C., 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_Policie

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies
	(A) Basis of Presentation: The Company's unaudited interim 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. The consolidated financial statements include the accounts of the Company, the Operating Partnership, and its subsidiaries. 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. In management's opinion, all material adjustments, considered necessary for a fair presentation of the Company's interim consolidated financial statements have been included and are only of a normal recurring nature. Interim results are not necessarily indicative of the results that may be expected for the entire fiscal year. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
	(B) Valuation: The Company applies ASC 820-10, Fair Value Measurement and Disclosures ("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 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, non-Agency mortgage-backed securities determined to have sufficiently observable market data, U.S. Treasury securities and certain sovereign debt, commonly traded derivatives, such as interest rate swaps, 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 RMBS, CMBS, ABS, and credit default swaps, or "CDS," on individual ABS, in each case where there is less price transparency. Also included in this category are residential and commercial mortgage loans, consumer loans, distressed corporate debt, non-listed equities, and private corporate equity investments.
	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. 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. 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," and other ABS, 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 MBS 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, although Agency interest only and inverse interest only RMBS are currently designated as Level 3 assets since they generally have less price transparency. Non-Agency MBS and other ABS are generally classified as either Level 2 or Level 3 based on analysis of available market data such as recent trades, executable bids, and reported "market color." 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 various 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. These 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.
	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.
	The Company's investments in distressed corporate debt are in the form of loans as well as total return swaps on loans. Valuations are typically based on prices of the underlying loans received from third-party pricing services. In determining the fair value of a distressed corporate debt investment, management may adjust the third-party prices received based on its good faith assessment of various factors relating to the debtor, such as the debtor's leverage ratio, an assessment of the debtor's ability to generate cash flow to service its debt, and the outlook for the debtor's overall industry, among other factors. These investments are designated as Level 3 assets. 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 in certain cases, where sufficient relevant data is not otherwise available, the original transaction price. These investments are also designated as Level 3 assets.
	The Company's repurchase and reverse repurchase agreements are carried at cost, which approximates fair value. Repurchase agreements 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 amount 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 under the heading, "Other investment 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 equivalents are recorded at cost plus accrued interest, which approximates fair value. 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.
	(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 swaptions, 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 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. Initial margin deposits are made upon entering into futures contracts and can 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.
	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, foreign currency forwards, options contracts, and warrants.
	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 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 and 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 also enters into repurchase agreement transactions with third-party broker-dealers 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 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 or 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. 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. Assets held pursuant to repurchase agreements are reflected as assets on the Consolidated Statement of Assets, Liabilities, and Equity. 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. Reverse repurchase agreements are carried at their contractual amounts, which approximate fair value as the debt is short-term in nature.
	(H) Securitized Debt: The Company entered into a resecuritization transaction in January 2012, which is accounted for as a collateralized borrowing. The asset contributed to the securitization was not derecognized but rather, the liability issued by the securitization was recorded to reflect the term financing of the re-securitized asset. Under ASC 825-10, the Company has elected to carry securitized debt at fair value.
	(I) 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.
	(J) 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.
	(K) 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.
	(L) Offering Costs/Underwriters' Discount: Offering costs and underwriters' discount are charged against shareholders' equity.
	(M) 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 and independent directors are amortized over the vesting period in accordance with ASC 718-10, Compensation—Stock Compensation. Costs associated with LTIP units issued to the Manager are amortized over the vesting period in accordance with ASC 505-50, Equity-Based Payments to Non-Employees. The vesting periods for LTIP units issued under the Ellington Incentive Plan for Individuals (the "Individual LTIP") to dedicated or partially dedicated personnel are typically one year and can be up to two years. The vesting periods of Individual LTIP units are typically one year for independent directors.
	(N) 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 9 for further discussion of non-controlling interests.
	(O) 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.
	(P) Shares Repurchased: Common shares that are repurchased by the Company subsequent to issuance decrease the total number of shares outstanding and issued.
	(Q) 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.
	(R) 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.
	(S) Income Taxes: The Company intends 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. As of March 31, 2015, certain subsidiaries of the Company have elected to be treated as corporations for U.S. federal income tax purposes.
	The Company follows the provisions of ASC 740-10, Income Taxes ("ASC 740-10"), 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, based on the technical merits of the position. The Company did not have any additions to unrecognized tax benefits resulting from tax positions related either to the current period or to 2014, 2013, 2012, or 2011 (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.
	To date there have been no material differences between the tax and U.S. GAAP bases of the Company's investments.
	(T) Recent Accounting Pronouncements: In June 2014, the FASB issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures ("ASU 2014-11"). This amends ASC 860, Transfers and Servicing ("ASC 860"), to require disclosure of repurchase-to-maturity transactions to be accounted for as secured borrowings rather than sales of an asset, and transfers of financial assets with a contemporaneous repo will no longer be evaluated to determine whether they should be accounted for on a combined basis as forward contracts. The new guidance also prescribes additional disclosures particularly on the nature of collateral pledged under repurchase agreements accounted for as secured borrowings. ASU 2014-11 is effective for interim and annual periods beginning after December 15, 2014. The adoption of ASC 860, as amended by ASU 2014-11 did not have a material impact on the Company's consolidated financial statements.
	In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern ("ASU 2014-15"). ASU 2014-15 requires management to perform interim and annual assessments of an entity's ability to continue as a going concern and to provide disclosure if events or conditions arise that would place substantial doubt on the entity's ability to continue as a going concern. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and subsequent interim and annual periods with early adoption permitted. The adoption of ASU 2014-15 is not expected to have a material impact on the Company's consolidated financial statements.
	In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis ("ASU 2015-02"). This amends ASC 810, Consolidation (ASC "810"), to improve targeted areas of consolidation guidance by simplifying the requirements of consolidation and placing more emphasis on risk of loss when determining a controlling financial interest. ASU 2015-02 is effective for the annual period ending after December 15, 2015, and subsequent interim and annual periods with early adoption permitted. The adoption of ASU 2015-02 is not expected to have a material impact on the Company's consolidated financial statements.

Valuation

Valuation	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015:
	Description		Level 1				Level 2				Level 3				Total
	Assets:		(In thousands)
	Cash and cash equivalents		$	156,250			$	—			$	—			$	156,250
	Investments, at fair value-
	Agency residential mortgage-backed securities		$	—			$	1,142,107			$	26,335			$	1,168,442
	U.S. Treasury securities		—				17,683				—				17,683
	Private label residential mortgage-backed securities		—				287,644				169,371				457,015
	Private label commercial mortgage-backed securities		—				—				52,214				52,214
	Commercial mortgage loans		—				—				38,918				38,918
	Residential mortgage loans		—				—				30,845				30,845
	Other asset-backed securities and loans		—				—				123,620				123,620
	Corporate debt		—				—				31,836				31,836
	Real estate owned		—				—				9,070				9,070
	Private corporate equity investments		—				—				21,300				21,300
	Total investments, at fair value		—				1,447,434				503,509				1,950,943
	Financial derivatives–assets, at fair value-
	Credit default swaps on asset-backed securities		—				—				10,809				10,809
	Credit default swaps on corporate bond indices		—				50,536				—				50,536
	Credit default swaps on asset-backed indices		—				2,661				—				2,661
	Interest rate swaps		—				22,287				—				22,287
	Total return swaps		—				1				118				119
	Swaptions		—				2,212				—				2,212
	Options		83				21				—				104
	Futures		1,016				—				—				1,016
	Warrants		—				—				100				100
	Total financial derivatives–assets, at fair value		1,099				77,718				11,027				89,844
	Description		Level 1				Level 2				Level 3				Total
	Assets (continued):		(In thousands)
	Repurchase agreements		$	—			$	44,754			$	—			$	44,754
	Total investments and financial derivatives–assets, at fair value and repurchase agreements		$	1,099			$	1,569,906			$	514,536			$	2,085,541
	Liabilities:
	Investments sold short, at fair value-
	Agency residential mortgage-backed securities		$	—			$	(1,154,779	)		$	—			$	(1,154,779	)
	Government debt		—				(41,103		)		—				(41,103		)
	Total investments sold short, at fair value		—				(1,195,882		)		—				(1,195,882		)
	Financial derivatives–liabilities, at fair value-
	Credit default swaps on corporate bond indices		—				(31,277		)		—				(31,277		)
	Credit default swaps on corporate bonds		—				(1,139		)		—				(1,139		)
	Credit default swaps on asset-backed indices		—				(5,970		)		—				(5,970		)
	Credit default swaps on asset-backed securities		—				—				(239		)		(239		)
	Interest rate swaps		—				(25,325		)		—				(25,325		)
	Total return swaps		—				(18		)		(307		)		(325		)
	Options		—				(431		)		—				(431		)
	Swaptions		—				(1,819		)		—				(1,819		)
	Futures		(425		)		—				—				(425		)
	Forwards		—				(717		)		—				(717		)
	Total financial derivatives–liabilities, at fair value		(425		)		(66,696		)		(546		)		(67,667		)
	Securitized debt(1)		—				—				(669		)		(669		)
	Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value		$	(425	)		$	(1,262,578	)		$	(1,215	)		$	(1,264,218	)
	-1	The asset subject to the resecuritization had a fair value of $2.1 million as of March 31, 2015, which is included on the Consolidated Schedule of Investments under Principal and Interest – Private Label Securities.
	The Company's reverse repurchase agreements are carried at cost, which approximates fair value. These liabilities are classified as Level 2 liabilities based on the adequacy of the collateral and their short term nature.
	There were no transfers of financial instruments between Level 1 and Level 2 during the three month period ended March 31, 2015.
	The following table identifies the significant unobservable inputs that affect the valuation of the Company's Level 3 assets and liabilities as of March 31, 2015:
		Fair Value				Valuation		Unobservable Input		Range								Weighted
	Description					Technique				Min				Max				Average
		(In thousands)
	Private label residential mortgage-backed securities (1)	$	121,922			Market Quotes		Non Binding Third-Party Valuation		$	1.81			$	165.5			$	70.23
	Other asset-backed securities	90,593				Market Quotes		Non Binding Third-Party Valuation		$	23.5			$	134			$	96.67
	Private label residential mortgage-backed securities	46,780				Discounted Cash Flows		Yield		6.2		%		18.3		%		8.9		%
								Projected Collateral Prepayments		20.5		%		82.9		%		49.3		%
								Projected Collateral Losses		3.7		%		33.3		%		16.5		%
								Projected Collateral Recoveries		0		%		23.3		%		10.4		%
							Projected Collateral Scheduled Amortization		0		%		57.5		%		23.8		%
																	100		%
Private label commercial mortgage-backed securities	17,718				Discounted Cash Flows		Yield		12.9		%		49.5		%		23.3		%
							Projected Collateral Losses		0		%		59.3		%		6.6		%
							Projected Collateral Recoveries		0		%		40.7		%		10		%
							Projected Collateral Scheduled Amortization		0		%		100		%		83.4		%
																	100		%
Corporate debt and non-exchange traded corporate equity	28,574				Market Quotes		Non Binding Third-Party Valuation		$	12.4			$	107.25			$	84.53
Corporate debt and warrants	8,500				Discounted Cash Flows		Yield		15		%		15		%		15		%
Other asset-backed securities and loans	33,027				Discounted Cash Flows		Yield		12		%		17.4		%		12.7		%
							Projected Collateral Prepayments		0		%		69.5		%		34.9		%
							Projected Collateral Losses		2		%		18.9		%		11		%
							Projected Collateral Recoveries		0		%		6.1		%		2.6		%
							Projected Collateral Scheduled Amortization		21.9		%		81.1		%		51.5		%
																	100		%
Private label commercial mortgage-backed securities	34,496				Market Quotes		Non Binding Third-Party Valuation		$	5.62			$	103.25			$	63.72
Performing commercial mortgage loans	29,441				Discounted Cash Flows		Yield		9.8		%		55.2		%		15.8		%
Non-performing commercial mortgage loans	9,477				Discounted Cash Flows		Yield		9.2		%		17.4		%		13.4		%
							Months to Resolution		4.7				6				5.4
Non-performing residential mortgage loan pools and real estate owned	39,915				Discounted Cash Flows		Yield		5.7		%		12		%		7		%
							Months to Resolution		4.3				169.9				38.6
Agency interest only residential mortgage-backed securities	21,914				Market Quotes		Non Binding Third-Party Valuation		$	3.46			$	24.5			$	10.69
Agency interest only residential mortgage-backed securities	4,421				Option Adjusted Spread ("OAS")		LIBOR OAS(2)		98				614				389
							Projected Collateral Prepayments		52.6		%		100		%		84.6		%
							Projected Collateral Scheduled Amortization		0		%		47.4		%		15.4		%
																	100		%
(continued)	Fair Value				Valuation		Unobservable Input		Range								Weighted
Description					Technique				Min				Max				Average
	(In thousands)
Credit default swaps on asset-backed securities	10,570				Net Discounted Cash Flows		Projected Collateral Prepayments		26.4		%		56.2		%		32.3		%
							Projected Collateral Losses		16		%		37		%		28.7		%
							Projected Collateral Recoveries		7.3		%		18.7		%		12.9		%
							Projected Collateral Scheduled Amortization		15.9		%		31.1		%		26.1		%
																	100		%
Total return swaps	(189		)		Market Quotes		Non Binding Third-Party Valuation (3)		$	69.67			$	99.75			$	70.26
Non-exchange traded preferred equity investment in commercial mortgage-related private partnership	8,171				Discounted Cash Flows		Yield		10		%		10		%		10		%
							Expected Holding Period (Months)		14				14				14
Non-exchange traded preferred and common equity investment in mortgage-related entities	7,991				Recent Transactions		Transaction Price		N/A				N/A				N/A
-1	Includes securitized debt with a fair value of $0.7 million as of March 31, 2015.
-2	Shown in basis points.
-3	Represents valuations on underlying assets.
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, 2014:
(In thousands)
Description		Level 1				Level 2				Level 3				Total
Assets:
Cash and cash equivalents		$	114,140			$	—			$	—			$	114,140
Investments, at fair value-
Agency residential mortgage-backed securities		$	—			$	1,258,699			$	31,385			$	1,290,084
U.S. Treasury securities		—				1,636				—				1,636
Private label residential mortgage-backed securities		—				284,748				274,369				559,117
Private label commercial mortgage-backed securities		—				—				53,311				53,311
Commercial mortgage loans		—				—				28,309				28,309
Residential mortgage loans		—				—				27,482				27,482
Other asset-backed securities and loans		—				—				146,288				146,288
Corporate debt		—				—				42,708				42,708
Real estate owned		—				—				8,635				8,635
Private corporate equity investments		—				—				14,512				14,512
Total investments, at fair value		—				1,545,083				626,999				2,172,082
Financial derivatives–assets, at fair value-
Credit default swaps on asset-backed securities		—				—				11,387				11,387
Credit default swaps on corporate bond indices		—				35,865				—				35,865
Credit default swaps on asset-backed indices		—				1,881				—				1,881
Interest rate swaps		—				28,654				—				28,654
Total return swaps		—				8				—				8
Swaptions		—				344				—				344
Options		—				645				—				645
Futures		261				—				—				261
Forwards		—				884				—				884
Warrants		—				—				100				100
Total financial derivatives–assets, at fair value		261				68,281				11,487				80,029
Repurchase agreements		—				172,001				—				172,001
Total investments and financial derivatives–assets, at fair value and repurchase agreements		$	261			$	1,785,365			$	638,486			$	2,424,112
Liabilities:
Investments sold short, at fair value-
Agency residential mortgage-backed securities		$	—			$	(1,209,539	)		$	—			$	(1,209,539	)
Government debt		—				(55,315		)		—				(55,315		)
Common stock		(26,516		)		—				—				(26,516		)
Total investments sold short, at fair value		(26,516		)		(1,264,854		)		—				(1,291,370		)
Financial derivatives–liabilities, at fair value-
Credit default swaps on corporate bond indices		—				(28,588		)		—				(28,588		)
Credit default swaps on corporate bonds		—				(2,953		)		—				(2,953		)
Credit default swaps on asset-backed indices		—				(4,410		)		—				(4,410		)
Credit default swaps on asset-backed securities		—				—				(239		)		(239		)
Interest rate swaps		—				(29,405		)		—				(29,405		)
Total return swaps		—				(21		)		—				(21		)
Options		—				(146		)		—				(146		)
Description		Level 1				Level 2				Level 3				Total
Financial derivatives–liabilities, at fair value (continued)-
Swaptions		—				(137		)		—				(137		)
Futures		(81		)		—				—				(81		)
Forwards		—				(136		)		—				(136		)
Total financial derivatives–liabilities, at fair value		(81		)		(65,796		)		(239		)		(66,116		)
Securitized debt(1)		—				—				(774		)		(774		)
Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value		$	(26,597	)		$	(1,330,650	)		$	(1,013	)		$	(1,358,260	)
-1	The asset subject to the resecuritization had a fair value of $2.2 million as of December 31, 2014, which is included on the Consolidated Schedule of Investments under Principal and Interest – Private Label Securities.
The Company's reverse repurchase agreements are carried at cost, which approximates fair value. These liabilities are classified as Level 2 liabilities based on the adequacy of the collateral and their short term nature.
There were no transfers of financial instruments between Level 1 and Level 2 during the year ended December 31, 2014.
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, 2014:
	Fair Value				Valuation		Unobservable Input		Range								Weighted
Description					Technique				Min				Max				Average
	(In thousands)
Private label residential mortgage-backed securities (1)	$	201,373			Market Quotes		Non Binding Third-Party Valuation		$	1.83			$	119.58			$	73.58
Other asset-backed securities	123,029				Market Quotes		Non Binding Third-Party Valuation		21.5				137				94.91
Private label residential mortgage-backed securities	72,222				Discounted Cash Flows		Yield		3		%		13.6		%		7		%
							Projected Collateral Prepayments		6.7		%		100		%		45.6		%
							Projected Collateral Losses		0		%		44.5		%		11.3		%
							Projected Collateral Recoveries		0		%		22.4		%		8		%
							Projected Collateral Scheduled Amortization		0		%		86.4		%		35.1		%
																	100		%
Private label commercial mortgage-backed securities	12,392				Discounted Cash Flows		Yield		12		%		51.1		%		23.7		%
							Projected Collateral Losses		0.1		%		2.5		%		0.7		%
							Projected Collateral Recoveries		0.9		%		13.5		%		6.2		%
							Projected Collateral Scheduled Amortization		85.3		%		99		%		93.1		%
																	100		%
Corporate debt, non-exchange traded corporate equity, and warrants	45,668				Discounted Cash Flows		Yield		7.5		%		24.3		%		13.3		%
							Non Binding Third-Party Valuation		73				108				95.08
Other asset-backed securities and loans	23,259				Discounted Cash Flows		Yield		0		%		14.4		%		9.1		%
							Projected Collateral Prepayments		62.7		%		62.7		%		62.7		%
							Projected Collateral Losses		4		%		4		%		4		%
							Projected Collateral Recoveries		1.7		%		1.7		%		1.7		%
							Projected Collateral Scheduled Amortization		31.6		%		31.6		%		31.6		%
																	100		%
	Fair Value				Valuation		Unobservable Input		Range								Weighted
Description					Technique				Min				Max				Average
(continued)	(In thousands)
Private label commercial mortgage-backed securities	40,919				Market Quotes		Non Binding Third-Party Valuation		$	5.62			$	103.25			$	66.56
Performing commercial mortgage loans	21,328				Discounted Cash Flows		Yield		9.2		%		13.1		%		10.3		%
Non-performing commercial mortgage loans	6,981				Discounted Cash Flows		Yield		15.3		%		20.1		%		16.4		%
							Months to Resolution		0.5				10.5				8.2
Non-performing residential mortgage loan pools and real estate owned	36,117				Discounted Cash Flows		Yield		6.1		%		12		%		7.3		%
							Months to Resolution		4.1				79.1				24.6
Agency interest only residential mortgage-backed securities	22,928				Market Quotes		Non Binding Third-Party Valuation		$	3.62			$	24.86			$	11.38
Agency interest only residential mortgage-backed securities	8,457				Option Adjusted Spread ("OAS")		LIBOR OAS(2)		(154		)		1,796				359
							Projected Collateral Prepayments		50.2		%		100		%		75.5		%
							Projected Collateral Scheduled Amortization		0		%		49.8		%		24.5		%
																	100		%
Credit default swaps on asset-backed securities	11,148				Net Discounted Cash Flows		Projected Collateral Prepayments		17.8		%		55.8		%		32.5		%
							Projected Collateral Losses		16.5		%		37.7		%		29.7		%
							Projected Collateral Recoveries		7.7		%		18.5		%		12.8		%
							Projected Collateral Scheduled Amortization		15.9		%		43.4		%		25		%
																	100		%
Non-exchange traded preferred equity investment in commercial mortgage-related private partnership	6,241				Discounted Cash Flows		Yield		10		%		10		%		10		%
							Expected Holding Period (Months)		17				17				17
Non-exchange traded preferred and common equity investment in mortgage-related entities	5,411				Recent Transactions		Transaction Price		N/A				N/A				N/A
-1	Includes securitized debt with a fair value of $0.8 million as of December 31, 2014.
-2	Shown in basis points.
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 three month periods ended March 31, 2015 and 2014 (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:
Three Month Period Ended March 31, 2015
(In thousands)	Ending				Accreted				Net Realized				Change in Net				Purchases/			Sales/			Transfers Into Level 3		Transfers Out of Level 3			Ending
	Balance as of				Discounts /				Gain/				Unrealized				Payments			Issuances								Balance as of
	31-Dec-14				(Amortized				(Loss)				Gain/(Loss)															31-Mar-15
					Premiums)
Assets:
Investments, at fair value-
Agency residential mortgage-backed securities	$	31,385			$	(2,006	)		$	471			$	(96	)		$	1,190		$	(4,609	)	$	—	$	—		$	26,335
Private label residential mortgage-backed securities	274,369				2,388				1,206				3,062				6,633			(39,423		)	23,221		(102,085		)	169,371
Private label commercial mortgage-backed securities	53,311				1,372				614				(1,900		)		15,594			(16,777		)	—		—			52,214
Commercial mortgage loans	28,309				539				—				17				24,291			(14,238		)	—		—			38,918
Residential mortgage loans	27,482				443				242				144				5,976			(3,442		)	—		—			30,845
Other asset-backed securities and loans	146,288				(6,340		)		772				(1,154		)		26,534			(42,480		)	—		—			123,620
Corporate debt	42,708				31				186				(580		)		11,605			(22,114		)	—		—			31,836
Real estate owned	8,635				—				84				537				2,471			(2,657		)	—		—			9,070
Private corporate equity investments	14,512				—				—				230				6,572			(14		)	—		—			21,300
Total investments, at fair value	626,999				(3,573		)		3,575				260				100,866			(145,754		)	23,221		(102,085		)	503,509
Financial derivatives–assets, at fair value-
Credit default swaps on asset-backed securities	11,387				—				401				(355		)		22			(646		)	—		—			10,809
Total return swaps	—				—				—				118				—			—			—		—			118
Warrants	100				—				—				—				—			—			—		—			100
Total financial derivatives– assets, at fair value	11,487				—				401				(237		)		22			(646		)	—		—			11,027
Total investments and financial derivatives–assets, at fair value	$	638,486			$	(3,573	)		$	3,976			$	23			$	100,888		$	(146,400	)	$	23,221	$	(102,085	)	$	514,536
Liabilities:
Financial derivatives–liabilities, at fair value-
Credit default swaps on asset-backed securities	$	(239	)		$	—			$	(19	)		$	—			$	—		$	19		$	—	$	—		$	(239	)
Total return swaps	—				—				—				(307		)		—			—			—		—			(307		)
Total financial derivatives– liabilities, at fair value	(239		)		—				(19		)		(307		)		—			19			—		—			(546		)
Securitized debt:
Securitized debt	(774		)		(2		)		—				19				88			—			—		—			(669		)
Total securitized debt	(774		)		(2		)		—				19				88			—			—		—			(669		)
Total financial derivatives– liabilities and securitized debt, at fair value	$	(1,013	)		$	(2	)		$	(19	)		$	(288	)		$	88		$	19		$	—	$	—		$	(1,215	)
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 March 31, 2015, as well as Level 3 financial instruments disposed of by the Company during the three month period ended March 31, 2015. For Level 3 financial instruments held by the Company at March 31, 2015, change in net unrealized gain (loss) of $(3.2) million, $(0.2) million, $(0.3) million, and $19.0 thousand, for the three month period ended March 31, 2015 relate to investments, financial derivatives–assets, financial derivatives–liabilities, and securitized debt, respectively.
As of March 31, 2015, the Company transferred $102.1 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 has led to greater price transparency for these assets, thereby making a Level 2 designation appropriate in the Company's view. However, changes in the volume of observable inputs for these assets, such as a decrease in the volume of observed trading, could impact price transparency, and thereby cause a change in the level designation for these assets in future periods.
In addition, as of March 31, 2015, the Company transferred $23.2 million of non-Agency RMBS from Level 2 to Level 3. Since year end, these securities have 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. Changes in these indications could impact price transparency, and thereby cause a change in the level designation in future periods.
Level 3—Fair Value Measurement Using Significant Unobservable Inputs:
Three Month Period Ended March 31, 2014
(In thousands)	Ending				Accreted				Net Realized				Change in				Purchases/			Sales/			Transfers Into Level 3		Transfers Out of Level 3			Ending
	Balance as of December 31, 2013				Discounts /				Gain/				Net				Payments			Issuances								Balance as of March 31, 2014
					(Amortized				(Loss)				Unrealized
					Premiums)								Gain/(Loss)
Assets:
Investments, at fair value-
Agency residential mortgage-backed securities	$	40,504			$	(2,289	)		$	35			$	751			$	2,554		$	(180	)	$	—	$	—		$	41,375
Private label residential mortgage-backed securities	580,772				5,385				23,460				(12,852		)		89,585			(196,267		)	—		—			490,083
Private label commercial mortgage-backed securities	32,994				205				872				1,515				37,769			(40,710		)	—		—			32,645
Commercial mortgage loans	23,887				563				2				(460		)		20,023			(10		)	—		—			44,005
Residential mortgage loans	24,062				—				18				(260		)		—			(254		)	—		—			23,566
Other asset-backed securities	38,069				159				(97		)		548				13,887			(5,108		)	—		—			47,458
Real estate owned	—				—				—				(4		)		101			—			—		—			97
Total investments, at fair value	740,288				4,023				24,290				(10,762		)		163,919			(242,529		)	—		—			679,229
Financial derivatives–assets, at fair value-
Credit default swaps on asset-backed securities	16,646				—				1,190				(1,210		)		39			(1,491		)	—		—			15,174
Total financial derivatives– assets, at fair value	16,646				—				1,190				(1,210		)		39			(1,491		)	—		—			15,174
Total investments and financial derivatives–assets, at fair value	$	756,934			$	4,023			$	25,480			$	(11,972	)		$	163,958		$	(244,020	)	$	—	$	—		$	694,403
Liabilities:
Financial derivatives– liabilities, at fair value-
Credit default swaps on asset-backed securities	$	(350	)		$	—			$	(19	)		$	—			$	—		$	19		$	—	$	—		$	(350	)
Total financial derivatives– liabilities, at fair value	(350		)		—				(19		)		—				—			19			—		—			(350		)
Securitized debt:
Securitized debt	(983		)		(7		)		—				(17		)		24			—			—		—			(983		)
Total securitized debt	(983		)		(7		)		—				(17		)		24			—			—		—			(983		)
Total financial derivatives– liabilities and securitized debt, at fair value	$	(1,333	)		$	(7	)		$	(19	)		$	(17	)		$	24		$	19		$	—	$	—		$	(1,333	)
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 March 31, 2014, as well as Level 3 financial instruments disposed of by the Company during the three month period ended March 31, 2014. For Level 3 financial instruments held by the Company at March 31, 2014, change in net unrealized gain (loss) of $2.3 million, $(1.2) million, and $(17.0) thousand for the three month period ended March 31, 2014 relate to investments, financial derivatives–assets, and securitized debt, respectively.

To_Be_Announced_RMBS

To Be Announced RMBS	3 Months Ended
	Mar. 31, 2015
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 purchase 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 positions in long 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 March 31, 2015 and December 31, 2014:
		As of
		March 31, 2015			31-Dec-14
	Assets:	(In thousands)
	TBA securities, at fair value (Current principal: $26,990 and $71,598, respectively)	$	27,590		$	72,410
	Receivable for securities sold relating to unsettled TBA sales	1,150,060			1,205,779
	Liabilities:
	TBA securities sold short, at fair value (Current principal: -$1,083,180 and -$1,135,218, respectively)	$	(1,154,779	)	$	(1,209,539	)
	Payable for securities purchased relating to unsettled TBA purchases	(29,110		)	(71,832		)
	Net short TBA securities, at fair value	(1,127,189		)	(1,137,129		)

Financial_Derivatives

Financial Derivatives	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivatives	Financial Derivatives
	Gains and losses on the Company's derivative contracts for the three month periods ended March 31, 2015 and 2014 are summarized in the tables below:
	Three Month Period Ended March 31, 2015:
	Derivative Type		Primary Risk		Net Realized Gain/(Loss)				Change in Net Unrealized Gain/(Loss) for the Three Month Period Ended
			Exposure		for the Three Month				March 31, 2015(1)
					Period Ended
					31-Mar-15
	(In thousands)
	Financial derivatives–assets
	Credit default swaps on asset-backed securities		Credit		$	401			$	(355	)
	Credit default swaps on asset-backed indices		Credit		226				(1,252		)
	Credit default swaps on corporate bond indices		Credit		(3,014		)		828
	Total return swaps		Equity Market/Credit		1,810				110
	Interest rate swaps		Interest Rates		19,460				(6,987		)
	Futures		Interest Rates		2,398				824
	Forwards		Currency		7,285				(884		)
	Other		Credit/		(3,260		)		560
			Interest Rates
					25,306				(7,156		)
	Financial derivatives–liabilities
	Credit default swaps on asset-backed securities		Credit		(19		)		—
	Credit default swaps on asset-backed indices		Credit		145				206
	Credit default swaps on corporate bond indices		Credit		2,124				(2,656		)
	Credit default swaps on corporate bonds		Credit		(668		)		485
	Total return swaps		Equity Market/Credit		(458		)		(304		)
	Interest rate swaps		Interest Rates		(25,197		)		4,321
	Futures		Interest Rates/Equity Market		(32		)		(411		)
	Forwards		Currency		(1,489		)		(581		)
	Other		Credit/		250				948
			Interest Rates
					(25,344		)		2,008
	Total				$	(38	)		$	(5,148	)
	-1	Includes foreign currency translation on derivatives in the amount of $1.0 million which is shown on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation.
	Three Month Period Ended March 31, 2014:
	Derivative Type		Primary Risk		Net Realized Gain/(Loss)				Change in Net Unrealized Gain/(Loss) for the Three Month Period Ended
			Exposure		for the Three Month				31-Mar-14
					Period Ended
					31-Mar-14
	(In thousands)
	Financial derivatives–assets
	Credit default swaps on asset-backed securities		Credit		$	1,190			$	(1,210	)
	Credit default swaps on asset-backed indices		Credit		(1,302		)		145
	Credit default swaps on corporate bond indices		Credit		652				(315		)
	Total return swaps		Equity Market		5,925				10
	Interest rate swaps		Interest Rates		1,472				(6,080		)
	Futures		Interest Rates		41				2,435
	Forwards		Currency		10				167
	Other		Credit/		53				288
			Interest Rates
					8,041				(4,560		)
	Financial derivatives–liabilities
	Credit default swaps on asset-backed securities		Credit		(19		)		—
	Credit default swaps on asset-backed indices		Credit		2,603				(1,486		)
	Credit default swaps on corporate bond indices		Credit		(3,804		)		4,571
	Total return swaps		Equity Market		(1,417		)		36
	Interest rate swaps		Interest Rates		(3,765		)		(468		)
	Futures		Interest Rates		128				(139		)
	Forwards		Currency		(492		)		(4		)
	Other		Interest Rates		(57		)		(389		)
					(6,823		)		2,121
	Total				$	1,218			$	(2,439	)
	The tables below detail the average notional values of the Company's financial derivatives, using absolute value of month end notional values, for the three month period ended March 31, 2015 and the year ended December 31, 2014:
	Derivative Type		Three Month				Year Ended December 31, 2014
			Period Ended
31-Mar-15
		(In thousands)
Interest rate swaps		$	2,989,926			$	2,227,315
Credit default swaps		712,197				552,411
Total return swaps		115,026				55,108
Futures		1,137,642				738,830
Options		859,413				926,369
Forwards		61,478				42,143
Warrants		1,554				120
From time to time the Company enters into credit derivative contracts for which the Company sells credit protection ("written credit derivatives"). As of March 31, 2015 and December 31, 2014, 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 March 31, 2015 and December 31, 2014, are summarized below:
Credit Derivatives		Amount at				Amount at
		31-Mar-15				31-Dec-14
(In thousands)
Fair Value of Written Credit Derivatives, Net		$	41,823			$	27,741
Fair Value of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1)		$	(3,264	)		$	(3,287	)
Notional Amount of Written Credit Derivatives (2)		$	(373,535	)		$	(341,014	)
Notional Amount of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1)		$	49,638			$	54,874
-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 amount of written credit derivatives involving a particular underlying reference asset or index has been reduced (but not below zero) by the notional amount 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 paid up front ("points up front") is frequently used as an indication of credit risk. Credit protection sellers entering the market 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 both March 31, 2015 and December 31, 2014, periodic payment rates ranged between 15 and 500 basis points. Total net up-front payments received relating to written credit derivatives outstanding at March 31, 2015 and December 31, 2014 were $41.1 million and $28.9 million, respectively.

Borrowings_under_Reverse_Repur

Borrowings under Reverse Repurchase Agreements	3 Months Ended
	Mar. 31, 2015
Borrowings under Reverse Repurchase Agreements [Abstract]
Borrowings under Reverse Repurchase Agreements	Borrowings under 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. 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 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 interest is 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. 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 the Company must return to the counterparty the same security that had been posted. The contractual amount (loan amount) of the Company's reverse repurchase agreements approximates their fair value, as the debt is short-term in nature.
	In September 2014, the Company entered into a $150 million "non-mark-to-market" reverse repo facility which provides financing for certain types of non-Agency assets for a period of at least two years. After the first 18 months, the facility converts to a rolling facility with a six month cancellation notice period and automatic termination in September 2017. Under the terms of the facility, no additional collateral is required to be posted by the Company based on changes in market values of the underlying assets; however, all payments and prepayments of principal received on financed assets are applied to reduce the amount outstanding under the facility.
	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 sixteen counterparties as of both March 31, 2015 and December 31, 2014.
	At March 31, 2015, approximately 37% of open reverse repurchase agreements were with two counterparties. At December 31, 2014, approximately 23% of open reverse repurchase agreements were with one counterparty. As of March 31, 2015 remaining days to maturity on the Company's open reverse repurchase agreements ranged from 1 to 541 days and from 2 to 631 days as of December 31, 2014. Interest rates on the Company's open reverse repurchase agreements ranged from (0.22)% to 2.43% as of March 31, 2015 and from (1.50)% to 2.42% as of December 31, 2014. The negative interest rates at March 31, 2015 and December 31, 2014 were related to reverse repurchase agreements on U.S. Treasury securities.
	The following table details the Company's outstanding borrowings under reverse repurchase agreements by remaining maturity as of March 31, 2015 and December 31, 2014:
	(In thousands)	31-Mar-15					31-Dec-14
				Weighted Average					Weighted Average
	Remaining Maturity	Outstanding		Interest Rate		Remaining Days to Maturity	Outstanding		Interest Rate		Remaining Days to Maturity
		Borrowings					Borrowings
	30 Days or Less	$	503,021	0.41	%	16	$	715,194	0.22	%	14
	31-60 Days	336,857		0.67	%	45	322,874		0.52	%	44
	61-90 Days	281,189		0.52	%	73	289,276		0.52	%	71
	91-120 Days	22,413		0.56	%	105	—		—	%	—
	121-150 Days	—		—	%	—	21,236		2.03	%	139
	151-180 Days	87,741		1.11	%	164	123,484		1.25	%	162
	181-360 Days	23,503		0.47	%	227	47,768		0.85	%	274
	>360 Days	141,388		2.43	%	541	149,601		2.41	%	631
		$	1,396,112	0.75	%	102	$	1,669,433	0.65	%	105
	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. Not included above are reverse repurchase agreements that the Company may have entered into prior to period end for which delivery of the borrowed funds is not scheduled until after period end in the amount of $13.9 million and $50.1 million as of March 31, 2015 and December 31, 2014, respectively.
	As of March 31, 2015 and December 31, 2014, the fair value of investments transferred as collateral under outstanding borrowings under reverse repurchase agreements was $1.62 billion and $1.93 billion, respectively. Collateral transferred under outstanding borrowings as of March 31, 2015 include investments in the amount of $35.9 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 $14.0 million and additional securities with a fair value of $2.5 million as of March 31, 2015 as a result of margin calls from various counterparties. Collateral transferred under outstanding borrowings as of December 31, 2014 include investments in the amount of $145.5 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 $14.2 million and additional securities with a fair value of $12.5 million as of December 31, 2014 as a result of margin calls from various counterparties.

Base_Management_Fee_And_Incent

Base Management Fee And Incentive Fee	3 Months Ended
	Mar. 31, 2015
Base Management Fee And Incentive Fee [Abstract]
Base Management Fee and Incentive Fee	Base Management Fee and Incentive Fee
	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 March 13, 2014, the Board of Directors approved a Fifth 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.
	Summary information—For the three month periods ended March 31, 2015 and 2014, the total base management fee incurred was $3.0 million and $2.4 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 March 31, 2015 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 the three month periods ended March 31, 2015 and 2014.

LongTerm_Incentive_Plan_Units

Long-Term Incentive Plan Units	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Long-Term Incentive Plan Units	Long-Term Incentive Plan Units
	In 2007, the Company established the Manager LTIP and the Individual LTIP. Pursuant to the terms of the Manager LTIP, the Company issued 375,000 long-term incentive plan units to its Manager, which as of August 17, 2010 have been fully vested and expensed. Pursuant to the terms of the Individual LTIP, each year since inception the Company has issued annual awards to its independent directors and, beginning in 2010, issued awards to certain of its dedicated or partially dedicated personnel.
	Units held pursuant to the Individual LTIPs are generally exercisable by the holder at any time after vesting. Each unit is convertible into one common share. Costs associated with the Individual LTIPs are measured as of the grant date and expensed ratably over the vesting period. Total expense associated with Individual LTIPs for both the three month periods ended March 31, 2015 and 2014 was $0.1 million.
	Detailed below is a roll-forward of the Company's LTIP units outstanding for the three month periods ended March 31, 2015 and 2014:
		Three Month Period Ended			Three Month Period Ended
		31-Mar-15			31-Mar-14
		Manager	Director/	Total	Manager	Director/	Total
			Employee			Employee
	LTIP Units Outstanding (12/31/2014 and 12/31/2013, respectively)	375,000	54,314	429,314	375,000	36,052	411,052
	Granted	—	—	—	—	—	—
	Exercised	—	—	—	—	—	—
	LTIP Units Outstanding (3/31/2015 and 3/31/2014, respectively)	375,000	54,314	429,314	375,000	36,052	411,052
	LTIP Units Vested and Outstanding (3/31/2015 and 3/31/2014, respectively)	375,000	29,859	404,859	375,000	20,314	395,314

Noncontrolling_Interests

Non-controlling Interests	3 Months Ended
	Mar. 31, 2015
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 issued to 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 March 31, 2015, non-controlling interest related to the outstanding 212,000 OP Units represented an interest of approximately 0.6% in the Operating Partnership.
	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 distressed 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 March 31, 2015 these joint venture partners' interests in subsidiaries of the Company were $1.1 million, representing an approximately 5% interest in such subsidiaries.
	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	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Common Share Capitalization	Common Share Capitalization
	During the three month periods ended March 31, 2015 and 2014, the Board of Directors authorized dividends totaling $0.65 per share and $0.77 per share, respectively. Total dividends paid during the three month periods ended March 31, 2015 and 2014 were $22.2 million and $20.1 million, respectively.
	Detailed below is a roll-forward of the Company's common shares outstanding for the three month periods ended March 31, 2015 and 2014:
		Three Month	Three Month
		Period Ended	Period Ended
		31-Mar-15	31-Mar-14
	Common Shares Outstanding	33,449,678	25,428,186
	(12/31/2014 and 12/31/2013, respectively)
	Share Activity:
	Shares issued in connection with incentive fee payment	—	13,564
	Common Shares Outstanding	33,449,678	25,441,750
	(3/31/2015 and 3/31/2014, respectively)
	If all LTIP and OP Units that have been previously issued were to become fully vested and exchanged for common shares as of March 31, 2015 and 2014, the Company's issued and outstanding common shares would increase to 34,090,992 and 26,064,802 shares, respectively.
	On August 4, 2011, the Company's Board of Directors approved the adoption of a $10 million share repurchase program. 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. Repurchases are at the Company's discretion, subject to applicable law, share availability, price, and the Company's financial performance, among other considerations. As of March 31, 2015, the Company has repurchased 217,619 shares under its current share repurchase program at an aggregate cost of $4.5 million, or at an average per share price of $20.59.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	The components of the computation of basic and diluted EPS were as follows:
			Three Month Period Ended March 31,
			2015			2014
	(In thousands except share amounts)
	Net increase in shareholders' equity resulting from operations		$	19,261		$	22,635
	Add: Net increase in equity resulting from operations attributable to the participating non-controlling interest(1)		120			185
	Net increase in equity resulting from operations related to common shares, LTIP unit holders, and participating non-controlling interest		19,381			22,820
	Net increase in shareholders' equity resulting from operations available to common share and LTIP unit holders:
	Net increase in shareholders' equity resulting from operations– common shares		19,017			22,275
	Net increase in shareholders' equity resulting from operations– LTIP units		244			360
	Dividends Paid(2):
	Common shareholders		(21,743		)	(19,590		)
	LTIP unit holders		(279		)	(317		)
	Non-controlling interest		(137		)	(163		)
	Total dividends paid to common shareholders, LTIP unit holders, and non-controlling interest		(22,159		)	(20,070		)
	Undistributed (Distributed in excess of) earnings:
	Common shareholders		(2,726		)	2,685
	LTIP unit holders		(35		)	43
	Non-controlling interest		(17		)	22
	Total undistributed (distributed in excess of) earnings attributable to common shareholders, LTIP unit holders, and non-controlling interest		$	(2,778	)	$	2,750
	Weighted average shares outstanding (basic and diluted):
	Weighted average common shares outstanding		33,449,678			23,435,571
	Weighted average participating LTIP units		429,314			411,052
	Weighted average non-controlling interest units		212,000			212,000
	Basic earnings per common share:
	Distributed		$	0.65		$	0.77
	Undistributed (Distributed in excess of)		(0.08		)	0.11
			$	0.57		$	0.88
	Diluted earnings per common share:
	Distributed		$	0.65		$	0.77
	Undistributed (Distributed in excess of)		(0.08		)	0.11
			$	0.57		$	0.88
	-1	For the three month periods ended March 31, 2015 and 2014, excludes net increase in equity resulting from operations of $36.0 thousand and $18.0 thousand, respectively attributable to joint venture partners, which have non-participating interests as described in Note 9.
	-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	3 Months Ended
	Mar. 31, 2015
Risks and Uncertainties [Abstract]
Counterparty Risk	Counterparty Risk
	As of March 31, 2015, investments with an aggregate value of approximately $1.63 billion were held with dealers as collateral for various reverse repurchase agreements. The investments held as collateral include securities in the amount of $35.9 million that were sold prior to period end but for which such sale had not yet settled as of March 31, 2015.
	The following table details the percentage of such collateral held by counterparties who hold greater than 15% of the aggregate $1.63 billion in collateral for various reverse repurchase agreements as of March 31, 2015. In addition to the below, unencumbered investments, on a settlement date basis, of approximately $224.8 million were held in custody at the Bank of New York Mellon Corporation.
	Dealer	% of Total
		Collateral on
		Reverse Repurchase
		Agreements
	Royal Bank of Canada	19%
	Deutsche Bank	16%
	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 March 31, 2015:
	Dealer	% of Total Due
		from Brokers
	Morgan Stanley	24%
	J.P. Morgan Securities Inc.	24%
	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 March 31, 2015:
	Dealer	% of Total Receivable
		for Securities Sold
	CS First Boston	35%
	Citigroup	20%
	In addition the Company held cash and cash equivalents of $156.3 million and $114.1 million as of March 31, 2015 and December 31, 2014, respectively. The below table details the concentration of cash and cash equivalents held by each counterparty:
		As of
	Counterparty	March 31, 2015	31-Dec-14
	Bank of New York Mellon Corporation	67%	11%
	BlackRock Liquidity TempFund	32%	88%
	US Bank	1%	1%

Offsetting_of_Assets_and_Liabi

Offsetting of Assets and Liabilities	3 Months Ended
	Mar. 31, 2015
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 Condensed 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, repurchase agreements, and reverse repurchase agreements.
	The following tables present information about certain assets and liabilities representing financial instruments as of March 31, 2015 and December 31, 2014. 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.
	March 31, 2015:
	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		$	89,844		$	(44,608	)	$	—	$	(24,765	)	$	20,471
	Repurchase agreements		44,754			(44,754		)	—		—			—
	Liabilities
	Financial derivatives–liabilities		(67,667		)	44,608			—		18,005			(5,054		)
	Reverse repurchase agreements		(1,396,112		)	44,754			1,337,332		14,026			—
	December 31, 2014:
	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		$	80,029		$	(40,671	)	$	—	$	(5,578	)	$	33,780
	Repurchase agreements		172,001			(172,001		)	—		—			—
	Liabilities
	Financial derivatives–liabilities		(66,116		)	26,758			—		17,393			(21,965		)
	Reverse repurchase agreements		(1,669,433		)	172,001			1,483,187		14,245			—
	-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 March 31, 2015 and December 31, 2014 were $1.63 billion and $1.94 billion, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $17.6 million and $22.7 million, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $40.3 million and $23.2 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.

Contingencies_And_Commitments

Contingencies And Commitments	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments
	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 March 31, 2015 and December 31, 2014.
	The Company has entered into a purchase agreement whereby it has committed to purchase newly issued consumer loans originated by a third party over a term that expires in November 2015. As of March 31, 2015, the Company's remaining purchase commitment in connection with the purchase agreement is $46.3 million in total principal balance.
	Commitments and Contingencies Related to Investments in Mortgage Originators
	As of March 31, 2015, the Company had non-controlling investments in three mortgage originators. In connection with its investments, the Company has outstanding commitments and contingencies as described below.
	The Company has a commitment related to a mortgage originator in which the Company owns a subordinated debt interest. The Company has committed to make up to $4.0 million of additional subordinated debt investments subject to the satisfaction of certain requirements by the borrower and to the extent the borrower requests to increase its borrowings. The borrower can request up to $2.0 million on or before December 31, 2015 and the remaining $2.0 million on or before June 12, 2016.
	In connection with its interest in a second mortgage originator, the Company has entered into an agreement whereby it guarantees the performance of the mortgage originator under a warehouse facility. As of March 31, 2015, the Company's maximum guarantee was $2.5 million.
	In March 2015, the Company made an initial investment in a third mortgage originator in the form of preferred and common stock. In addition, the Company entered into a flow mortgage loan purchase and sale agreement with the mortgage originator whereby the Company has committed to purchase eligible residential mortgage loans, to the extent they are originated in accordance with the Company's specifications, in an amount of at least $200 million. The Company may opt to increase the amount purchased in its sole discretion based on its evaluation of mortgage loans previously purchased as well as market conditions.

Financial_Highlights

Financial Highlights	3 Months Ended
	Mar. 31, 2015
Financial Highlights [Abstract]
Financial Highlights	Financial Highlights
	Results of Operations for a Share Outstanding Throughout the Periods:
		Three Month Period Ended			Three Month Period Ended
		31-Mar-15			31-Mar-14
	Beginning Shareholders' Equity Per Share (12/31/2014 and 12/31/2013, respectively)	$	23.38		$	24.4
	Net Investment Income	0.52			0.55
	Net Realized/Unrealized Gains (Losses)	0.06			0.35
	Results of Operations Attributable to Equity	0.58			0.9
	Less: Results of Operations Attributable to Non-controlling Interests	—			(0.01		)
	Results of Operations Attributable to Shareholders' Equity(1)	0.58			0.89
	Dividends Paid to Common Shareholders	(0.65		)	(0.77		)
	Weighted Average Share Impact on Dividends Paid (2)	(0.01		)	(0.02		)
	Accretive (Dilutive) Effect of Share Issuances (Net of Offering Costs), Share Repurchases, and Adjustments to Non-controlling Interest	—			(0.01		)
	Ending Shareholders' Equity Per Share (3/31/2015 and 3/31/2014, respectively)(3)	$	23.3		$	24.49
	Shares Outstanding, end of period	33,449,678			25,441,750
	-1	Calculated based on average common shares outstanding and can differ from the calculation for EPS (See Note 11).
	-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 March 31, 2015 and 2014, shareholders' equity per share would be $23.01 and $24.10, 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)
		Three Month Period Ended		Three Month Period Ended
		31-Mar-15		31-Mar-14
	Total Return	2.47%		3.56%
	-1	Total return is calculated assuming reinvestment of distributions at shareholders' equity per share during the period.
	Additionally as a supplement to the above table, the Company also measures its total return assuming all convertible units were converted into common shares at their respective issuance dates. LTIP and OP Units outstanding at March 31, 2015 totaled 641,314 and represent 1.88% of total common shares and convertible units outstanding. LTIP and OP Units outstanding at March 31, 2014 totaled 623,052 and represent 2.39% of total common shares and convertible units outstanding. On that basis, the Company's total return for the three month period ended March 31, 2015 and March 31, 2014, were 2.51% and 3.69%, respectively.
	Market Based Total Return for a Shareholder:
	For the three month periods ended March 31, 2015 and 2014, the Company's market based total return based on the closing price as reported by the New York Stock Exchange was 2.96% and 8.44%, 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)
		Three Month Period Ended		Three Month Period Ended
		31-Mar-15		31-Mar-14
	Net Investment Income (2)	8.92%		9.07%
	-1	Average equity is calculated using month end values.
	-2	Includes all items of income and expense on an annualized basis.
	Expense Ratios to Average Equity: (1)(2)
		Three Month		Three Month
		Period Ended		Period Ended
		31-Mar-15		31-Mar-14
	Operating expenses, before interest expense and other investment related expenses	-2.63%		-2.81%
	Interest expense and other investment related expenses	-2.14%		-1.97%
	Total Expenses	-4.77%		-4.78%
	-1	Average equity is calculated using month end values.
	-2	Includes all items of income and expense on an annualized basis.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events
	On May 4, 2015, the Company's Board of Directors approved a dividend for the first quarter of 2015 in the amount of $0.65 per share payable on June 15, 2015 to shareholders of record as of June 1, 2015.

Significant_Accounting_Policie1

Significant Accounting Policies (Policy)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The Company's unaudited interim 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. The consolidated financial statements include the accounts of the Company, the Operating Partnership, and its subsidiaries. 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. In management's opinion, all material adjustments, considered necessary for a fair presentation of the Company's interim consolidated financial statements have been included and are only of a normal recurring nature. Interim results are not necessarily indicative of the results that may be expected for the entire fiscal year. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
Valuation	Valuation: The Company applies ASC 820-10, Fair Value Measurement and Disclosures ("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 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, non-Agency mortgage-backed securities determined to have sufficiently observable market data, U.S. Treasury securities and certain sovereign debt, commonly traded derivatives, such as interest rate swaps, 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 RMBS, CMBS, ABS, and credit default swaps, or "CDS," on individual ABS, in each case where there is less price transparency. Also included in this category are residential and commercial mortgage loans, consumer loans, distressed corporate debt, non-listed equities, and private corporate equity investments.
	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. 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. 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," and other ABS, 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 MBS 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, although Agency interest only and inverse interest only RMBS are currently designated as Level 3 assets since they generally have less price transparency. Non-Agency MBS and other ABS are generally classified as either Level 2 or Level 3 based on analysis of available market data such as recent trades, executable bids, and reported "market color." 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 various 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. These 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.
	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.
	The Company's investments in distressed corporate debt are in the form of loans as well as total return swaps on loans. Valuations are typically based on prices of the underlying loans received from third-party pricing services. In determining the fair value of a distressed corporate debt investment, management may adjust the third-party prices received based on its good faith assessment of various factors relating to the debtor, such as the debtor's leverage ratio, an assessment of the debtor's ability to generate cash flow to service its debt, and the outlook for the debtor's overall industry, among other factors. These investments are designated as Level 3 assets. 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 in certain cases, where sufficient relevant data is not otherwise available, the original transaction price. These investments are also designated as Level 3 assets.
	The Company's repurchase and reverse repurchase agreements are carried at cost, which approximates fair value. Repurchase agreements 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 amount 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 under the heading, "Other investment 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 equivalents are recorded at cost plus accrued interest, which approximates fair value. 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.
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 swaptions, 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 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. Initial margin deposits are made upon entering into futures contracts and can 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.
	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, foreign currency forwards, options contracts, and warrants.
	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 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.
Reverse Repurchase Agreements and Repurchase Agreements	Reverse Repurchase Agreements and 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 also enters into repurchase agreement transactions with third-party broker-dealers 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 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 or 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. 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. Assets held pursuant to repurchase agreements are reflected as assets on the Consolidated Statement of Assets, Liabilities, and Equity. 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. Reverse repurchase agreements are carried at their contractual amounts, which approximate fair value as the debt is short-term in nature.
Securitized Debt	Securitized Debt: The Company entered into a resecuritization transaction in January 2012, which is accounted for as a collateralized borrowing. The asset contributed to the securitization was not derecognized but rather, the liability issued by the securitization was recorded to reflect the term financing of the re-securitized asset. Under ASC 825-10, the Company has elected to carry securitized debt at fair value.
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.
Offering Costs/Underwriters' Discount	Offering Costs/Underwriters' Discount: Offering costs and underwriters' discount are charged against shareholders' equity.
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 and independent directors are amortized over the vesting period in accordance with ASC 718-10, Compensation—Stock Compensation. Costs associated with LTIP units issued to the Manager are amortized over the vesting period in accordance with ASC 505-50, Equity-Based Payments to Non-Employees. The vesting periods for LTIP units issued under the Ellington Incentive Plan for Individuals (the "Individual LTIP") to dedicated or partially dedicated personnel are typically one year and can be up to two years. The vesting periods of Individual LTIP units are typically one year for independent directors.
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 9 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 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 intends 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. As of March 31, 2015, certain subsidiaries of the Company have elected to be treated as corporations for U.S. federal income tax purposes.
	The Company follows the provisions of ASC 740-10, Income Taxes ("ASC 740-10"), 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, based on the technical merits of the position. The Company did not have any additions to unrecognized tax benefits resulting from tax positions related either to the current period or to 2014, 2013, 2012, or 2011 (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.
	To date there have been no material differences between the tax and U.S. GAAP bases of the Company's investments.
Recent Accounting Pronouncements	Recent Accounting Pronouncements: In June 2014, the FASB issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures ("ASU 2014-11"). This amends ASC 860, Transfers and Servicing ("ASC 860"), to require disclosure of repurchase-to-maturity transactions to be accounted for as secured borrowings rather than sales of an asset, and transfers of financial assets with a contemporaneous repo will no longer be evaluated to determine whether they should be accounted for on a combined basis as forward contracts. The new guidance also prescribes additional disclosures particularly on the nature of collateral pledged under repurchase agreements accounted for as secured borrowings. ASU 2014-11 is effective for interim and annual periods beginning after December 15, 2014. The adoption of ASC 860, as amended by ASU 2014-11 did not have a material impact on the Company's consolidated financial statements.
	In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern ("ASU 2014-15"). ASU 2014-15 requires management to perform interim and annual assessments of an entity's ability to continue as a going concern and to provide disclosure if events or conditions arise that would place substantial doubt on the entity's ability to continue as a going concern. ASU 2014-15 is effective for the annual period ending after December 15, 2016, and subsequent interim and annual periods with early adoption permitted. The adoption of ASU 2014-15 is not expected to have a material impact on the Company's consolidated financial statements.
	In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis ("ASU 2015-02"). This amends ASC 810, Consolidation (ASC "810"), to improve targeted areas of consolidation guidance by simplifying the requirements of consolidation and placing more emphasis on risk of loss when determining a controlling financial interest. ASU 2015-02 is effective for the annual period ending after December 15, 2015, and subsequent interim and annual periods with early adoption permitted. The adoption of ASU 2015-02 is not expected to have a material impact on the Company's consolidated financial statements.

Valuation_Tables

Valuation (Tables)	3 Months Ended
	Mar. 31, 2015
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, 2014:
	(In thousands)
	Description		Level 1				Level 2				Level 3				Total
	Assets:
	Cash and cash equivalents		$	114,140			$	—			$	—			$	114,140
	Investments, at fair value-
	Agency residential mortgage-backed securities		$	—			$	1,258,699			$	31,385			$	1,290,084
	U.S. Treasury securities		—				1,636				—				1,636
	Private label residential mortgage-backed securities		—				284,748				274,369				559,117
	Private label commercial mortgage-backed securities		—				—				53,311				53,311
	Commercial mortgage loans		—				—				28,309				28,309
	Residential mortgage loans		—				—				27,482				27,482
	Other asset-backed securities and loans		—				—				146,288				146,288
	Corporate debt		—				—				42,708				42,708
	Real estate owned		—				—				8,635				8,635
	Private corporate equity investments		—				—				14,512				14,512
	Total investments, at fair value		—				1,545,083				626,999				2,172,082
	Financial derivatives–assets, at fair value-
	Credit default swaps on asset-backed securities		—				—				11,387				11,387
	Credit default swaps on corporate bond indices		—				35,865				—				35,865
	Credit default swaps on asset-backed indices		—				1,881				—				1,881
	Interest rate swaps		—				28,654				—				28,654
	Total return swaps		—				8				—				8
	Swaptions		—				344				—				344
	Options		—				645				—				645
	Futures		261				—				—				261
	Forwards		—				884				—				884
	Warrants		—				—				100				100
	Total financial derivatives–assets, at fair value		261				68,281				11,487				80,029
	Repurchase agreements		—				172,001				—				172,001
	Total investments and financial derivatives–assets, at fair value and repurchase agreements		$	261			$	1,785,365			$	638,486			$	2,424,112
	Liabilities:
	Investments sold short, at fair value-
	Agency residential mortgage-backed securities		$	—			$	(1,209,539	)		$	—			$	(1,209,539	)
	Government debt		—				(55,315		)		—				(55,315		)
	Common stock		(26,516		)		—				—				(26,516		)
	Total investments sold short, at fair value		(26,516		)		(1,264,854		)		—				(1,291,370		)
	Financial derivatives–liabilities, at fair value-
	Credit default swaps on corporate bond indices		—				(28,588		)		—				(28,588		)
	Credit default swaps on corporate bonds		—				(2,953		)		—				(2,953		)
	Credit default swaps on asset-backed indices		—				(4,410		)		—				(4,410		)
	Credit default swaps on asset-backed securities		—				—				(239		)		(239		)
	Interest rate swaps		—				(29,405		)		—				(29,405		)
	Total return swaps		—				(21		)		—				(21		)
	Options		—				(146		)		—				(146		)
	Description		Level 1				Level 2				Level 3				Total
	Financial derivatives–liabilities, at fair value (continued)-
	Swaptions		—				(137		)		—				(137		)
	Futures		(81		)		—				—				(81		)
	Forwards		—				(136		)		—				(136		)
	Total financial derivatives–liabilities, at fair value		(81		)		(65,796		)		(239		)		(66,116		)
	Securitized debt(1)		—				—				(774		)		(774		)
	Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value		$	(26,597	)		$	(1,330,650	)		$	(1,013	)		$	(1,358,260	)
	-1	The asset subject to the resecuritization had a fair value of $2.2 million as of December 31, 2014, which is included on the Consolidated Schedule of Investments under Principal and Interest – Private Label Securities.
	The table below reflects the value of the Company's Level 1, Level 2, and Level 3 financial instruments at March 31, 2015:
	Description		Level 1				Level 2				Level 3				Total
	Assets:		(In thousands)
	Cash and cash equivalents		$	156,250			$	—			$	—			$	156,250
	Investments, at fair value-
	Agency residential mortgage-backed securities		$	—			$	1,142,107			$	26,335			$	1,168,442
	U.S. Treasury securities		—				17,683				—				17,683
	Private label residential mortgage-backed securities		—				287,644				169,371				457,015
	Private label commercial mortgage-backed securities		—				—				52,214				52,214
	Commercial mortgage loans		—				—				38,918				38,918
Residential mortgage loans		—				—				30,845				30,845
Other asset-backed securities and loans		—				—				123,620				123,620
Corporate debt		—				—				31,836				31,836
Real estate owned		—				—				9,070				9,070
Private corporate equity investments		—				—				21,300				21,300
Total investments, at fair value		—				1,447,434				503,509				1,950,943
Financial derivatives–assets, at fair value-
Credit default swaps on asset-backed securities		—				—				10,809				10,809
Credit default swaps on corporate bond indices		—				50,536				—				50,536
Credit default swaps on asset-backed indices		—				2,661				—				2,661
Interest rate swaps		—				22,287				—				22,287
Total return swaps		—				1				118				119
Swaptions		—				2,212				—				2,212
Options		83				21				—				104
Futures		1,016				—				—				1,016
Warrants		—				—				100				100
Total financial derivatives–assets, at fair value		1,099				77,718				11,027				89,844
Description		Level 1				Level 2				Level 3				Total
Assets (continued):		(In thousands)
Repurchase agreements		$	—			$	44,754			$	—			$	44,754
Total investments and financial derivatives–assets, at fair value and repurchase agreements		$	1,099			$	1,569,906			$	514,536			$	2,085,541
Liabilities:
Investments sold short, at fair value-
Agency residential mortgage-backed securities		$	—			$	(1,154,779	)		$	—			$	(1,154,779	)
Government debt		—				(41,103		)		—				(41,103		)
Total investments sold short, at fair value		—				(1,195,882		)		—				(1,195,882		)
Financial derivatives–liabilities, at fair value-
Credit default swaps on corporate bond indices		—				(31,277		)		—				(31,277		)
Credit default swaps on corporate bonds		—				(1,139		)		—				(1,139		)
Credit default swaps on asset-backed indices		—				(5,970		)		—				(5,970		)
Credit default swaps on asset-backed securities		—				—				(239		)		(239		)
Interest rate swaps		—				(25,325		)		—				(25,325		)
Total return swaps		—				(18		)		(307		)		(325		)
Options		—				(431		)		—				(431		)
Swaptions		—				(1,819		)		—				(1,819		)
Futures		(425		)		—				—				(425		)
Forwards		—				(717		)		—				(717		)
Total financial derivatives–liabilities, at fair value		(425		)		(66,696		)		(546		)		(67,667		)
Securitized debt(1)		—				—				(669		)		(669		)
Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value		$	(425	)		$	(1,262,578	)		$	(1,215	)		$	(1,264,218	)
-1	The asset subject to the resecuritization had a fair value of $2.1 million as of March 31, 2015, which is included on the Consolidated Schedule of Investments under Principal and Interest – Private Label Securities.
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 March 31, 2015:
		Fair Value				Valuation		Unobservable Input		Range								Weighted
	Description					Technique				Min				Max				Average
		(In thousands)
	Private label residential mortgage-backed securities (1)	$	121,922			Market Quotes		Non Binding Third-Party Valuation		$	1.81			$	165.5			$	70.23
	Other asset-backed securities	90,593				Market Quotes		Non Binding Third-Party Valuation		$	23.5			$	134			$	96.67
	Private label residential mortgage-backed securities	46,780				Discounted Cash Flows		Yield		6.2		%		18.3		%		8.9		%
								Projected Collateral Prepayments		20.5		%		82.9		%		49.3		%
								Projected Collateral Losses		3.7		%		33.3		%		16.5		%
								Projected Collateral Recoveries		0		%		23.3		%		10.4		%
								Projected Collateral Scheduled Amortization		0		%		57.5		%		23.8		%
																		100		%
	Private label commercial mortgage-backed securities	17,718				Discounted Cash Flows		Yield		12.9		%		49.5		%		23.3		%
								Projected Collateral Losses		0		%		59.3		%		6.6		%
								Projected Collateral Recoveries		0		%		40.7		%		10		%
								Projected Collateral Scheduled Amortization		0		%		100		%		83.4		%
																		100		%
	Corporate debt and non-exchange traded corporate equity	28,574				Market Quotes		Non Binding Third-Party Valuation		$	12.4			$	107.25			$	84.53
	Corporate debt and warrants	8,500				Discounted Cash Flows		Yield		15		%		15		%		15		%
	Other asset-backed securities and loans	33,027				Discounted Cash Flows		Yield		12		%		17.4		%		12.7		%
								Projected Collateral Prepayments		0		%		69.5		%		34.9		%
								Projected Collateral Losses		2		%		18.9		%		11		%
								Projected Collateral Recoveries		0		%		6.1		%		2.6		%
								Projected Collateral Scheduled Amortization		21.9		%		81.1		%		51.5		%
																		100		%
	Private label commercial mortgage-backed securities	34,496				Market Quotes		Non Binding Third-Party Valuation		$	5.62			$	103.25			$	63.72
	Performing commercial mortgage loans	29,441				Discounted Cash Flows		Yield		9.8		%		55.2		%		15.8		%
	Non-performing commercial mortgage loans	9,477				Discounted Cash Flows		Yield		9.2		%		17.4		%		13.4		%
								Months to Resolution		4.7				6				5.4
	Non-performing residential mortgage loan pools and real estate owned	39,915				Discounted Cash Flows		Yield		5.7		%		12		%		7		%
								Months to Resolution		4.3				169.9				38.6
	Agency interest only residential mortgage-backed securities	21,914				Market Quotes		Non Binding Third-Party Valuation		$	3.46			$	24.5			$	10.69
	Agency interest only residential mortgage-backed securities	4,421				Option Adjusted Spread ("OAS")		LIBOR OAS(2)		98				614				389
								Projected Collateral Prepayments		52.6		%		100		%		84.6		%
								Projected Collateral Scheduled Amortization		0		%		47.4		%		15.4		%
																		100		%
	(continued)	Fair Value				Valuation		Unobservable Input		Range								Weighted
	Description					Technique				Min				Max				Average
		(In thousands)
	Credit default swaps on asset-backed securities	10,570				Net Discounted Cash Flows		Projected Collateral Prepayments		26.4		%		56.2		%		32.3		%
								Projected Collateral Losses		16		%		37		%		28.7		%
								Projected Collateral Recoveries		7.3		%		18.7		%		12.9		%
								Projected Collateral Scheduled Amortization		15.9		%		31.1		%		26.1		%
																		100		%
	Total return swaps	(189		)		Market Quotes		Non Binding Third-Party Valuation (3)		$	69.67			$	99.75			$	70.26
	Non-exchange traded preferred equity investment in commercial mortgage-related private partnership	8,171				Discounted Cash Flows		Yield		10		%		10		%		10		%
								Expected Holding Period (Months)		14				14				14
	Non-exchange traded preferred and common equity investment in mortgage-related entities	7,991				Recent Transactions		Transaction Price		N/A				N/A				N/A
	-1	Includes securitized debt with a fair value of $0.7 million as of March 31, 2015.
	-2	Shown in basis points.
	-3	Represents valuations on underlying assets.
	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, 2014:
		Fair Value				Valuation		Unobservable Input		Range								Weighted
	Description					Technique				Min				Max				Average
		(In thousands)
	Private label residential mortgage-backed securities (1)	$	201,373			Market Quotes		Non Binding Third-Party Valuation		$	1.83			$	119.58			$	73.58
	Other asset-backed securities	123,029				Market Quotes		Non Binding Third-Party Valuation		21.5				137				94.91
	Private label residential mortgage-backed securities	72,222				Discounted Cash Flows		Yield		3		%		13.6		%		7		%
								Projected Collateral Prepayments		6.7		%		100		%		45.6		%
								Projected Collateral Losses		0		%		44.5		%		11.3		%
								Projected Collateral Recoveries		0		%		22.4		%		8		%
								Projected Collateral Scheduled Amortization		0		%		86.4		%		35.1		%
																		100		%
	Private label commercial mortgage-backed securities	12,392				Discounted Cash Flows		Yield		12		%		51.1		%		23.7		%
							Projected Collateral Losses		0.1		%		2.5		%		0.7		%
							Projected Collateral Recoveries		0.9		%		13.5		%		6.2		%
							Projected Collateral Scheduled Amortization		85.3		%		99		%		93.1		%
																	100		%
Corporate debt, non-exchange traded corporate equity, and warrants	45,668				Discounted Cash Flows		Yield		7.5		%		24.3		%		13.3		%
							Non Binding Third-Party Valuation		73				108				95.08
Other asset-backed securities and loans	23,259				Discounted Cash Flows		Yield		0		%		14.4		%		9.1		%
							Projected Collateral Prepayments		62.7		%		62.7		%		62.7		%
							Projected Collateral Losses		4		%		4		%		4		%
							Projected Collateral Recoveries		1.7		%		1.7		%		1.7		%
							Projected Collateral Scheduled Amortization		31.6		%		31.6		%		31.6		%
																	100		%
	Fair Value				Valuation		Unobservable Input		Range								Weighted
Description					Technique				Min				Max				Average
(continued)	(In thousands)
Private label commercial mortgage-backed securities	40,919				Market Quotes		Non Binding Third-Party Valuation		$	5.62			$	103.25			$	66.56
Performing commercial mortgage loans	21,328				Discounted Cash Flows		Yield		9.2		%		13.1		%		10.3		%
Non-performing commercial mortgage loans	6,981				Discounted Cash Flows		Yield		15.3		%		20.1		%		16.4		%
							Months to Resolution		0.5				10.5				8.2
Non-performing residential mortgage loan pools and real estate owned	36,117				Discounted Cash Flows		Yield		6.1		%		12		%		7.3		%
							Months to Resolution		4.1				79.1				24.6
Agency interest only residential mortgage-backed securities	22,928				Market Quotes		Non Binding Third-Party Valuation		$	3.62			$	24.86			$	11.38
Agency interest only residential mortgage-backed securities	8,457				Option Adjusted Spread ("OAS")		LIBOR OAS(2)		(154		)		1,796				359
							Projected Collateral Prepayments		50.2		%		100		%		75.5		%
							Projected Collateral Scheduled Amortization		0		%		49.8		%		24.5		%
																	100		%
Credit default swaps on asset-backed securities	11,148				Net Discounted Cash Flows		Projected Collateral Prepayments		17.8		%		55.8		%		32.5		%
							Projected Collateral Losses		16.5		%		37.7		%		29.7		%
							Projected Collateral Recoveries		7.7		%		18.5		%		12.8		%
							Projected Collateral Scheduled Amortization		15.9		%		43.4		%		25		%
																	100		%
Non-exchange traded preferred equity investment in commercial mortgage-related private partnership	6,241				Discounted Cash Flows		Yield		10		%		10		%		10		%
							Expected Holding Period (Months)		17				17				17
Non-exchange traded preferred and common equity investment in mortgage-related entities	5,411				Recent Transactions		Transaction Price		N/A				N/A				N/A
-1	Includes securitized debt with a fair value of $0.8 million as of December 31, 2014.
-2	Shown in basis points.
Fair Value Measurement Using Significant Unobservable Inputs	Level 3—Fair Value Measurement Using Significant Unobservable Inputs:
	Three Month Period Ended March 31, 2015
	(In thousands)	Ending				Accreted				Net Realized				Change in Net				Purchases/			Sales/			Transfers Into Level 3		Transfers Out of Level 3			Ending
		Balance as of				Discounts /				Gain/				Unrealized				Payments			Issuances								Balance as of
		31-Dec-14				(Amortized				(Loss)				Gain/(Loss)															31-Mar-15
						Premiums)
	Assets:
	Investments, at fair value-
	Agency residential mortgage-backed securities	$	31,385			$	(2,006	)		$	471			$	(96	)		$	1,190		$	(4,609	)	$	—	$	—		$	26,335
	Private label residential mortgage-backed securities	274,369				2,388				1,206				3,062				6,633			(39,423		)	23,221		(102,085		)	169,371
	Private label commercial mortgage-backed securities	53,311				1,372				614				(1,900		)		15,594			(16,777		)	—		—			52,214
	Commercial mortgage loans	28,309				539				—				17				24,291			(14,238		)	—		—			38,918
	Residential mortgage loans	27,482				443				242				144				5,976			(3,442		)	—		—			30,845
	Other asset-backed securities and loans	146,288				(6,340		)		772				(1,154		)		26,534			(42,480		)	—		—			123,620
	Corporate debt	42,708				31				186				(580		)		11,605			(22,114		)	—		—			31,836
	Real estate owned	8,635				—				84				537				2,471			(2,657		)	—		—			9,070
	Private corporate equity investments	14,512				—				—				230				6,572			(14		)	—		—			21,300
	Total investments, at fair value	626,999				(3,573		)		3,575				260				100,866			(145,754		)	23,221		(102,085		)	503,509
	Financial derivatives–assets, at fair value-
	Credit default swaps on asset-backed securities	11,387				—				401				(355		)		22			(646		)	—		—			10,809
	Total return swaps	—				—				—				118				—			—			—		—			118
	Warrants	100				—				—				—				—			—			—		—			100
	Total financial derivatives– assets, at fair value	11,487				—				401				(237		)		22			(646		)	—		—			11,027
	Total investments and financial derivatives–assets, at fair value	$	638,486			$	(3,573	)		$	3,976			$	23			$	100,888		$	(146,400	)	$	23,221	$	(102,085	)	$	514,536
	Liabilities:
	Financial derivatives–liabilities, at fair value-
	Credit default swaps on asset-backed securities	$	(239	)		$	—			$	(19	)		$	—			$	—		$	19		$	—	$	—		$	(239	)
	Total return swaps	—				—				—				(307		)		—			—			—		—			(307		)
	Total financial derivatives– liabilities, at fair value	(239		)		—				(19		)		(307		)		—			19			—		—			(546		)
	Securitized debt:
	Securitized debt	(774		)		(2		)		—				19				88			—			—		—			(669		)
	Total securitized debt	(774		)		(2		)		—				19				88			—			—		—			(669		)
	Total financial derivatives– liabilities and securitized debt, at fair value	$	(1,013	)		$	(2	)		$	(19	)		$	(288	)		$	88		$	19		$	—	$	—		$	(1,215	)
	Level 3—Fair Value Measurement Using Significant Unobservable Inputs:
	Three Month Period Ended March 31, 2014
	(In thousands)	Ending				Accreted				Net Realized				Change in				Purchases/			Sales/			Transfers Into Level 3		Transfers Out of Level 3			Ending
		Balance as of December 31, 2013				Discounts /				Gain/				Net				Payments			Issuances								Balance as of March 31, 2014
						(Amortized				(Loss)				Unrealized
						Premiums)								Gain/(Loss)
	Assets:
	Investments, at fair value-
	Agency residential mortgage-backed securities	$	40,504			$	(2,289	)		$	35			$	751			$	2,554		$	(180	)	$	—	$	—		$	41,375
	Private label residential mortgage-backed securities	580,772				5,385				23,460				(12,852		)		89,585			(196,267		)	—		—			490,083
	Private label commercial mortgage-backed securities	32,994				205				872				1,515				37,769			(40,710		)	—		—			32,645
	Commercial mortgage loans	23,887				563				2				(460		)		20,023			(10		)	—		—			44,005
	Residential mortgage loans	24,062				—				18				(260		)		—			(254		)	—		—			23,566
	Other asset-backed securities	38,069				159				(97		)		548				13,887			(5,108		)	—		—			47,458
	Real estate owned	—				—				—				(4		)		101			—			—		—			97
	Total investments, at fair value	740,288				4,023				24,290				(10,762		)		163,919			(242,529		)	—		—			679,229
	Financial derivatives–assets, at fair value-
	Credit default swaps on asset-backed securities	16,646				—				1,190				(1,210		)		39			(1,491		)	—		—			15,174
	Total financial derivatives– assets, at fair value	16,646				—				1,190				(1,210		)		39			(1,491		)	—		—			15,174
	Total investments and financial derivatives–assets, at fair value	$	756,934			$	4,023			$	25,480			$	(11,972	)		$	163,958		$	(244,020	)	$	—	$	—		$	694,403
	Liabilities:
	Financial derivatives– liabilities, at fair value-
	Credit default swaps on asset-backed securities	$	(350	)		$	—			$	(19	)		$	—			$	—		$	19		$	—	$	—		$	(350	)
	Total financial derivatives– liabilities, at fair value	(350		)		—				(19		)		—				—			19			—		—			(350		)
	Securitized debt:
	Securitized debt	(983		)		(7		)		—				(17		)		24			—			—		—			(983		)
	Total securitized debt	(983		)		(7		)		—				(17		)		24			—			—		—			(983		)
	Total financial derivatives– liabilities and securitized debt, at fair value	$	(1,333	)		$	(7	)		$	(19	)		$	(17	)		$	24		$	19		$	—	$	—		$	(1,333	)

To_Be_Announced_RMBS_Tables

To Be Announced RMBS (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014:
		As of
		March 31, 2015			31-Dec-14
	Assets:	(In thousands)
	TBA securities, at fair value (Current principal: $26,990 and $71,598, respectively)	$	27,590		$	72,410
	Receivable for securities sold relating to unsettled TBA sales	1,150,060			1,205,779
	Liabilities:
	TBA securities sold short, at fair value (Current principal: -$1,083,180 and -$1,135,218, respectively)	$	(1,154,779	)	$	(1,209,539	)
	Payable for securities purchased relating to unsettled TBA purchases	(29,110		)	(71,832		)
	Net short TBA securities, at fair value	(1,127,189		)	(1,137,129		)

Financial_Derivatives_Tables

Financial Derivatives (Tables)	3 Months Ended
	Mar. 31, 2015
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 three month periods ended March 31, 2015 and 2014 are summarized in the tables below:
	Three Month Period Ended March 31, 2015:
	Derivative Type		Primary Risk		Net Realized Gain/(Loss)				Change in Net Unrealized Gain/(Loss) for the Three Month Period Ended
			Exposure		for the Three Month				March 31, 2015(1)
					Period Ended
					31-Mar-15
	(In thousands)
	Financial derivatives–assets
	Credit default swaps on asset-backed securities		Credit		$	401			$	(355	)
	Credit default swaps on asset-backed indices		Credit		226				(1,252		)
	Credit default swaps on corporate bond indices		Credit		(3,014		)		828
	Total return swaps		Equity Market/Credit		1,810				110
	Interest rate swaps		Interest Rates		19,460				(6,987		)
	Futures		Interest Rates		2,398				824
	Forwards		Currency		7,285				(884		)
	Other		Credit/		(3,260		)		560
			Interest Rates
					25,306				(7,156		)
	Financial derivatives–liabilities
	Credit default swaps on asset-backed securities		Credit		(19		)		—
	Credit default swaps on asset-backed indices		Credit		145				206
	Credit default swaps on corporate bond indices		Credit		2,124				(2,656		)
	Credit default swaps on corporate bonds		Credit		(668		)		485
	Total return swaps		Equity Market/Credit		(458		)		(304		)
	Interest rate swaps		Interest Rates		(25,197		)		4,321
	Futures		Interest Rates/Equity Market		(32		)		(411		)
	Forwards		Currency		(1,489		)		(581		)
	Other		Credit/		250				948
			Interest Rates
					(25,344		)		2,008
	Total				$	(38	)		$	(5,148	)
	-1	Includes foreign currency translation on derivatives in the amount of $1.0 million which is shown on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation.
	Three Month Period Ended March 31, 2014:
	Derivative Type		Primary Risk		Net Realized Gain/(Loss)				Change in Net Unrealized Gain/(Loss) for the Three Month Period Ended
			Exposure		for the Three Month				31-Mar-14
					Period Ended
					31-Mar-14
	(In thousands)
	Financial derivatives–assets
	Credit default swaps on asset-backed securities		Credit		$	1,190			$	(1,210	)
	Credit default swaps on asset-backed indices		Credit		(1,302		)		145
	Credit default swaps on corporate bond indices		Credit		652				(315		)
	Total return swaps		Equity Market		5,925				10
	Interest rate swaps		Interest Rates		1,472				(6,080		)
	Futures		Interest Rates		41				2,435
	Forwards		Currency		10				167
	Other		Credit/		53				288
			Interest Rates
					8,041				(4,560		)
	Financial derivatives–liabilities
	Credit default swaps on asset-backed securities		Credit		(19		)		—
	Credit default swaps on asset-backed indices		Credit		2,603				(1,486		)
	Credit default swaps on corporate bond indices		Credit		(3,804		)		4,571
	Total return swaps		Equity Market		(1,417		)		36
	Interest rate swaps		Interest Rates		(3,765		)		(468		)
	Futures		Interest Rates		128				(139		)
	Forwards		Currency		(492		)		(4		)
	Other		Interest Rates		(57		)		(389		)
					(6,823		)		2,121
	Total				$	1,218			$	(2,439	)
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 three month period ended March 31, 2015 and the year ended December 31, 2014:
	Derivative Type		Three Month				Year Ended December 31, 2014
			Period Ended
			31-Mar-15
			(In thousands)
	Interest rate swaps		$	2,989,926			$	2,227,315
	Credit default swaps		712,197				552,411
	Total return swaps		115,026				55,108
	Futures		1,137,642				738,830
	Options		859,413				926,369
	Forwards		61,478				42,143
	Warrants		1,554				120
Schedule of Credit Derivatives	Written credit derivatives held by the Company at March 31, 2015 and December 31, 2014, are summarized below:
	Credit Derivatives		Amount at				Amount at
			31-Mar-15				31-Dec-14
	(In thousands)
	Fair Value of Written Credit Derivatives, Net		$	41,823			$	27,741
	Fair Value of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1)		$	(3,264	)		$	(3,287	)
	Notional Amount of Written Credit Derivatives (2)		$	(373,535	)		$	(341,014	)
	Notional Amount of Purchased Credit Derivatives Offsetting Written Credit Derivatives with Third Parties (1)		$	49,638			$	54,874
	-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 amount of written credit derivatives involving a particular underlying reference asset or index has been reduced (but not below zero) by the notional amount of any contracts where the Company has purchased credit protection on the same reference asset or index with the same ISDA counterparty.

Borrowings_under_Reverse_Repur1

Borrowings under Reverse Repurchase Agreements (Tables)	3 Months Ended
	Mar. 31, 2015
Borrowings under Reverse Repurchase Agreements [Abstract]
Schedule of Repurchase Agreements [Table Text Block]	The following table details the Company's outstanding borrowings under reverse repurchase agreements by remaining maturity as of March 31, 2015 and December 31, 2014:
	(In thousands)	31-Mar-15					31-Dec-14
				Weighted Average					Weighted Average
	Remaining Maturity	Outstanding		Interest Rate		Remaining Days to Maturity	Outstanding		Interest Rate		Remaining Days to Maturity
		Borrowings					Borrowings
	30 Days or Less	$	503,021	0.41	%	16	$	715,194	0.22	%	14
	31-60 Days	336,857		0.67	%	45	322,874		0.52	%	44
	61-90 Days	281,189		0.52	%	73	289,276		0.52	%	71
	91-120 Days	22,413		0.56	%	105	—		—	%	—
	121-150 Days	—		—	%	—	21,236		2.03	%	139
	151-180 Days	87,741		1.11	%	164	123,484		1.25	%	162
	181-360 Days	23,503		0.47	%	227	47,768		0.85	%	274
	>360 Days	141,388		2.43	%	541	149,601		2.41	%	631
		$	1,396,112	0.75	%	102	$	1,669,433	0.65	%	105

LongTerm_Incentive_Plan_Units_

Long-Term Incentive Plan Units (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Roll-Forward of Company's LTIP Units Outstanding	Detailed below is a roll-forward of the Company's LTIP units outstanding for the three month periods ended March 31, 2015 and 2014:
		Three Month Period Ended			Three Month Period Ended
		31-Mar-15			31-Mar-14
		Manager	Director/	Total	Manager	Director/	Total
			Employee			Employee
	LTIP Units Outstanding (12/31/2014 and 12/31/2013, respectively)	375,000	54,314	429,314	375,000	36,052	411,052
	Granted	—	—	—	—	—	—
	Exercised	—	—	—	—	—	—
	LTIP Units Outstanding (3/31/2015 and 3/31/2014, respectively)	375,000	54,314	429,314	375,000	36,052	411,052
	LTIP Units Vested and Outstanding (3/31/2015 and 3/31/2014, respectively)	375,000	29,859	404,859	375,000	20,314	395,314

Common_Share_Capitalization_Ta

Common Share Capitalization (Tables)	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Note [Abstract]
Summary of Common Shares Outstanding	Detailed below is a roll-forward of the Company's common shares outstanding for the three month periods ended March 31, 2015 and 2014:
		Three Month	Three Month
		Period Ended	Period Ended
		31-Mar-15	31-Mar-14
	Common Shares Outstanding	33,449,678	25,428,186
	(12/31/2014 and 12/31/2013, respectively)
	Share Activity:
	Shares issued in connection with incentive fee payment	—	13,564
	Common Shares Outstanding	33,449,678	25,441,750
	(3/31/2015 and 3/31/2014, respectively)

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Computation Of Basic And Diluted EPS	The components of the computation of basic and diluted EPS were as follows:
			Three Month Period Ended March 31,
			2015			2014
	(In thousands except share amounts)
	Net increase in shareholders' equity resulting from operations		$	19,261		$	22,635
	Add: Net increase in equity resulting from operations attributable to the participating non-controlling interest(1)		120			185
	Net increase in equity resulting from operations related to common shares, LTIP unit holders, and participating non-controlling interest		19,381			22,820
	Net increase in shareholders' equity resulting from operations available to common share and LTIP unit holders:
	Net increase in shareholders' equity resulting from operations– common shares		19,017			22,275
	Net increase in shareholders' equity resulting from operations– LTIP units		244			360
	Dividends Paid(2):
	Common shareholders		(21,743		)	(19,590		)
	LTIP unit holders		(279		)	(317		)
	Non-controlling interest		(137		)	(163		)
	Total dividends paid to common shareholders, LTIP unit holders, and non-controlling interest		(22,159		)	(20,070		)
	Undistributed (Distributed in excess of) earnings:
	Common shareholders		(2,726		)	2,685
	LTIP unit holders		(35		)	43
	Non-controlling interest		(17		)	22
	Total undistributed (distributed in excess of) earnings attributable to common shareholders, LTIP unit holders, and non-controlling interest		$	(2,778	)	$	2,750
	Weighted average shares outstanding (basic and diluted):
	Weighted average common shares outstanding		33,449,678			23,435,571
	Weighted average participating LTIP units		429,314			411,052
	Weighted average non-controlling interest units		212,000			212,000
	Basic earnings per common share:
	Distributed		$	0.65		$	0.77
	Undistributed (Distributed in excess of)		(0.08		)	0.11
			$	0.57		$	0.88
	Diluted earnings per common share:
	Distributed		$	0.65		$	0.77
	Undistributed (Distributed in excess of)		(0.08		)	0.11
			$	0.57		$	0.88
	-1	For the three month periods ended March 31, 2015 and 2014, excludes net increase in equity resulting from operations of $36.0 thousand and $18.0 thousand, respectively attributable to joint venture partners, which have non-participating interests as described in Note 9.
	-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)	3 Months Ended
	Mar. 31, 2015
Risks and Uncertainties [Abstract]
% Of Total Collateral On Reverse Repurchase Agreements	The following table details the percentage of such collateral held by counterparties who hold greater than 15% of the aggregate $1.63 billion in collateral for various reverse repurchase agreements as of March 31, 2015. In addition to the below, unencumbered investments, on a settlement date basis, of approximately $224.8 million were held in custody at the Bank of New York Mellon Corporation.
	Dealer	% of Total
		Collateral on
		Reverse Repurchase
		Agreements
	Royal Bank of Canada	19%
	Deutsche Bank	16%
% 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 March 31, 2015:
	Dealer	% of Total Due
		from Brokers
	Morgan Stanley	24%
	J.P. Morgan Securities Inc.	24%
% 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 March 31, 2015:
	Dealer	% of Total Receivable
		for Securities Sold
	CS First Boston	35%
	Citigroup	20%
Schedule of Cash and Cash Equivalents [Table Text Block]	In addition the Company held cash and cash equivalents of $156.3 million and $114.1 million as of March 31, 2015 and December 31, 2014, respectively. The below table details the concentration of cash and cash equivalents held by each counterparty:
		As of
	Counterparty	March 31, 2015	31-Dec-14
	Bank of New York Mellon Corporation	67%	11%
	BlackRock Liquidity TempFund	32%	88%
	US Bank	1%	1%

Offsetting_of_Assets_and_Liabi1

Offsetting of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014. 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.
	March 31, 2015:
	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		$	89,844		$	(44,608	)	$	—	$	(24,765	)	$	20,471
	Repurchase agreements		44,754			(44,754		)	—		—			—
	Liabilities
	Financial derivatives–liabilities		(67,667		)	44,608			—		18,005			(5,054		)
	Reverse repurchase agreements		(1,396,112		)	44,754			1,337,332		14,026			—
	December 31, 2014:
	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		$	80,029		$	(40,671	)	$	—	$	(5,578	)	$	33,780
	Repurchase agreements		172,001			(172,001		)	—		—			—
	Liabilities
	Financial derivatives–liabilities		(66,116		)	26,758			—		17,393			(21,965		)
	Reverse repurchase agreements		(1,669,433		)	172,001			1,483,187		14,245			—
	-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 March 31, 2015 and December 31, 2014 were $1.63 billion and $1.94 billion, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $17.6 million and $22.7 million, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $40.3 million and $23.2 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)	3 Months Ended
	Mar. 31, 2015
Financial Highlights [Abstract]
Results of Operations For a Share Outstanding	Results of Operations for a Share Outstanding Throughout the Periods:
		Three Month Period Ended			Three Month Period Ended
		31-Mar-15			31-Mar-14
	Beginning Shareholders' Equity Per Share (12/31/2014 and 12/31/2013, respectively)	$	23.38		$	24.4
	Net Investment Income	0.52			0.55
	Net Realized/Unrealized Gains (Losses)	0.06			0.35
	Results of Operations Attributable to Equity	0.58			0.9
	Less: Results of Operations Attributable to Non-controlling Interests	—			(0.01		)
	Results of Operations Attributable to Shareholders' Equity(1)	0.58			0.89
	Dividends Paid to Common Shareholders	(0.65		)	(0.77		)
	Weighted Average Share Impact on Dividends Paid (2)	(0.01		)	(0.02		)
	Accretive (Dilutive) Effect of Share Issuances (Net of Offering Costs), Share Repurchases, and Adjustments to Non-controlling Interest	—			(0.01		)
	Ending Shareholders' Equity Per Share (3/31/2015 and 3/31/2014, respectively)(3)	$	23.3		$	24.49
	Shares Outstanding, end of period	33,449,678			25,441,750
	-1	Calculated based on average common shares outstanding and can differ from the calculation for EPS (See Note 11).
	-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 March 31, 2015 and 2014, shareholders' equity per share would be $23.01 and $24.10, 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)
		Three Month Period Ended		Three Month Period Ended
		31-Mar-15		31-Mar-14
	Total Return	2.47%		3.56%
	-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)
		Three Month Period Ended		Three Month Period Ended
		31-Mar-15		31-Mar-14
	Net Investment Income (2)	8.92%		9.07%
	-1	Average equity is calculated using month end values.
	-2	Includes all items of income and expense on an annualized basis.
Expense Ratios to Average Equity	Expense Ratios to Average Equity: (1)(2)
		Three Month		Three Month
		Period Ended		Period Ended
		31-Mar-15		31-Mar-14
	Operating expenses, before interest expense and other investment related expenses	-2.63%		-2.81%
	Interest expense and other investment related expenses	-2.14%		-1.97%
	Total Expenses	-4.77%		-4.78%
	-1	Average equity is calculated using month end values.
	-2	Includes all items of income and expense on an annualized basis.

Organization_and_Investment_Ob1

Organization and Investment Objective Narrative (Details) (Parent [Member])	Mar. 31, 2015
Parent [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Percentage	99.40%

Significant_Accounting_Policie2

Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
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 $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-	$89,844,000	[1]	$80,029,000	[1]
Fair value repurchase agreements	44,754,000	[1]	172,001,000	[1]
Investments sold short, at fair value-	-1,195,882,000		-1,291,370,000
Financial derivatives–liabilities, at fair value-	-67,667,000	[1]	-66,116,000	[1]
Securitized Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Security Owned and Pledged as Collateral, Fair Value	2,100,000		2,200,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	156,250,000		114,140,000
Total investments and financial derivatives–assets, at fair value and repurchase agreements	1,099,000		261,000
Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value	-425,000		-26,597,000
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-	0		-26,516,000
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
Level 1 [Member] | Investments Sold Short [Member] | Government 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
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-			-26,516,000
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-	-425,000		-81,000
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
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		0
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
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
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
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		0
Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	0		0
Level 1 [Member] | Financial Derivatives - Liabilities [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	0		0
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-	-425,000		-81,000
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
Level 1 [Member] | Securitized Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securitized debt(1)	0	[2]	0	[3]
Level 1 [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	0		0
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
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		0
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
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
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
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
Level 1 [Member] | Investments [Member] | Other asset-backed securities and loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	0		0
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
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
Level 1 [Member] | Investments [Member] | Private Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	0		0
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-	1,099,000		261,000
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
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
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
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
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		0
Level 1 [Member] | Financial Derivatives - Assets [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-	0		0
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-	83,000		0
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-	1,016,000		261,000
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
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		0
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
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0		0
Total investments and financial derivatives–assets, at fair value and repurchase agreements	1,569,906,000		1,785,365,000
Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value	-1,262,578,000		-1,330,650,000
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-	-1,195,882,000		-1,264,854,000
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-	-1,154,779,000		-1,209,539,000
Level 2 [Member] | Investments Sold Short [Member] | Government debt sold short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-	-41,103,000		-55,315,000
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
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-	-66,696,000		-65,796,000
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-	-5,970,000		-4,410,000
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		0
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-	-31,277,000		-28,588,000
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-	-1,139,000		-2,953,000
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-	-25,325,000		-29,405,000
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-	-18,000		-21,000
Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	-1,819,000		-137,000
Level 2 [Member] | Financial Derivatives - Liabilities [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	-431,000		-146,000
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
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-	-717,000		-136,000
Level 2 [Member] | Securitized Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securitized debt(1)	0	[2]	0	[3]
Level 2 [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	1,447,434,000		1,545,083,000
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-	1,142,107,000		1,258,699,000
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-	17,683,000		1,636,000
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-	287,644,000		284,748,000
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-	0		0
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
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
Level 2 [Member] | Investments [Member] | Other asset-backed securities and loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	0		0
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-	0		0
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
Level 2 [Member] | Investments [Member] | Private Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	0		0
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-	77,718,000		68,281,000
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-	2,661,000		1,881,000
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
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-	50,536,000		35,865,000
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-	22,287,000		28,654,000
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-	1,000		8,000
Level 2 [Member] | Financial Derivatives - Assets [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-	2,212,000		344,000
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-	21,000		645,000
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
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-			884,000
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		0
Level 2 [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value repurchase agreements	44,754,000		172,001,000
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0		0
Total investments and financial derivatives–assets, at fair value and repurchase agreements	514,536,000		638,486,000
Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value	-1,215,000		-1,013,000
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
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
Level 3 [Member] | Investments Sold Short [Member] | Government 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
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
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-	-546,000		-239,000
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
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-	-239,000		-239,000
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
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
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
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-	-307,000		0
Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	0		0
Level 3 [Member] | Financial Derivatives - Liabilities [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	0		0
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
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
Level 3 [Member] | Securitized Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securitized debt(1)	-669,000	[2]	-774,000	[3]
Level 3 [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	503,509,000		626,999,000
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-	26,335,000		31,385,000
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		0
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-	169,371,000		274,369,000
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-	52,214,000		53,311,000
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-	38,918,000		28,309,000
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-	30,845,000		27,482,000
Level 3 [Member] | Investments [Member] | Other asset-backed securities and loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	123,620,000		146,288,000
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-	31,836,000		42,708,000
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-	9,070,000		8,635,000
Level 3 [Member] | Investments [Member] | Private Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	21,300,000		14,512,000
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-	11,027,000		11,487,000
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
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-	10,809,000		11,387,000
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
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
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-	118,000		0
Level 3 [Member] | Financial Derivatives - Assets [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-	0		0
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
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
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
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-	100,000		100,000
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
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	156,250,000		114,140,000
Total investments and financial derivatives–assets, at fair value and repurchase agreements	2,085,541,000		2,424,112,000
Total investments sold short, financial derivatives–liabilities, and securitized debt, at fair value	-1,264,218,000		-1,358,260,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments Sold Short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-	-1,195,882,000		-1,291,370,000
Estimate of Fair Value, Fair Value Disclosure [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-	-1,154,779,000		-1,209,539,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments Sold Short [Member] | Government debt sold short [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments sold short, at fair value-	-41,103,000		-55,315,000
Estimate of Fair Value, Fair Value Disclosure [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-			-26,516,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Financial Derivatives - Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	-67,667,000		-66,116,000
Estimate of Fair Value, Fair Value Disclosure [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-	-5,970,000		-4,410,000
Estimate of Fair Value, Fair Value Disclosure [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-	-239,000		-239,000
Estimate of Fair Value, Fair Value Disclosure [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-	-31,277,000		-28,588,000
Estimate of Fair Value, Fair Value Disclosure [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-	-1,139,000		-2,953,000
Estimate of Fair Value, Fair Value Disclosure [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-	-25,325,000		-29,405,000
Estimate of Fair Value, Fair Value Disclosure [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-	-325,000		-21,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Financial Derivatives - Liabilities [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	-1,819,000		-137,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Financial Derivatives - Liabilities [Member] | Options [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–liabilities, at fair value-	-431,000		-146,000
Estimate of Fair Value, Fair Value Disclosure [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-	-425,000		-81,000
Estimate of Fair Value, Fair Value Disclosure [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-	-717,000		-136,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Securitized Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securitized debt(1)	-669,000	[2]	-774,000	[3]
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	1,950,943,000		2,172,082,000
Estimate of Fair Value, Fair Value Disclosure [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-	1,168,442,000		1,290,084,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	17,683,000		1,636,000
Estimate of Fair Value, Fair Value Disclosure [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-	457,015,000		559,117,000
Estimate of Fair Value, Fair Value Disclosure [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-	52,214,000		53,311,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member] | Commercial Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	38,918,000		28,309,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member] | Residential Mortgage Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	30,845,000		27,482,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member] | Other asset-backed securities and loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	123,620,000		146,288,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	31,836,000		42,708,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member] | Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	9,070,000		8,635,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Investments [Member] | Private Corporate Equity Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value-	21,300,000		14,512,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Financial Derivatives - Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-	89,844,000		80,029,000
Estimate of Fair Value, Fair Value Disclosure [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-	2,661,000		1,881,000
Estimate of Fair Value, Fair Value Disclosure [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-	10,809,000		11,387,000
Estimate of Fair Value, Fair Value Disclosure [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-	50,536,000		35,865,000
Estimate of Fair Value, Fair Value Disclosure [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-	22,287,000		28,654,000
Estimate of Fair Value, Fair Value Disclosure [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-	119,000		8,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Financial Derivatives - Assets [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives–assets, at fair value-	2,212,000		344,000
Estimate of Fair Value, Fair Value Disclosure [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-	104,000		645,000
Estimate of Fair Value, Fair Value Disclosure [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-	1,016,000		261,000
Estimate of Fair Value, Fair Value Disclosure [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-			884,000
Estimate of Fair Value, Fair Value Disclosure [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-	100,000		100,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value repurchase agreements	44,754,000		172,001,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Transfers between Level 1 and Level 2	$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]	The asset subject to the resecuritization had a fair value of $2.1 million as of March 31, 2015, which is included on the Consolidated Schedule of Investments under Principal and Interest – Private Label Securities.
[3]	The asset subject to the resecuritization had a fair value of $2.2 million as of December 31, 2014, which is included on the Consolidated Schedule of Investments under Principal and Interest – Private Label Securities.

Valuation_Schedule_Of_Signific

Valuation (Schedule Of Significant Unobservable Inputs, Qualitative Information) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Securitized debt	669,000		774,000
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	514,536,000		638,486,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Corporate Debt and non-exchange traded corporate equity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	28,574,000
Level 3 [Member] | 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	12.4
Level 3 [Member] | 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	107.25
Level 3 [Member] | 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	84.53
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	121,922,000	[1]	201,373,000	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	1.81	[1]	1.83	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	165.5	[1]	119.58	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Residential Mortgage Backed Securities and Securitized Debt [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	70.23	[1]	73.58	[2]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	34,496,000		40,919,000
Level 3 [Member] | 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	5.62		5.62
Level 3 [Member] | 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	103.25		103.25
Level 3 [Member] | 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	63.72		66.56
Level 3 [Member] | Market Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	21,914,000		22,928,000
Level 3 [Member] | 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	3.46		3.62
Level 3 [Member] | 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	24.5		24.86
Level 3 [Member] | 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	10.69		11.38
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	90,593,000		123,029,000
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	23.5		21.5
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	134		137
Level 3 [Member] | Market Approach Valuation Technique [Member] | Other Asset-backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	96.67		94.91
Level 3 [Member] | Market Approach Valuation Technique [Member] | Total Return Swaps [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	-189,000	[3]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Total Return Swaps [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	69.67	[3]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Total Return Swaps [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	99.75	[3]
Level 3 [Member] | Market Approach Valuation Technique [Member] | Total Return Swaps [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation	70.26	[3]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value			45,668,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation			73
Yield			7.50%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation			108
Yield			24.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt, Non-exchange traded corporate equity, and warrants [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Non Binding Third-Party Valuation			95.08
Yield			13.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	8,500,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	15.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	15.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Corporate debt and warrants [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	15.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	46,780,000		72,222,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	6.20%		3.00%
Projected Collateral Prepayments	20.50%		6.70%
Fair Value Inputs Losses	3.70%		0.00%
Fair Value Inputs Projected Collateral Recoveries	0.00%		0.00%
Fair Value Inputs Projected Collateral Scheduled Amortization	0.00%		0.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	18.30%		13.60%
Projected Collateral Prepayments	82.90%		100.00%
Fair Value Inputs Losses	33.30%		44.50%
Fair Value Inputs Projected Collateral Recoveries	23.30%		22.40%
Fair Value Inputs Projected Collateral Scheduled Amortization	57.50%		86.40%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Residential Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	8.90%		7.00%
Projected Collateral Prepayments	49.30%		45.60%
Fair Value Inputs Losses	16.50%		11.30%
Fair Value Inputs Projected Collateral Recoveries	10.40%		8.00%
Fair Value Inputs Projected Collateral Scheduled Amortization	23.80%		35.10%
Total Outstanding Collateral	100.00%		100.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	17,718,000		12,392,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	12.90%		12.00%
Fair Value Inputs Losses	0.00%		0.10%
Fair Value Inputs Projected Collateral Recoveries	0.00%		0.90%
Fair Value Inputs Projected Collateral Scheduled Amortization	0.00%		85.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	49.50%		51.10%
Fair Value Inputs Losses	59.30%		2.50%
Fair Value Inputs Projected Collateral Recoveries	40.70%		13.50%
Fair Value Inputs Projected Collateral Scheduled Amortization	100.00%		99.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Private Label Commercial Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	23.30%		23.70%
Fair Value Inputs Losses	6.60%		0.70%
Fair Value Inputs Projected Collateral Recoveries	10.00%		6.20%
Fair Value Inputs Projected Collateral Scheduled Amortization	83.40%		93.10%
Total Outstanding Collateral	100.00%		100.00%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	29,441,000		21,328,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	9.80%		9.20%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	55.20%		13.10%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Performing Commercial Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	15.80%		10.30%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	9,477,000		6,981,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	9.20%		15.30%
Months to Resolution	4 months 21 days		0 months 15 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	17.40%		20.10%
Months to Resolution	6 months 0 days		10 months 15 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Non-performing Commercial Mortgage Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	13.40%		16.40%
Months to Resolution	5 months 12 days		8 months 6 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Agency Interest Only Residential Mortgage-Backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	4,421,000		8,457,000
Level 3 [Member] | 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	52.60%		50.20%
Fair Value Inputs Projected Collateral Scheduled Amortization	0.00%		0.00%
LIBOR OAS	0.98%	[4]	-1.54%	[4]
Level 3 [Member] | 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%
Fair Value Inputs Projected Collateral Scheduled Amortization	47.40%		49.80%
LIBOR OAS	6.14%	[4]	17.96%	[4]
Level 3 [Member] | 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	84.60%		75.50%
Fair Value Inputs Projected Collateral Scheduled Amortization	15.40%		24.50%
Total Outstanding Collateral	100.00%		100.00%
LIBOR OAS	3.89%	[4]	3.59%	[4]
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	39,915,000		36,117,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	5.70%		6.10%
Months to Resolution	4 months 9 days		4 months 3 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	12.00%		12.00%
Months to Resolution	169 months 27 days		79 months 3 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Residential Mortgage Loans and Real Estate Owned Properties [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	7.00%		7.30%
Months to Resolution	38 months 18 days		24 months 18 days
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other asset-backed securities and loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	33,027,000		23,259,000
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other asset-backed securities and loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	12.00%		0.00%
Projected Collateral Prepayments	0.00%		62.70%
Fair Value Inputs Losses	2.00%		4.00%
Fair Value Inputs Projected Collateral Recoveries	0.00%		1.70%
Fair Value Inputs Projected Collateral Scheduled Amortization	21.90%		31.60%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other asset-backed securities and loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	17.40%		14.40%
Projected Collateral Prepayments	69.50%		62.70%
Fair Value Inputs Losses	18.90%		4.00%
Fair Value Inputs Projected Collateral Recoveries	6.10%		1.70%
Fair Value Inputs Projected Collateral Scheduled Amortization	81.10%		31.60%
Level 3 [Member] | Income Approach Valuation Technique [Member] | Other asset-backed securities and loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	12.70%		9.10%
Projected Collateral Prepayments	34.90%		62.70%
Fair Value Inputs Losses	11.00%		4.00%
Fair Value Inputs Projected Collateral Recoveries	2.60%		1.70%
Fair Value Inputs Projected Collateral Scheduled Amortization	51.50%		31.60%
Total Outstanding Collateral	100.00%		100.00%
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	10,570,000		11,148,000
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	26.40%		17.80%
Fair Value Inputs Losses	16.00%		16.50%
Fair Value Inputs Projected Collateral Recoveries	7.30%		7.70%
Fair Value Inputs Projected Collateral Scheduled Amortization	15.90%		15.90%
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	56.20%		55.80%
Fair Value Inputs Losses	37.00%		37.70%
Fair Value Inputs Projected Collateral Recoveries	18.70%		18.50%
Fair Value Inputs Projected Collateral Scheduled Amortization	31.10%		43.40%
Credit Default Swaps On Asset Backed Securities [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Projected Collateral Prepayments	32.30%		32.50%
Fair Value Inputs Losses	28.70%		29.70%
Fair Value Inputs Projected Collateral Recoveries	12.90%		12.80%
Fair Value Inputs Projected Collateral Scheduled Amortization	26.10%		25.00%
Total Outstanding Collateral	100.00%		100.00%
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	8,171,000		6,241,000
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	10.00%		10.00%
Expected Holding Period (Months)	14 months		17 months
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	10.00%		10.00%
Expected Holding Period (Months)	14 months		17 months
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Level 3 [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	10.00%		10.00%
Expected Holding Period (Months)	14 months		17 months
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred and Common Equity Investment in Mortgage-Related Entities [Member] | Level 3 [Member] | Recent Transactions [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	7,991,000		5,411,000
[1]	Includes securitized debt with a fair value of $0.7 million as of March 31, 2015.
[2]	Includes securitized debt with a fair value of $0.8 million as of December 31, 2014.
[3]	Represents valuations on underlying assets.
[4]	Shown in basis points.

Valuation_Fair_Value_Measureme

Valuation (Fair Value Measurement Using Significant Unobservable Inputs) (Details) (Level 3 [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	$638,486,000	$756,934,000
Assets, Accreted Discounts/Amortized Premiums	-3,573,000	4,023,000
Assets, Realized Gain (Loss)	3,976,000	25,480,000
Assets, Change In Net Unrealized Gain/(Loss)	23,000	-11,972,000
Assets, Purchases	100,888,000	163,958,000
Assets, Sales	-146,400,000	-244,020,000
Assets, Transfers into Level 3	23,221,000	0
Assets, Transfers out of Level 3	-102,085,000	0
Assets, Ending Balance	514,536,000	694,403,000
Liabilities, Begining Balance	-1,013,000	-1,333,000
Liabilities, Accreted Discounts/Amortized Premiums	-2,000	-7,000
Liabilities, Realized Gain/(Loss)	-19,000	-19,000
Liabilities, Change In Net Unrealized Gain/(Loss)	-288,000	-17,000
Liabilities Purchases/Payments	88,000	24,000
Liabilities, Sales/Issuance	19,000	19,000
Liabilities, Transfers into Level 3	0	0
Liabilities, Transfers out of Level 3	0	0
Liabilities, Ending Balance	-1,215,000	-1,333,000
Change in net unrealized gain (loss) on investments	-3,200,000	2,300,000
Change in net unrealized gain (loss) in financial derivative assets	-200,000	-1,200,000
Change in net unrealized Gain (Loss) on financial derivative liabilities	-300,000
Change in net unrealized gain (loss) in securitized debt	19,000	-17,000
Securitized Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	-774,000	-983,000
Liabilities, Accreted Discounts/Amortized Premiums	-2,000	-7,000
Liabilities, Realized Gain/(Loss)	0	0
Liabilities, Change In Net Unrealized Gain/(Loss)	19,000	-17,000
Liabilities, Payments	88,000	24,000
Liabilities, Issuances	0	0
Liabilities, Transfers into Level 3	0	0
Liabilities, Transfers out of Level 3	0	0
Liabilities, Ending Balance	-669,000	-983,000
Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	626,999,000	740,288,000
Assets, Accreted Discounts/Amortized Premiums	-3,573,000	4,023,000
Assets, Realized Gain (Loss)	3,575,000	24,290,000
Assets, Change In Net Unrealized Gain/(Loss)	260,000	-10,762,000
Assets, Purchases	100,866,000	163,919,000
Assets, Sales	-145,754,000	-242,529,000
Assets, Transfers into Level 3	23,221,000	0
Assets, Transfers out of Level 3	-102,085,000	0
Assets, Ending Balance	503,509,000	679,229,000
Investments [Member] | Agency residential mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	31,385,000	40,504,000
Assets, Accreted Discounts/Amortized Premiums	-2,006,000	-2,289,000
Assets, Realized Gain (Loss)	471,000	35,000
Assets, Change In Net Unrealized Gain/(Loss)	-96,000	751,000
Assets, Purchases	1,190,000	2,554,000
Assets, Sales	-4,609,000	-180,000
Assets, Transfers into Level 3	0	0
Assets, Transfers out of Level 3	0	0
Assets, Ending Balance	26,335,000	41,375,000
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	274,369,000	580,772,000
Assets, Accreted Discounts/Amortized Premiums	2,388,000	5,385,000
Assets, Realized Gain (Loss)	1,206,000	23,460,000
Assets, Change In Net Unrealized Gain/(Loss)	3,062,000	-12,852,000
Assets, Purchases	6,633,000	89,585,000
Assets, Sales	-39,423,000	-196,267,000
Assets, Transfers into Level 3	23,221,000	0
Assets, Transfers out of Level 3	-102,085,000	0
Assets, Ending Balance	169,371,000	490,083,000
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	53,311,000	32,994,000
Assets, Accreted Discounts/Amortized Premiums	1,372,000	205,000
Assets, Realized Gain (Loss)	614,000	872,000
Assets, Change In Net Unrealized Gain/(Loss)	-1,900,000	1,515,000
Assets, Purchases	15,594,000	37,769,000
Assets, Sales	-16,777,000	-40,710,000
Assets, Transfers into Level 3	0	0
Assets, Transfers out of Level 3	0	0
Assets, Ending Balance	52,214,000	32,645,000
Investments [Member] | Commercial Mortgage Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	28,309,000	23,887,000
Assets, Accreted Discounts/Amortized Premiums	539,000	563,000
Assets, Realized Gain (Loss)	0	2,000
Assets, Change In Net Unrealized Gain/(Loss)	17,000	-460,000
Assets, Purchases	24,291,000	20,023,000
Assets, Sales	-14,238,000	-10,000
Assets, Transfers into Level 3	0	0
Assets, Transfers out of Level 3	0	0
Assets, Ending Balance	38,918,000	44,005,000
Investments [Member] | Residential Mortgage Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	27,482,000	24,062,000
Assets, Accreted Discounts/Amortized Premiums	443,000	0
Assets, Realized Gain (Loss)	242,000	18,000
Assets, Change In Net Unrealized Gain/(Loss)	144,000	-260,000
Assets, Purchases	5,976,000	0
Assets, Sales	-3,442,000	-254,000
Assets, Transfers into Level 3	0	0
Assets, Transfers out of Level 3	0	0
Assets, Ending Balance	30,845,000	23,566,000
Investments [Member] | Other asset-backed securities and loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	146,288,000
Assets, Accreted Discounts/Amortized Premiums	-6,340,000
Assets, Realized Gain (Loss)	772,000
Assets, Change In Net Unrealized Gain/(Loss)	-1,154,000
Assets, Purchases	26,534,000
Assets, Sales	-42,480,000
Assets, Transfers into Level 3	0
Assets, Transfers out of Level 3	0
Assets, Ending Balance	123,620,000
Investments [Member] | Corporate Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	42,708,000
Assets, Accreted Discounts/Amortized Premiums	31,000
Assets, Realized Gain (Loss)	186,000
Assets, Change In Net Unrealized Gain/(Loss)	-580,000
Assets, Purchases	11,605,000
Assets, Sales	-22,114,000
Assets, Transfers into Level 3	0
Assets, Transfers out of Level 3	0
Assets, Ending Balance	31,836,000
Investments [Member] | Real Estate Owned [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	8,635,000	0
Assets, Accreted Discounts/Amortized Premiums	0	0
Assets, Realized Gain (Loss)	84,000	0
Assets, Change In Net Unrealized Gain/(Loss)	537,000	-4,000
Assets, Purchases	2,471,000	101,000
Assets, Sales	-2,657,000	0
Assets, Transfers into Level 3	0	0
Assets, Transfers out of Level 3	0	0
Assets, Ending Balance	9,070,000	97,000
Investments [Member] | Other Asset-backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance		38,069,000
Assets, Accreted Discounts/Amortized Premiums		159,000
Assets, Realized Gain (Loss)		-97,000
Assets, Change In Net Unrealized Gain/(Loss)		548,000
Assets, Purchases		13,887,000
Assets, Sales		-5,108,000
Assets, Transfers into Level 3		0
Assets, Transfers out of Level 3		0
Assets, Ending Balance		47,458,000
Investments [Member] | Private Corporate Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	14,512,000
Assets, Accreted Discounts/Amortized Premiums	0
Assets, Realized Gain (Loss)	0
Assets, Change In Net Unrealized Gain/(Loss)	230,000
Assets, Purchases	6,572,000
Assets, Sales	-14,000
Assets, Transfers into Level 3	0
Assets, Transfers out of Level 3	0
Assets, Ending Balance	21,300,000
Financial Derivatives - Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	11,487,000	16,646,000
Assets, Accreted Discounts/Amortized Premiums	0	0
Assets, Realized Gain (Loss)	401,000	1,190,000
Assets, Change In Net Unrealized Gain/(Loss)	-237,000	-1,210,000
Assets, Purchases	22,000	39,000
Assets, Sales	-646,000	-1,491,000
Assets, Transfers into Level 3	0	0
Assets, Transfers out of Level 3	0	0
Assets, Ending Balance	11,027,000	15,174,000
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	11,387,000	16,646,000
Assets, Accreted Discounts/Amortized Premiums	0	0
Assets, Realized Gain (Loss)	401,000	1,190,000
Assets, Change In Net Unrealized Gain/(Loss)	-355,000	-1,210,000
Assets, Purchases	22,000	39,000
Assets, Sales	-646,000	-1,491,000
Assets, Transfers into Level 3	0	0
Assets, Transfers out of Level 3	0	0
Assets, Ending Balance	10,809,000	15,174,000
Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	0
Assets, Accreted Discounts/Amortized Premiums	0
Assets, Realized Gain (Loss)	0
Assets, Change In Net Unrealized Gain/(Loss)	118,000
Assets, Purchases	0
Assets, Sales	0
Assets, Transfers into Level 3	0
Assets, Transfers out of Level 3	0
Assets, Ending Balance	118,000
Financial Derivatives - Assets [Member] | Warrant [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Beginning Balance	100,000
Assets, Accreted Discounts/Amortized Premiums	0
Assets, Realized Gain (Loss)	0
Assets, Change In Net Unrealized Gain/(Loss)	0
Assets, Purchases	0
Assets, Sales	0
Assets, Transfers into Level 3	0
Assets, Transfers out of Level 3	0
Assets, Ending Balance	100,000
Financial Derivatives - Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liabilities, Begining Balance	-239,000	-350,000
Liabilities, Accreted Discounts/Amortized Premiums	0	0
Liabilities, Realized Gain/(Loss)	-19,000	-19,000
Liabilities, Change In Net Unrealized Gain/(Loss)	-307,000	0
Liabilities, Purchases	0	0
Liabilities, Sales	19,000	19,000
Liabilities, Transfers into Level 3	0	0
Liabilities, Transfers out of Level 3	0	0
Liabilities, Ending Balance	-546,000	-350,000
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	-239,000	-350,000
Liabilities, Accreted Discounts/Amortized Premiums	0	0
Liabilities, Realized Gain/(Loss)	-19,000	-19,000
Liabilities, Change In Net Unrealized Gain/(Loss)	0	0
Liabilities, Purchases	0	0
Liabilities, Sales	19,000	19,000
Liabilities, Transfers into Level 3	0	0
Liabilities, Transfers out of Level 3	0	0
Liabilities, Ending Balance	-239,000	-350,000
Financial Derivatives - Liabilities [Member] | Total Return Swaps [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)	-307,000
Liabilities, Purchases	0
Liabilities, Sales	0
Liabilities, Transfers into Level 3	0
Liabilities, Transfers out of Level 3	0
Liabilities, Ending Balance	($307,000)

To_Be_Announced_RMBS_Details

To Be Announced RMBS (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
To Be Announced Securities [Line Items]
Fair Value	$1,950,943,000		$2,172,082,000
Receivable for securities sold	1,230,339,000		1,237,592,000
Financial Instruments Sold, Not yet Purchased, at Fair Value	-1,195,882,000		-1,291,370,000
Payable for securities purchased	116,276,000		98,747,000
To Be Announced Fixed Rate Agency Securities [Member]
To Be Announced Securities [Line Items]
Fair Value	27,590,000	[1],[2],[3],[4]	72,410,000	[1],[5],[6],[7]
Investment Owned, Balance, Principal Amount	26,990,000		71,598,000
Receivable for securities sold	1,150,060,000		1,205,779,000
TBA - Fixed Rate Agency Securities Sold Short [Member]
To Be Announced Securities [Line Items]
Financial Instruments Sold, Not yet Purchased, at Fair Value	-1,154,779,000	[1],[3],[8]	-1,209,539,000	[1],[7],[9]
Investment Sold, Not yet Purchased, Balance, Principal Amount	-1,083,180,000		-1,135,218,000
Payable for securities purchased	-29,110,000		-71,832,000
Investment Owned At Fair Value, Net	($1,127,189,000)		($1,137,129,000)
[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 ofEquityUnrated but Agency-Guaranteed 148.77%A/A/A 0.34%Baa/BBB/BBB 3.04%Ba/BB/BB or below 64.24%Unrated 32.00%
[3]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,606,164 $1,823,880 $1,881,365 239.53 %Europe 56,061 57,497 48,278 6.15 %North America (Private Corporate Equity Investments) n/a 21,274 21,300 2.71 %Total $1,902,651 $1,950,943 248.39 %Investments Sold Short: North America (TBAs and Government Debt) (1,103,716) $(1,170,994) $(1,175,699) (149.69)%Europe (Government Debt) (19,039) (22,575) (20,183) (2.57)%Total $(1,122,755) $(1,193,569) $(1,195,882) (152.26)%Repurchase Agreements: North America 24,046 $24,046 $24,046 3.06 %Europe 20,709 21,027 20,708 2.64 %Total 44,755 $45,073 $44,754 5.70 %Financial Derivatives–Assets: North America 1,650,257 $45,179 $58,131 7.40 %Europe 159,342 33,420 31,713 4.04 %Total 1,809,599 $78,599 $89,844 11.44 %Financial Derivatives–Liabilities: North America (2,731,689) $(26,330) $(55,961) (7.13)%Europe (115,111) (10,854) (11,706) (1.49)%Total (2,846,800) $(37,184) $(67,667) (8.62)%
[4]	At March 31, 2015, 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 83.65%, 53.13%, and 11.99% of equity, respectively.
[5]	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 163.60%A/A/A 0.98%Baa/BBB/BBB 5.62%Ba/BB/BB or below 80.65%Unrated 24.61%
[6]	At December 31, 2014, 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 100.30%, 53.97%, and 9.33% of equity, respectively.
[7]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Properties/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,863,057 $2,038,249 $2,092,959 264.46 %Europe 69,724 69,360 64,611 9.16 %North America (Private Corporate Equity Investments) n/a 14,717 14,512 1.84 %Total $2,122,326 $2,172,082 275.46 %Investments Sold Short: North America (TBAs and Government Debt) (1,159,703) $(1,230,478) $(1,234,248) (156.53)%Europe (Government Debt) (28,118) (32,008) (30,606) (3.88)%North America (Common Stock) (2,986) (27,605) (26,516) (3.36)%Total $(1,290,091) $(1,291,370) (163.77)%Repurchase Agreements: North America 140,248 $140,248 $140,248 17.78 %Europe 31,753 31,753 31,753 4.03 %Total 172,001 $172,001 $172,001 21.81 %Financial Derivatives–Assets: North America 1,401,261 $61,560 $80,029 10.15 %Europe — — — — %Total 1,401,261 $61,560 $80,029 10.15 %Financial Derivatives–Liabilities: North America (936,799) $(30,598) $(63,084) (8.00)%Europe (37,199) (2,957) (3,032) (0.39)%Total (973,998) $(33,555) $(66,116) (8.39)%
[8]	At March 31, 2015, the Company's short investments guaranteed by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation represented 117.75% and 29.28% of equity, respectively.
[9]	At December 31, 2014, the Company's short investments guaranteed by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation, represented 121.95% and 31.44% of equity, respectively.

Financial_Derivatives_Schedule

Financial Derivatives (Schedule Of Gains And Losses On Derivative Contracts) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives	($38)		$1,218
Unrealized Gain (Loss) on Financial Derivatives			-2,439
Foreign currency translation	-5,063		-65	[1]
Unrealized Gain (Loss) on Derivatives, including Foreign Currency Translation Gain (Loss)	-5,148	[2]
Financial Derivatives - Assets [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives	25,306		8,041
Unrealized Gain (Loss) on Financial Derivatives	-7,156	[2]	-4,560
Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Derivative [Line Items]
Primary risk exposure	Credit		Credit
Net Realized Gain/Loss on Financial Derivatives	401		1,190
Unrealized Gain (Loss) on Financial Derivatives	-355	[2]	-1,210
Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Derivative [Line Items]
Primary risk exposure	Credit		Credit
Net Realized Gain/Loss on Financial Derivatives	226		-1,302
Unrealized Gain (Loss) on Financial Derivatives	-1,252	[2]	145
Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Derivative [Line Items]
Primary risk exposure	Credit		Credit
Net Realized Gain/Loss on Financial Derivatives	-3,014		652
Unrealized Gain (Loss) on Financial Derivatives	828	[2]	-315
Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Derivative [Line Items]
Primary risk exposure	Equity Market/Credit		Equity Market
Net Realized Gain/Loss on Financial Derivatives	1,810		5,925
Unrealized Gain (Loss) on Financial Derivatives	110	[2]	10
Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Primary risk exposure	Interest Rates		Interest Rates
Net Realized Gain/Loss on Financial Derivatives	19,460		1,472
Unrealized Gain (Loss) on Financial Derivatives	-6,987	[2]	-6,080
Financial Derivatives - Assets [Member] | Futures [Member]
Derivative [Line Items]
Primary risk exposure	Interest Rates		Interest Rates
Net Realized Gain/Loss on Financial Derivatives	2,398		41
Unrealized Gain (Loss) on Financial Derivatives	824	[2]	2,435
Financial Derivatives - Assets [Member] | Forwards [Member]
Derivative [Line Items]
Primary risk exposure	Currency		Currency
Net Realized Gain/Loss on Financial Derivatives	7,285		10
Unrealized Gain (Loss) on Financial Derivatives	-884	[2]	167
Financial Derivatives - Assets [Member] | Other Derivatives [Member]
Derivative [Line Items]
Primary risk exposure	Credit/ Interest Rates		Credit/ Interest Rates
Net Realized Gain/Loss on Financial Derivatives	-3,260		53
Unrealized Gain (Loss) on Financial Derivatives	560	[2]	288
Financial Derivatives - Liabilities [Member]
Derivative [Line Items]
Net Realized Gain/Loss on Financial Derivatives	-25,344		-6,823
Unrealized Gain (Loss) on Financial Derivatives	2,008	[2]	2,121
Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member]
Derivative [Line Items]
Primary risk exposure	Credit		Credit
Net Realized Gain/Loss on Financial Derivatives	-19		-19
Unrealized Gain (Loss) on Financial Derivatives	0	[2]	0
Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Derivative [Line Items]
Primary risk exposure	Credit		Credit
Net Realized Gain/Loss on Financial Derivatives	145		2,603
Unrealized Gain (Loss) on Financial Derivatives	206	[2]	-1,486
Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Derivative [Line Items]
Primary risk exposure	Credit		Credit
Net Realized Gain/Loss on Financial Derivatives	2,124		-3,804
Unrealized Gain (Loss) on Financial Derivatives	-2,656	[2]	4,571
Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member]
Derivative [Line Items]
Primary risk exposure	Credit
Net Realized Gain/Loss on Financial Derivatives	-668
Unrealized Gain (Loss) on Financial Derivatives	485	[2]
Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Derivative [Line Items]
Primary risk exposure	Equity Market/Credit		Equity Market
Net Realized Gain/Loss on Financial Derivatives	-458		-1,417
Unrealized Gain (Loss) on Financial Derivatives	-304	[2]	36
Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Primary risk exposure	Interest Rates		Interest Rates
Net Realized Gain/Loss on Financial Derivatives	-25,197		-3,765
Unrealized Gain (Loss) on Financial Derivatives	4,321	[2]	-468
Financial Derivatives - Liabilities [Member] | Futures [Member]
Derivative [Line Items]
Primary risk exposure	Interest Rates/Equity Market		Interest Rates
Net Realized Gain/Loss on Financial Derivatives	-32		128
Unrealized Gain (Loss) on Financial Derivatives	-411	[2]	-139
Financial Derivatives - Liabilities [Member] | Forwards [Member]
Derivative [Line Items]
Primary risk exposure	Currency		Currency
Net Realized Gain/Loss on Financial Derivatives	-1,489		-492
Unrealized Gain (Loss) on Financial Derivatives	-581	[2]	-4
Financial Derivatives - Liabilities [Member] | Other Derivatives [Member]
Derivative [Line Items]
Primary risk exposure	Credit/ Interest Rates		Interest Rates
Net Realized Gain/Loss on Financial Derivatives	250		-57
Unrealized Gain (Loss) on Financial Derivatives	948	[2]	-389
Derivative [Member]
Derivative [Line Items]
Foreign currency translation	$1,000
[1]	Conformed to current period presentation.
[2]	Includes foreign currency translation on derivatives in the amount of $1.0 million which is shown on the Consolidated Statement of Operations in Change in net unrealized gain (loss) on foreign currency translation.

Financial_Derivatives_Financia

Financial Derivatives Financial Derivatives (Schedule of Derivative Activity) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Interest Rate Swaps [Member]
Derivative [Line Items]
Average Monthly Notional Amount	$2,989,926	$2,227,315
Credit Default Swap [Member]
Derivative [Line Items]
Average Monthly Notional Amount	712,197	552,411
Total Return Swaps [Member]
Derivative [Line Items]
Average Monthly Notional Amount	115,026	55,108
Futures [Member]
Derivative [Line Items]
Average Monthly Notional Amount	1,137,642	738,830
Option contract [Member]
Derivative [Line Items]
Average Monthly Notional Amount	859,413	926,369
Forwards [Member]
Derivative [Line Items]
Average Monthly Notional Amount	61,478	42,143
Warrant [Member]
Derivative [Line Items]
Average Monthly Notional Amount	$1,554	$120

Financial_Derivatives_Schedule1

Financial Derivatives (Schedule Of Credit Derivatives) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Credit Default Swap, Selling Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net	$41,823		$27,741
Notional value	-373,535	[1]	-341,014	[1]
Credit Default Swap, Buying Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net	-3,264	[2]	-3,287	[2]
Notional value	$49,638	[2]	$54,874	[2]
[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 amount of written credit derivatives involving a particular underlying reference asset or index has been reduced (but not below zero) by the notional amount 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 $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Low Range Of Spread On Written Credit Derivatives	0.15%	0.15%
High Range Of Spread On Written Credit Derivatives	5.00%	5.00%
Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Total net up-front payments received	$41.10	$28.90

Schedule_of_Reverse_Repurchase

Schedule of Reverse Repurchase Agreements by Maturity (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	$1,396,112	[1]	$1,669,433	[1]
Debt, Weighted Average Interest Rate	0.75%		0.65%
Remaining Days to Maturity, Reverse Repurchase Agreements	102 days		105 days
Maturity up to 30 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	503,021		715,194
Debt, Weighted Average Interest Rate	0.41%		0.22%
Remaining Days to Maturity, Reverse Repurchase Agreements	16 days		14 days
Maturity 31 to 60 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	336,857		322,874
Debt, Weighted Average Interest Rate	0.67%		0.52%
Remaining Days to Maturity, Reverse Repurchase Agreements	45 days		44 days
Maturity 61 to 90 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	281,189		289,276
Debt, Weighted Average Interest Rate	0.52%		0.52%
Remaining Days to Maturity, Reverse Repurchase Agreements	73 days		71 days
Maturity 91 to 120 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	22,413		0
Debt, Weighted Average Interest Rate	0.56%		0.00%
Remaining Days to Maturity, Reverse Repurchase Agreements	105 days		0 days
Maturity 121 to 150 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	0		21,236
Debt, Weighted Average Interest Rate	0.00%		2.03%
Remaining Days to Maturity, Reverse Repurchase Agreements	0 days		139 days
Maturity 151 to 180 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	87,741		123,484
Debt, Weighted Average Interest Rate	1.11%		1.25%
Remaining Days to Maturity, Reverse Repurchase Agreements	164 days		162 days
Maturity 181 to 360 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	23,503		47,768
Debt, Weighted Average Interest Rate	0.47%		0.85%
Remaining Days to Maturity, Reverse Repurchase Agreements	227 days		274 days
Maturity greater than 360 days [Member]
Reverse Repurchase Agreements [Line Items]
Reverse repurchase agreements	$141,388		$149,601
Debt, Weighted Average Interest Rate	2.43%		2.41%
Remaining Days to Maturity, Reverse Repurchase Agreements	541 days		631 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_under_Repurchase_Ag

Borrowings under Repurchase Agreements (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Reverse Repurchase Agreements [Line Items]
Non Mark-to-Market Reverse Repurchase Agreement Facility	150,000,000
Initial Period of Non-Mark-to-Market Financing Facility	18 months
Cancellation Notice Period Under Non-Mark-to-Market Financing Facility	6 months
Number of Counterparties with Outstanding Reverse Repurchase Agreements	16		16
Concentration Risk, Reverse Repurchase Agreements	37.00%		23.00%
Number Counterparties With Concentration Risk, Reverse Repurchase Agreements	2		1
Forward Starting Reverse Repurchase Agreements	13,900,000		50,100,000
Investments held with dealers as collateral	1,620,000,000		1,930,000,000
Pledged Financial Instruments, Not Separately Reported, Securities For Repurchase Agreements Unsettled	35,900,000		145,500,000
Minimum [Member]
Reverse Repurchase Agreements [Line Items]
Reverse Repurchase Agreements Maturity	30 days
Financing term under non-mark-to-market facility	2 years
Reverse Repurchase Agreements Remaining Terms	1 day		2 days
Reverse Repurchase Agreements Interest Rate	-0.22%		-1.50%
Maximum [Member]
Reverse Repurchase Agreements [Line Items]
Reverse Repurchase Agreements Maturity	180 days
Reverse Repurchase Agreements Remaining Terms	541 days		631 days
Reverse Repurchase Agreements Interest Rate	2.43%		2.42%
Reverse Repurchase Agreements [Member]
Reverse Repurchase Agreements [Line Items]
Cash Collateral (Received) Pledged	14,026,000	[1],[2]	14,245,000	[1],[2]
Security Owned and Pledged as Collateral, Fair Value	2,500,000		12,500,000
[1]	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 March 31, 2015 and December 31, 2014 were $1.63 billion and $1.94 billion, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $17.6 million and $22.7 million, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $40.3 million and $23.2 million, respectively.
[2]	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.

Base_Management_Fee_And_Incent1

Base Management Fee And Incentive Fee (Details) (USD $)	3 Months Ended			12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014		Dec. 31, 2014
Base Management Fee And Incentive Fee [Abstract]
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.
Management Fee Expense	$2,952	$2,364	[1]
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 March 31, 2015 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.
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%
[1]	Conformed to current period presentation.

LongTerm_Incentive_Plan_Units_1

Long-Term Incentive Plan Units (Narrative) (Details) (USD $)	3 Months Ended			4 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014		Dec. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$98	$63	[1]
Manager [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP units granted				375,000
[1]	Conformed to current period presentation.

LongTerm_Incentive_Plan_Units_2

Long-Term Incentive Plan Units (Roll-Forward Of Company's LTIP Units Outstanding) (Details) (Long-Term Incentive Plan Units [Member])	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding	429,314	411,052
Granted	0	0
Exercised	0	0
LTIP Units Outstanding	429,314	411,052
LTIP Units Vested and Outstanding	404,859	395,314
Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding	375,000	375,000
Granted	0	0
Exercised	0	0
LTIP Units Outstanding	375,000	375,000
LTIP Units Vested and Outstanding	375,000	375,000
Non-Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding	54,314	36,052
Granted	0	0
Exercised	0	0
LTIP Units Outstanding	54,314	36,052
LTIP Units Vested and Outstanding	29,859	20,314

Noncontrolling_Interests_Detai

Non-controlling Interests (Details) (USD $)	0 Months Ended	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Jan. 02, 2013	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest		5,933	$6,389
Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest		5,933	6,389	7,073	5,648
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, Ownership Percentage by Noncontrolling Owners		0.60%
Non-controlling interest of joint venture partner [Member] | Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		5.00%
Stockholders' Equity Attributable to Noncontrolling Interest		1,100

Common_Share_Capitalization_Na

Common Share Capitalization (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		44 Months Ended
	Aug. 04, 2011	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015
Common Stock Capitalization [Line Items]
Dividends (in usd per share)		$0.65	$0.77
Payments of Dividends		($22,159,000)	($20,070,000)
Aggregate cost of shares repurchase	10,000,000
Shares repurchased				-217,619
Aggregate cost of shares repurchased				$4,500,000
Average price per share repurchased (in usd per share)				$20.59
Common Shares Issued And Outstanding Upon Conversion of All Convertible Securities		34,090,992	26,064,802	34,090,992

Common_Share_Capitalization_Su

Common Share Capitalization (Summary Of Common Shares Outstanding) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Shares Outstanding, period begin	33,449,678	25,428,186
Shares issued in connection with incentive fee payment	0	13,564
Common Shares Outstanding, period end	33,449,678	25,441,750

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Net increase (decrease) in shareholders' equity resulting from operations
Net Income (Loss) Attributable to Parent	$19,261		$22,635	[1]
Net Income (Loss) Attributable to Participating Non-controlling Interest	120	[2]	185	[2]
Net income (loss) attributable to parent and participating non-controlling interest	19,381		22,820
Net increase in shareholders' equity resulting from operations– common shares	19,017		22,275
Net increase in shareholders' equity resulting from operations– LTIP units	244		360
Dividends Paid(2):
Common shareholders	-21,743	[3]	-19,590	[3]
LTIP unit holders	-279	[3]	-317	[3]
Non-controlling Interest	-137	[3]	-163	[3]
Total dividends paid to common shareholders, LTIP unit holders, and non-controlling interest	-22,159	[3],[4]	-20,070	[3],[4]
Undistributed (Distributed in excess of) earnings:
Common shareholders	-2,726		2,685
LTIP Unit holders	-35		43
Non-controlling interest	-17		22
Total undistributed (distributed in excess of) earnings attributable to common shareholders, LTIP unit holders, and non-controlling interest	-2,778		2,750
Weighted average shares outstanding (basic and diluted):
Weighted average common shares outstanding	33,449,678		23,435,571
Weighted average participating LTIP units	429,314		411,052
Weighted average non-controlling interest units	212,000		212,000
Basic earnings per common share:
Distributed (in usd per share)	$0.65		$0.77
Undistributed (Distributed in excess of) (in usd per share)	($0.08)		$0.11
Basic earnings per common share (in usd per share)	$0.57		$0.88
Diluted earnings per common share:
Distributed (in usd per share)	$0.65		$0.77
Undistributed (Distributed in excess of) (in usd per share)	($0.08)		$0.11
Diluted earnings per common share (in usd per share)	$0.57		$0.88
Net Income (Loss) Attributable to Non-Participating Non-controlling Interest	$36		$18
[1]	Conformed to current period presentation.
[2]	For the three month periods ended March 31, 2015 and 2014, excludes net increase in equity resulting from operations of $36.0 thousand and $18.0 thousand, respectively attributable to joint venture partners, which have non-participating interests as described in Note 9.
[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.
[4]	For the three month periods ended March 31, 2015 and 2014, dividends totaling $0.65 and $0.77, respectively, per common share and convertible unit outstanding, were declared and paid.

Counterparty_Risk_Narrative_De

Counterparty Risk (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Risks and Uncertainties [Abstract]
Collateral Pledged on Reverse Repurchase Agreements Segregated under Securities Exchange Commission Regulation	$1,630,000,000
Pledged Financial Instruments, Not Separately Reported, Securities For Repurchase Agreements Unsettled	35,900,000	145,500,000
Unencumbered investments held in custody	224,800,000
Cash and Cash Equivalents, at Carrying Value	$156,250,000	$114,140,000	$170,362,000	$183,489,000
Concentration risk threshold	15.00%

Counterparty_Risk_Of_Total_Col

Counterparty Risk (% Of Total Collateral On Reverse Repurchase Agreements) (Details)	Mar. 31, 2015
Deutsche Bank [Member]
Concentration Risk [Line Items]
% of Total Collateral on Reverse Repurchase Agreements	16.00%
Royal Bank of Canada [Member]
Concentration Risk [Line Items]
% of Total Collateral on Reverse Repurchase Agreements	19.00%

Counterparty_Risk_Of_Due_from_

Counterparty Risk (% Of Due from Brokers) (Details)	Mar. 31, 2015
Morgan Stanley [Member]
Concentration Risk [Line Items]
% of Total Due from Brokers	24.00%
JP Morgan Securities Inc [Member]
Concentration Risk [Line Items]
% of Total Due from Brokers	24.00%

Counterparty_Risk_Of_Total_Rec

Counterparty Risk (% Of Total Receivable For Securities Sold) (Details)	Mar. 31, 2015
CS First Boston [Member]
Concentration Risk [Line Items]
% of Total Receivable for Securities Sold	35.00%
Citigroup [Member]
Concentration Risk [Line Items]
% of Total Receivable for Securities Sold	20.00%

Counterparty_Risk_Cash_and_Cas

Counterparty Risk (Cash and Cash Equivalents) (Details)	Mar. 31, 2015	Dec. 31, 2014
BlackRock Liquidity Temp Fund [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	32.00%	88.00%
Bank of New York Mellon Corporation [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	67.00%	11.00%
US Bank [Member]
Concentration Risk [Line Items]
Concentration risk percentage, cash and cash equivalents	1.00%	1.00%

Offsetting_of_Assets_and_Liabi2

Offsetting of Assets and Liabilities (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value-	$89,844,000	[1]	$80,029,000	[1]
Fair value repurchase agreements	44,754,000	[1]	172,001,000	[1]
Financial derivatives–liabilities, at fair value-	-67,667,000	[1]	-66,116,000	[1]
Reverse Repurchase Agreements	-1,396,112,000	[1]	-1,669,433,000	[1]
Derivative Liability Instruments available for offset	-44,608,000		-40,671,000
Reverse Repurchase Agreements Available for Offset	-44,754,000		-172,001,000
Derivative Asset Instruments available for offset	44,608,000		26,758,000
Repurchase Agreements Available for Offset	44,754,000		172,001,000
Repurchase Agreements and Related Collateral Net	0		0
Reverse Repurchase Agreements and Related Collateral Net	0		0
Securities Collateral realting to Repurchase and Reverse Repurchase Agreements	1,630,000,000		1,940,000,000
Financial Derivatives - Assets [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value-	89,844,000	[2],[3]	80,029,000	[2],[4]
Financial Instruments Pledged as Collateral	0	[5],[6]	0	[5],[6]
Cash Collateral (Received) Pledged	-24,765,000	[5],[6]	-5,578,000	[5],[6]
Derivatives and Related Collateral Net	20,471,000		33,780,000
Excess cash collateral	17,600,000		22,700,000
Securities Purchased under Agreements to Resell [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	0	[5],[6]	0	[5],[6]
Cash Collateral (Received) Pledged	0	[5],[6]	0	[5],[6]
Reverse Repurchase Agreements [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	1,337,332,000	[5],[6]	1,483,187,000	[5],[6]
Cash Collateral (Received) Pledged	14,026,000	[5],[6]	14,245,000	[5],[6]
Financial Derivatives - Liabilities [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–liabilities, at fair value-	-67,667,000	[2],[3]	-66,116,000	[2],[4]
Financial Instruments Pledged as Collateral	0	[5],[6]	0	[5],[6]
Cash Collateral (Received) Pledged	18,005,000	[5],[6]	17,393,000	[5],[6]
Derivatives and Related Collateral Net	-5,054,000		-21,965,000
Excess cash collateral	$40,300,000		$23,200,000
[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]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,606,164 $1,823,880 $1,881,365 239.53 %Europe 56,061 57,497 48,278 6.15 %North America (Private Corporate Equity Investments) n/a 21,274 21,300 2.71 %Total $1,902,651 $1,950,943 248.39 %Investments Sold Short: North America (TBAs and Government Debt) (1,103,716) $(1,170,994) $(1,175,699) (149.69)%Europe (Government Debt) (19,039) (22,575) (20,183) (2.57)%Total $(1,122,755) $(1,193,569) $(1,195,882) (152.26)%Repurchase Agreements: North America 24,046 $24,046 $24,046 3.06 %Europe 20,709 21,027 20,708 2.64 %Total 44,755 $45,073 $44,754 5.70 %Financial Derivatives–Assets: North America 1,650,257 $45,179 $58,131 7.40 %Europe 159,342 33,420 31,713 4.04 %Total 1,809,599 $78,599 $89,844 11.44 %Financial Derivatives–Liabilities: North America (2,731,689) $(26,330) $(55,961) (7.13)%Europe (115,111) (10,854) (11,706) (1.49)%Total (2,846,800) $(37,184) $(67,667) (8.62)%
[4]	The following table details the breakout by geographical region of long investments, investments sold short, repurchase agreements, financial derivatives–assets, and financial derivatives–liabilities.Region Current Principal/Notional Value/Number of Properties/Number of Shares Cost/(Proceeds) Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,863,057 $2,038,249 $2,092,959 264.46 %Europe 69,724 69,360 64,611 9.16 %North America (Private Corporate Equity Investments) n/a 14,717 14,512 1.84 %Total $2,122,326 $2,172,082 275.46 %Investments Sold Short: North America (TBAs and Government Debt) (1,159,703) $(1,230,478) $(1,234,248) (156.53)%Europe (Government Debt) (28,118) (32,008) (30,606) (3.88)%North America (Common Stock) (2,986) (27,605) (26,516) (3.36)%Total $(1,290,091) $(1,291,370) (163.77)%Repurchase Agreements: North America 140,248 $140,248 $140,248 17.78 %Europe 31,753 31,753 31,753 4.03 %Total 172,001 $172,001 $172,001 21.81 %Financial Derivatives–Assets: North America 1,401,261 $61,560 $80,029 10.15 %Europe — — — — %Total 1,401,261 $61,560 $80,029 10.15 %Financial Derivatives–Liabilities: North America (936,799) $(30,598) $(63,084) (8.00)%Europe (37,199) (2,957) (3,032) (0.39)%Total (973,998) $(33,555) $(66,116) (8.39)%
[5]	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 March 31, 2015 and December 31, 2014 were $1.63 billion and $1.94 billion, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $17.6 million and $22.7 million, respectively. As of March 31, 2015 and December 31, 2014, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $40.3 million and $23.2 million, respectively.
[6]	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.

Contingencies_And_Commitments_

Contingencies And Commitments Contingencies and Commitments (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Consumer Loan [Member]
Other Commitments [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	$46.30
Debt and equity investments in mortgage originators [Member]
Other Commitments [Line Items]
Number of Investments	3
Corporate Debt [Member]
Other Commitments [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	4
Corporate Debt [Member] | Due on or before December 31, 2015 [Member]
Other Commitments [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	2
Corporate Debt [Member] | Due on or before June 12, 2016 [Member]
Other Commitments [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	2
Non-Exchange Traded Equity Investment in Mortgage Originator
Other Commitments [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	200
Guaranty Liabilities	$2.50

Financial_Highlights_Narrative

Financial Highlights (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financial Highlights [Abstract]
TotalLTIPandOPUnitsOutstanding	641,314	623,052
Percentage Of Long Term Incentive Plan Units and Operating Partnership Units On Total Shares And Units	1.88%	2.39%
Total Return After Incentive Fees Assuming Conversion Of All LTIP Units at Time of Issuance	2.51%	3.69%
Market based total return	2.96%	8.44%

Financial_Highlights_Results_O

Financial Highlights (Results Of Operations For A Share Outstanding) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) Equity Per Share [Roll Forward]
Beginning Shareholders' Equity Per Share (12/31/2014 and 12/31/2013, respectively)	$23.38		$24.40
Net Investment Income	$0.52		$0.55
Net Realized/Unrealized Gains (Losses)	$0.06		$0.35
Results of Operations Attributable to Equity	$0.58		$0.90
Less: Results of Operations Attributable to Non-controlling Interests	$0		($0.01)
Results of Operations Attributable to Shareholders' Equity	$0.58	[1]	$0.89	[1]
Dividends Paid Per Common Share	($0.65)		($0.77)
Weighted Average Share Impact on Dividends Paid (2)	($0.01)	[2]	($0.02)	[2]
Accretive (Dilutive) Effect of Share Issuances (Net of Offering Costs), Share Repurchases, and Adjustments to Non-controlling Interest	$0		($0.01)
Ending Shareholders' Equity Per Share (3/31/2015 and 3/31/2014, respectively)(3)	$23.30	[3]	$24.49	[3]
Shares Outstanding, end of period	33,449,678		25,441,750		33,449,678	25,428,186
Shareholders Equity Per Share Upon Conversion Of All Convertible Units (in usd per share)	$23.01		$24.10
[1]	Calculated based on average common shares outstanding and can differ from the calculation for EPS (See Note 11).
[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 March 31, 2015 and 2014, shareholders' equity per share would be $23.01 and $24.10, respectively.

Financial_Highlights_Net_Asset

Financial Highlights (Net Asset Value Based Total Return For A Shareholder) (Details)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Financial Highlights [Abstract]
Total Return	2.47%	[1]	3.56%	[1]
[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)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Financial Highlights [Abstract]
Net Investment Income	8.92%	[1],[2]	9.07%	[1],[2]
[1]	Includes all items of income and expense on an annualized basis.
[2]	Average equity is calculated using month end values.

Financial_Highlights_Expense_R

Financial Highlights (Expense Ratios To Average Equity) (Details)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Financial Highlights [Abstract]
Operating expenses, before interest expense and other investment related expenses	-2.63%	[1],[2]	-2.81%	[1],[2]
Interest expense and other investment related expenses	-2.14%	[1],[2]	-1.97%	[1],[2]
Total Expenses	-4.77%	[1],[2]	-4.78%	[1],[2]
[1]	Includes all items of income and expense on an annualized basis.
[2]	Average equity is calculated using month end values.

Subsequent_Events_Details

Subsequent Events (Details) (Subsequent Event [Member], USD $)	0 Months Ended
	4-May-15
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend Per Share	$0.65
Declared date	4-May-15
Payment Date	15-Jun-15
Record Date	1-Jun-15