CYS Investments 10-K 14 Feb 14 2013 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Jan. 31, 2014	Jun. 30, 2013
Document Information [Line Items]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Period Focus	'FY	'	'
Document Fiscal Year Focus	'2013	'	'
Entity Registrant Name	'CYS Investments, Inc.	'	'
Entity Central Index Key	'0001396446	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Public Float	'	'	$1,577,930,088
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	161,665,360	'

Statements_Of_Assets_And_Liabi

Statements Of Assets And Liabilities (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
ASSETS:	'	'
Investments in securities, at fair value (including pledged assets of $11,835,975 and $14,831,648, respectively)	$13,865,793	$20,861,718
Derivative assets, at fair value	295,707	124,169
Cash and cash equivalents	4,992	13,882
Receivable for securities sold and principal repayments	429,233	10,343
Interest receivable	36,731	46,558
Other assets	608	826
Total assets	14,633,064	21,057,496
LIABILITIES:	'	'
Repurchase agreements	11,206,950	13,981,307
Derivative liabilities, at fair value	29,458	98,575
Payable for securities purchased	1,556,821	4,515,501
Payable for cash received as collateral	37,938	28,910
Distribution payable	4,410	1,243
Accrued interest payable (including accrued interest on repurchase agreements of $7,204 and $11,717, respectively)	24,613	28,863
Accrued expenses and other liabilities	4,218	435
Total liabilities	12,864,408	18,654,834
Commitments and contingencies (note 11)	0	0
NET ASSETS	1,768,656	2,402,662
Net assets consist of:	'	'
7.75% Series A Cumulative Redeemable Preferred Stock, (3,000 and 3,000 shares issued and outstanding, respectively, liquidation preference of $25.00 per share or $75,000 and $75,000 in aggregate, respectively)	72,369	72,369
7.50% Series B Cumulative Redeemable Preferred Stock, (8,000 and 0 shares issued and outstanding, respectively, liquidation preference of $25.00 per share or $200,000 and $0 in aggregate, respectively)	193,531	0
Common Stock, $0.01 par value, 500,000 shares authorized (161,650 and 174,924 shares issued and outstanding, respectively)	1,616	1,749
Additional paid in capital	2,046,530	2,237,512
Retained earnings (accumulated deficit)	-545,390	91,032
NET ASSETS	$1,768,656	$2,402,662
NET ASSET VALUE PER COMMON SHARE	$9.24	$13.31

Statements_Of_Assets_And_Liabi1

Statements Of Assets And Liabilities (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Investments in securities, pledged assets	$11,835,975	$14,831,648
Accrued interest payable, accrued interest on repurchase agreements	7,204	11,717
Series A Cumulative Redeemable Preferred Stock, shares authorized	50,000,000	50,000,000
Series A Cumulative Redeemable Preferred Stock, shares issued	3,000,000	3,000,000
Series A Cumulative Redeemable Preferred Stock, shares outstanding	3,000,000	3,000,000
Series A Cumulative Redeemable Preferred Stock, aggregate liquidation value	75,000	75,000
Preferred Stock, Liquidation Preference Per Share	$25	$25
Series B Cumulative Redeemable Preferred Stock, shares issued	8,000,000	0
Series B Cumulative Redeemable Preferred Stock, shares outstanding	8,000,000	0
Series B Cumulative Redeemable Preferred Stock, aggregate liquidation value	$200,000	$0
Series B Cumulative Redeemable Preferred Stock, liquidation preference per share	$25	$25
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	161,650,114	174,924,149
Common Stock, Shares, Outstanding	161,650,114	174,924,149

Schedules_Of_Investments

Schedules Of Investments (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Investment Holdings [Line Items]	'		'
Accretion (Amortization) of Discounts and Premiums, Investments	$115,413,000		$111,647,000
Fair Value	13,865,793,000		20,861,718,000
Fixed Income Securities [Member]	'		'
Investment Holdings [Line Items]	'		'
Percent of Investments in Securities	784.00%		868.30%	[1]
Mortgage Pass Through Agency Residential Mortgage Backed Securities [Member]	'		'
Investment Holdings [Line Items]	'		'
Percent of Investments in Securities	783.60%		865.90%	[1]
Cost	13,923,271,000		20,560,760,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		20,804,143,000
Debt Instrument, Face Amount	13,574,797,000		19,681,502,000
U.S. Treasury Bills [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		37,999,000
Debt Instrument, Face Amount	'		38,000,000
Percent of Investments in Securities	'		1.60%	[1]
Cost	'		37,995,000
Other Investments [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	6,945,000	[2]	19,576,000	[2]
Debt Instrument, Face Amount	6,945,000	[2]	20,473,000	[2]
Percent of Investments in Securities	0.04%		0.80%	[1],[2]
Cost	6,945,000		12,855,000	[1],[2]
Investments In Securities [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	13,865,793,000		20,861,718,000
Debt Instrument, Face Amount	13,581,742,000		19,739,975,000
Cost	13,930,216,000		20,611,610,000
Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	3,900,000,000		3,400,000,000
Fair Value	234,703,000		122,989,000
Percent of Investments in Securities	13.30%		5.10%	[1]
Cost	137,117,000		134,815,000
Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	6,300,000,000		7,490,000,000
Fair Value	31,546,000		-97,395,000
Percent of Investments in Securities	1.80%		-4.10%	[1],[3]
Cost	0		0
Fannie Mae Pools [Member] | Mortgage Pass Through Agency Residential Mortgage Backed Securities [Member]	'		'
Investment Holdings [Line Items]	'		'
Percent of Investments in Securities	679.50%		822.80%	[1]
Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	12,017,766,000		19,768,633,000
Debt Instrument, Face Amount	11,764,435,000		18,695,972,000
Freddie Mac Pools [Member]	'		'
Investment Holdings [Line Items]	'		'
Percent of Investments in Securities	90.20%		38.00%	[1]
Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	1,595,167,000		913,223,000
Debt Instrument, Face Amount	1,572,743,000		871,029,000
Ginnie Mae Pools [Member]	'		'
Investment Holdings [Line Items]	'		'
Percent of Investments in Securities	13.90%		5.10%	[1]
Ginnie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	245,915,000		122,287,000
Debt Instrument, Face Amount	237,619,000		114,501,000
2.14%, due 2/1/2043 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	87,892,000	[4],[5]	'
Debt Instrument, Face Amount	87,600,000	[4],[5]	'
2.15%, due 10/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	40,356,000	[4],[5]	'
Debt Instrument, Face Amount	40,103,000	[4],[5]	'
2.18%, due 11/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	29,160,000	[4],[5]	36,246,000	[6]
Debt Instrument, Face Amount	29,015,000	[4],[5]	34,926,000	[6]
2.25%, due 10/1/2042 - 11/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	85,399,000	[4],[5]	'
Debt Instrument, Face Amount	84,755,000	[4],[5]	'
2.33%, due 11/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	64,029,000	[4],[5]	'
Debt Instrument, Face Amount	63,251,000	[4],[5]	'
2.36%, due 1/1/2043 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	84,181,000	[4],[5]	'
Debt Instrument, Face Amount	83,235,000	[4],[5]	'
2.40%, due 9/1/2042 - 10/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	51,974,000	[4],[5]	'
Debt Instrument, Face Amount	51,272,000	[4],[5]	'
2.41%, due 11/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	63,235,000	[4],[5]	'
Debt Instrument, Face Amount	62,378,000	[4],[5]	'
2.42%, due 9/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	19,677,000	[4],[5]	'
Debt Instrument, Face Amount	19,388,000	[4],[5]	'
2.43%, due 7/1/2042 - 1/1/2043 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	219,176,000	[4],[5]	'
Debt Instrument, Face Amount	215,819,000	[4],[5]	'
2.44%, due 6/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	46,050,000	[4],[5]	'
Debt Instrument, Face Amount	45,301,000	[4],[5]	'
2.50%, due 10/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	77,442,000	[4],[5]	'
Debt Instrument, Face Amount	76,110,000	[4],[5]	'
2.52%, due 10/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	46,099,000	[4],[5]	'
Debt Instrument, Face Amount	45,306,000	[4],[5]	'
2.57%, due 8/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	30,079,000	[4],[5]	'
Debt Instrument, Face Amount	29,496,000	[4],[5]	'
2.60%, due 4/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	31,707,000	[4],[5]	'
Debt Instrument, Face Amount	31,018,000	[4],[5]	'
2.70%, due 6/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	57,043,000	[4],[5]	70,933,000	[6],[7]
Debt Instrument, Face Amount	55,666,000	[4],[5]	67,729,000	[6],[7]
2.78%, due 4/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	137,323,000	[4],[5]	'
Debt Instrument, Face Amount	133,381,000	[4],[5]	'
2.80%, due 2/1/2042 - 4/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	87,096,000	[4],[5]	'
Debt Instrument, Face Amount	84,553,000	[4],[5]	'
2.81%, due 2/1/2042 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	26,361,000	[4],[5]	58,090,000	[6],[7]
Debt Instrument, Face Amount	25,550,000	[4],[5]	55,367,000	[6],[7]
2.84%, due 12/1/2041 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	45,398,000	[4],[5]	'
Debt Instrument, Face Amount	43,963,000	[4],[5]	'
3.00%, due 2/1/2027 - 2/1/2029 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	4,943,083,000	[4]	'
Debt Instrument, Face Amount	4,839,617,000	[4]	'
3.00%, due 12/1/2037 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	48,558,000	[4]	'
Debt Instrument, Face Amount	51,087,000	[4]	'
3.00%, due 10/1/2042 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	39,556,000	[4]	47,556,000	[7]
Debt Instrument, Face Amount	42,107,000	[4]	46,277,000	[7]
3.05%, due 9/1/2041 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	28,987,000	[4],[5]	38,205,000	[6],[7]
Debt Instrument, Face Amount	28,001,000	[4],[5]	36,363,000	[6],[7]
3.24%, due 3/1/2041 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	11,969,000	[4],[5]	16,389,000	[6],[7]
Debt Instrument, Face Amount	11,485,000	[4],[5]	15,547,000	[6],[7]
3.37%, due 5/1/2041 - 8/1/2041 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	36,423,000	[4],[5]	'
Debt Instrument, Face Amount	34,796,000	[4],[5]	'
3.50%, due 12/1/2025 - 1/1/2029 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	992,515,000	[4]	'
Debt Instrument, Face Amount	948,463,000	[4]	'
3.50%, due 6/1/2042 - 9/1/2043 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	1,862,400,000	[4]	'
Debt Instrument, Face Amount	1,872,351,000	[4]	'
3.97%, due 9/1/2039 (a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	7,842,000	[4]	'
Debt Instrument, Face Amount	7,363,000	[4]	'
4.00%, due 1/1/2026 - 4/1/2026 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	243,561,000	[4]	'
Debt Instrument, Face Amount	229,778,000	[4]	'
4.00%, due 7/1/2043 - 2/1/2044 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	2,169,411,000	[4]	'
Debt Instrument, Face Amount	2,106,542,000	[4]	'
4.50%, due 4/1/2030 - 11/1/2030 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	90,796,000	[4]	'
Debt Instrument, Face Amount	84,730,000	[4]	'
4.50%, due 11/1/2041 (a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	212,988,000	[4]	'
Debt Instrument, Face Amount	200,955,000	[4]	'
2.20%, due 2/1/2043 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	28,175,000	[4],[5]	'
Debt Instrument, Face Amount	28,154,000	[4],[5]	'
2.22%, due 12/1/2042 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	42,887,000	[4],[5]	52,100,000	[6]
Debt Instrument, Face Amount	42,719,000	[4],[5]	50,184,000	[6]
2.30%, due 11/1/2042 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	89,526,000	[4],[5]	103,022,000	[6],[7]
Debt Instrument, Face Amount	88,989,000	[4],[5]	99,093,000	[6],[7]
2.43%, due 6/1/2042 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	35,224,000	[4],[5]	40,336,000	[6],[7]
Debt Instrument, Face Amount	34,581,000	[4],[5]	38,618,000	[6],[7]
2.44%, due 4/1/2043 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	29,220,000	[4],[5]	'
Debt Instrument, Face Amount	29,699,000	[4],[5]	'
2.46%, due 7/1/2042 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	39,771,000	[4],[5]	'
Debt Instrument, Face Amount	39,112,000	[4],[5]	'
2.52%, due 11/1/2042 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	37,560,000	[4],[5]	'
Debt Instrument, Face Amount	36,896,000	[4],[5]	'
2.54%, due 7/1/2042 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	34,563,000	[4],[5]	43,077,000	[6],[7]
Debt Instrument, Face Amount	33,904,000	[4],[5]	41,200,000	[6],[7]
2.55%, due 2/1/2043 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	110,650,000	[4],[5]	'
Debt Instrument, Face Amount	111,565,000	[4],[5]	'
2.59%, due 3/1/2042 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	30,638,000	[4],[5]	37,203,000	[6],[7]
Debt Instrument, Face Amount	29,871,000	[4],[5]	35,421,000	[6],[7]
2.79%, due 12/1/2041 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	33,276,000	[4],[5]	44,357,000	[6],[7]
Debt Instrument, Face Amount	32,352,000	[4],[5]	42,260,000	[6],[7]
3.31%, due 1/1/2041 (a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	28,537,000	[4],[5]	'
Debt Instrument, Face Amount	27,151,000	[4],[5]	'
3.50%, due 4/1/2026 - 2/1/2027 (a) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	135,772,000	[4]	'
Debt Instrument, Face Amount	130,144,000	[4]	'
3.50%, due 5/1/2043 - 7/1/2043 (a) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	425,633,000	[4]	'
Debt Instrument, Face Amount	428,429,000	[4]	'
4.00%, due 8/1/2043 - 2/1/2044 (a) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	455,999,000	[4]	'
Debt Instrument, Face Amount	443,680,000	[4]	'
4.50%, due 12/1/2024 - 5/1/2025 (a) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	37,736,000	[4]	'
Debt Instrument, Face Amount	35,497,000	[4]	'
3.00%, due 10/20/2028 (a) | Ginnie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	158,293,000	[4]	'
Debt Instrument, Face Amount	154,038,000	[4]	'
3.50%, due 7/20/2040 (a)(b) | Ginnie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	78,517,000	[4],[5]	'
Debt Instrument, Face Amount	74,931,000	[4],[5]	'
4.00%, due 1/20/2040 (a)(b) | Ginnie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	9,105,000	[4],[5]	13,818,000	[6],[7]
Debt Instrument, Face Amount	8,650,000	[4],[5]	12,875,000	[6],[7]
10/15/2015 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	300,000,000		300,000,000
Fair Value	164,000		386,000
Derivative, Cap Interest Rate	1.43%		1.43%
11/8/2015 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	200,000,000		200,000,000
Fair Value	145,000		302,000
Derivative, Cap Interest Rate	1.36%		1.36%
5/23/2019 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	300,000,000		300,000,000
Fair Value	12,853,000		6,714,000
Derivative, Cap Interest Rate	2.00%		2.00%
6/1/2019 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	300,000,000		300,000,000
Fair Value	14,679,000		7,553,000
Derivative, Cap Interest Rate	1.75%		1.75%
6/29/2019 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	300,000,000		300,000,000
Fair Value	16,539,000		8,686,000
Derivative, Cap Interest Rate	1.50%		1.50%
7/2/2019 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	300,000,000		300,000,000
Fair Value	16,970,000		9,165,000
Derivative, Cap Interest Rate	1.50%		1.50%
7/16/2019 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		500,000,000
Fair Value	31,335,000		17,255,000
Derivative, Cap Interest Rate	1.25%		1.25%
3/26/2020 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		'
Fair Value	41,322,000		'
Derivative, Cap Interest Rate	1.25%		'
3/30/2020 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	700,000,000		'
Fair Value	57,785,000		'
Derivative, Cap Interest Rate	1.25%		'
5/20/2020 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		'
Fair Value	42,911,000		'
Derivative, Cap Interest Rate	1.25%		'
2/14/2015 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		500,000,000
Fair Value	-10,255,000		-18,564,000
Derivative, Fixed Interest Rate	2.15%		2.15%
6/2/2016 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	300,000,000		300,000,000
Fair Value	-9,526,000		-14,320,000
Derivative, Fixed Interest Rate	1.94%		1.94%
12/19/2016 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	250,000,000		250,000,000
Fair Value	-4,255,000		-7,996,000
Derivative, Fixed Interest Rate	1.43%		1.43%
4/24/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		500,000,000	[8]
Fair Value	-4,982,000		-11,556,000	[8]
Derivative, Fixed Interest Rate	1.31%		1.31%	[8]
7/13/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	750,000,000		750,000,000
Fair Value	6,583,000		-4,117,000
Derivative, Fixed Interest Rate	0.86%		0.86%
9/6/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	250,000,000		250,000,000
Fair Value	3,755,000		33,000
Derivative, Fixed Interest Rate	0.77%		0.77%
9/6/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		'
Fair Value	7,407,000		'
Derivative, Fixed Interest Rate	0.77%		'
9/6/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	250,000,000		'
Fair Value	3,804,000		'
Derivative, Fixed Interest Rate	0.77%		'
11/7/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		'
Fair Value	3,240,000		'
Derivative, Fixed Interest Rate	1.11%		'
11/29/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		500,000,000	[9]
Fair Value	8,136,000		1,121,000	[9]
Derivative, Fixed Interest Rate	0.87%		0.87%	[9]
2/21/2018 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		'
Fair Value	7,948,000		'
Derivative, Fixed Interest Rate	1.02%		'
2/27/2018 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		'
Fair Value	9,226,000		'
Derivative, Fixed Interest Rate	0.96%		'
4/25/2018(f) | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000	[10]	'
Fair Value	10,905,000	[10]	'
Derivative, Fixed Interest Rate	1.01%	[10]	'
8/15/2018 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	500,000,000		'
Fair Value	-440,000		'
Derivative, Fixed Interest Rate	1.65%		'
2.15%, due 2/1/2043(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		103,991,000	[6]
Debt Instrument, Face Amount	'		100,000,000	[6]
2.16%, due 10/1/2042(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		46,452,000	[6]
Debt Instrument, Face Amount	'		44,800,000	[6]
2.17%, due 3/1/2043(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		31,167,000	[6]
Debt Instrument, Face Amount	'		30,000,000	[6]
2.24%, due 10/1/2042(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		51,511,000	[6]
Debt Instrument, Face Amount	'		49,605,000	[6]
2.26%, due 11/1/2042(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		47,149,000	[6]
Debt Instrument, Face Amount	'		45,372,000	[6]
2.34%, due 11/1/2042(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		78,162,000	[6]
Debt Instrument, Face Amount	'		75,085,000	[6]
2.38%, due 1/1/2043(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		104,444,000	[6],[7]
Debt Instrument, Face Amount	'		100,237,000	[6],[7]
2.40%, due 9/1/2042 - 10/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		65,915,000	[6],[7]
Debt Instrument, Face Amount	'		63,216,000	[6],[7]
2.41%, due 7/1/2042 - 9/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		72,585,000	[6],[7]
Debt Instrument, Face Amount	'		69,629,000	[6],[7]
2.42%, due 11/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		78,710,000	[6],[7]
Debt Instrument, Face Amount	'		75,395,000	[6],[7]
2.43%, due 2/1/2043(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		26,174,000	[6]
Debt Instrument, Face Amount	'		25,000,000	[6]
2.44%, due 7/1/2042 - 10/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		251,833,000	[6],[7]
Debt Instrument, Face Amount	'		241,204,000	[6],[7]
2.45%, due 10/1/2042 - 11/1/2042(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		90,808,000	[6]
Debt Instrument, Face Amount	'		87,021,000	[6]
2.46%, due 6/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		60,021,000	[6],[7]
Debt Instrument, Face Amount	'		57,508,000	[6],[7]
2.50%, due 2/1/2028 - 3/1/2028 | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		1,985,203,000
Debt Instrument, Face Amount	'		1,900,000,000
2.51%, due 10/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		153,519,000	[6],[7]
Debt Instrument, Face Amount	'		146,723,000	[6],[7]
2.57%, due 7/1/2042 - 2/1/2043(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		136,513,000	[6],[7]
Debt Instrument, Face Amount	'		130,372,000	[6],[7]
2.58%, due 8/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		35,801,000	[6],[7]
Debt Instrument, Face Amount	'		34,217,000	[6],[7]
2.60%, due 2/1/2043(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		52,406,000	[6]
Debt Instrument, Face Amount	'		50,000,000	[6]
2.62%, due 7/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		48,256,000	[6],[7]
Debt Instrument, Face Amount	'		46,138,000	[6],[7]
2.63%, due 4/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		37,264,000	[6],[7]
Debt Instrument, Face Amount	'		35,609,000	[6],[7]
2.79%, due 1/1/2042 - 3/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		89,912,000	[6],[7]
Debt Instrument, Face Amount	'		85,732,000	[6],[7]
2.80%, due 2/1/2042 - 11/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		366,718,000	[6],[7]
Debt Instrument, Face Amount	'		349,671,000	[6],[7]
2.84%, due 2/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		34,247,000	[6],[7]
Debt Instrument, Face Amount	'		32,607,000	[6],[7]
2.85%, due 12/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		55,952,000	[6],[7]
Debt Instrument, Face Amount	'		53,238,000	[6],[7]
2.87%, due 1/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		63,234,000	[6],[7]
Debt Instrument, Face Amount	'		59,639,000	[6],[7]
2.89%, due 2/1/2042(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		42,409,000	[6],[7]
Debt Instrument, Face Amount	'		40,377,000	[6],[7]
3.00%, due 1/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		31,002,000	[6],[7]
Debt Instrument, Face Amount	'		29,557,000	[6],[7]
3.00%, due 2/1/2027 - 12/1/2027(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		7,183,772,000	[7]
Debt Instrument, Face Amount	'		6,794,861,000	[7]
3.00%, due 2/1/2032 - 2/1/2033(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		1,018,411,000	[7]
Debt Instrument, Face Amount	'		967,503,000	[7]
3.02%, due 12/1/2040(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		106,680,000	[6],[7]
Debt Instrument, Face Amount	'		101,591,000	[6],[7]
3.04%, due 9/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		40,639,000	[6],[7]
Debt Instrument, Face Amount	'		38,752,000	[6],[7]
3.06%, due 6/1/2042(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		40,031,000	[6]
Debt Instrument, Face Amount	'		37,791,000	[6]
3.16%, due 9/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		33,343,000	[6],[7]
Debt Instrument, Face Amount	'		31,611,000	[6],[7]
3.18%, due 11/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		29,179,000	[6],[7]
Debt Instrument, Face Amount	'		27,672,000	[6],[7]
3.21%, due 9/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		88,670,000	[6],[7]
Debt Instrument, Face Amount	'		84,111,000	[6],[7]
3.26%, due 4/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		40,970,000	[6],[7]
Debt Instrument, Face Amount	'		38,941,000	[6],[7]
3.30%, due 5/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		33,499,000	[6],[7]
Debt Instrument, Face Amount	'		31,843,000	[6],[7]
3.35%, due 8/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		28,827,000	[6],[7]
Debt Instrument, Face Amount	'		27,024,000	[6],[7]
3.36%, due 6/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		86,263,000	[6],[7]
Debt Instrument, Face Amount	'		81,763,000	[6],[7]
3.38%, due 5/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		18,822,000	[6],[7]
Debt Instrument, Face Amount	'		17,894,000	[6],[7]
3.50%, due 7/1/2021(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		219,747,000	[7]
Debt Instrument, Face Amount	'		207,091,000	[7]
3.50%, due 12/1/2025 - 2/1/2028(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		1,572,774,000	[7]
Debt Instrument, Face Amount	'		1,481,478,000	[7]
3.50%, due 8/1/2042 - 3/1/2043(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		3,425,338,000	[7]
Debt Instrument, Face Amount	'		3,209,041,000	[7]
3.61%, due 6/1/2041(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		52,170,000	[6],[7]
Debt Instrument, Face Amount	'		49,197,000	[6],[7]
3.65%, due 7/1/2040(a)(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		30,810,000	[6],[7]
Debt Instrument, Face Amount	'		29,174,000	[6],[7]
3.99%, due 9/1/2039(b) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		12,432,000	[6]
Debt Instrument, Face Amount	'		11,717,000	[6]
4.00%, due 1/1/2025 - 6/1/2026(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		657,599,000	[7]
Debt Instrument, Face Amount	'		613,772,000	[7]
4.00%, due 8/1/2042(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		114,664,000	[7]
Debt Instrument, Face Amount	'		106,594,000	[7]
4.50%, due 2/1/2028 - 11/1/2030(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		147,730,000	[7]
Debt Instrument, Face Amount	'		136,333,000	[7]
4.50%, due 11/1/2041(a) | Fannie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		277,486,000	[7]
Debt Instrument, Face Amount	'		256,057,000	[7]
2.45%, due 7/1/2042(a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		49,027,000	[6],[7]
Debt Instrument, Face Amount	'		46,980,000	[6],[7]
2.52%, due 9/1/2042(a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		128,547,000	[6],[7]
Debt Instrument, Face Amount	'		122,825,000	[6],[7]
2.55%, due 11/1/2042(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		56,826,000	[6]
Debt Instrument, Face Amount	'		54,278,000	[6]
3.27%, due 6/1/2041(a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		33,995,000	[6],[7]
Debt Instrument, Face Amount	'		32,330,000	[6],[7]
3.30%, due 1/1/2041(a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		37,608,000	[6],[7]
Debt Instrument, Face Amount	'		35,460,000	[6],[7]
3.50%, due 4/1/2026 - 2/1/2027(a) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		197,014,000	[7]
Debt Instrument, Face Amount	'		187,349,000	[7]
3.63%, due 6/1/2041(a)(b) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		34,105,000	[6],[7]
Debt Instrument, Face Amount	'		32,394,000	[6],[7]
4.50%, due 12/1/2024 - 5/1/2025(a) | Freddie Mac Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		56,006,000	[7]
Debt Instrument, Face Amount	'		52,637,000	[7]
3.50%, due 7/20/2040(a)(b) | Ginnie Mae Pools [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		108,469,000	[6],[7]
Debt Instrument, Face Amount	'		101,626,000	[6],[7]
0.06%, due 2/7/2013(a)(d) | U.S. Treasury Bills [Member]	'		'
Investment Holdings [Line Items]	'		'
Fair Value	'		37,999,000	[11],[7]
Debt Instrument, Face Amount	'		38,000,000	[11],[7]
12/30/2014 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		200,000,000
Fair Value	'		38,000
Derivative, Cap Interest Rate	'		2.07%
7/16/2022 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		500,000,000
Fair Value	'		36,010,000
Derivative, Cap Interest Rate	'		1.75%
7/25/2022 | Interest Rate Cap Contracts [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		500,000,000
Fair Value	'		36,880,000
Derivative, Cap Interest Rate	'		1.75%
5/26/2013 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		100,000,000
Fair Value	'		-529,000
Derivative, Fixed Interest Rate	'		1.60%
6/28/2013 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		300,000,000
Fair Value	'		-1,574,000
Derivative, Fixed Interest Rate	'		1.38%
7/15/2013 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		300,000,000
Fair Value	'		-1,706,000
Derivative, Fixed Interest Rate	'		1.37%
12/15/2013 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		400,000,000
Fair Value	'		-3,773,000
Derivative, Fixed Interest Rate	'		1.31%
12/16/2013 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		400,000,000
Fair Value	'		-3,602,000
Derivative, Fixed Interest Rate	'		1.26%
12/16/2013 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		500,000,000
Fair Value	'		-4,581,000
Derivative, Fixed Interest Rate	'		1.28%
12/17/2013 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		400,000,000
Fair Value	'		-3,838,000
Derivative, Fixed Interest Rate	'		1.32%
7/1/2014 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		100,000,000
Fair Value	'		-2,049,000
Derivative, Fixed Interest Rate	'		1.72%
7/16/2014 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		250,000,000
Fair Value	'		-5,309,000
Derivative, Fixed Interest Rate	'		1.73%
8/16/2014 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		200,000,000
Fair Value	'		-3,246,000
Derivative, Fixed Interest Rate	'		1.35%
9/23/2014 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		500,000,000
Fair Value	'		-8,167,000
Derivative, Fixed Interest Rate	'		1.31%
10/6/2014 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		240,000,000
Fair Value	'		-3,405,000
Derivative, Fixed Interest Rate	'		1.17%
9/6/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		250,000,000
Fair Value	'		26,000
Derivative, Fixed Interest Rate	'		0.77%
9/6/2017 | Interest Rate Swap [Member]	'		'
Investment Holdings [Line Items]	'		'
Derivative, Notional Amount	'		500,000,000
Fair Value	'		($243,000)
Derivative, Fixed Interest Rate	'		0.77%
[1]	Percentage of net assets.
[2]	Comprised of investments that were individually less than 1% of net assets.
[3]	The Companybs interest rate swap contracts receive a floating rate set quarterly to three month LIBOR.
[4]	Securities or a portion of the securities are pledged as collateral for repurchase agreements or interest rate swap contracts or forward settling transactions.
[5]	The coupon rate shown on floating or adjustable rate securities represents the rate at DecemberB 31, 2013.
[6]	The coupon rate shown on floating or adjustable rate securities represents the rate at DecemberB 31, 2012.
[7]	Securities or a portion of the securities are pledged as collateral for repurchase agreements, interest rate swap contracts or forward settling transactions.
[8]	The interest rate swap effective date is AprilB 24, 2013 and does not accrue any income or expense until that date.
[9]	The interest rate swap effective date is November 29, 2013 and does not accrue any income or expense until that date.
[10]	The interest rate swap effective date is April 25, 2014, and it does not accrue any income or expense until that date.
[11]	Zero coupon bond, rate shown represents purchase yield.

Statements_Of_Operations

Statements Of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
INVESTMENT INCOME:	'		'		'
Interest income from Agency RMBS	$330,430		$288,960		$228,768
Other income	1,601		4,366		4,129
Total investment income	332,031		293,326		232,897
EXPENSES:	'		'		'
Interest	52,763		44,117		18,789
Management fees	0		0		8,442
Compensation and benefits	12,599		12,264		7,837
General, administrative and other	8,436		8,261		6,910
Total expenses	73,798		64,642		41,978
Net investment income	258,233		228,684		190,919
GAINS AND (LOSSES) FROM INVESTMENTS:	'		'		'
Net realized gain (loss) on investments	-595,116		203,846		35,756
Net unrealized appreciation (depreciation) on investments	-314,530		23,023		225,660
Net gain (loss) from investments	-909,646		226,869		261,416
GAINS AND (LOSSES) FROM SWAP AND CAP CONTRACTS:	'		'		'
Net swap and cap interest income (expense)	-93,497		-60,776		-55,487
Net gain (loss) on termination of swap and cap contracts	30,775		0		-4,903
Net unrealized appreciation (depreciation) on swap and cap contracts	238,353		-21,990		-100,012
Net gain (loss) from swap and cap contracts	175,631	[1]	-82,766	[1]	-160,402	[1]
NET INCOME (LOSS)	-475,782		372,787		291,933
DIVIDENDS ON PREFERRED SHARES	-15,854		-2,405		0
NET INCOME (LOSS) AVAILABLE TO COMMON SHARES	($491,636)		$370,382		$291,933
NET INCOME (LOSS) PER COMMON SHARE BASIC & DILUTED	($2.90)		$2.64		$3.66
[1]	See Note 2 for additional information on the Companybs purpose for entering into interest rate swaps and caps and the decision not to designate them as hedging instruments.

Statement_Of_Changes_In_Net_As

Statement Of Changes In Net Assets (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net income (loss):	'		'		'
Net investment income	$258,233		$228,684		$190,919
Net realized gain (loss) on investments	-595,116		203,846		35,756
Net unrealized appreciation (depreciation) on investments	-314,530		23,023		225,660
Net gain (loss) from swap and cap contracts	175,631	[1]	-82,766	[1]	-160,402	[1]
NET INCOME (LOSS)	-475,782		372,787		291,933
DIVIDENDS ON PREFERRED SHARES	-15,854		-2,405		0
Net income (loss) available to common shares	-491,636		370,382		291,933
Capital transactions:	'		'		'
Net proceeds from issuance of common stock	-552		1,236,807		275,898
Net payments from repurchase of common stock	-115,735		0		0
Net proceeds from issuance of preferred stock	193,531		72,369		0
Distributions on common shares	-146,466		-357,188		-162,455
Tax return of capital distributions	-76,619		0		-23,520
Amortization of share based compensation	3,471		2,834		5,263
Increase (decrease) in net assets from capital transactions	-142,370		954,822		95,186
Total (decrease) increase in net assets	-634,006		1,325,204		387,119
Net assets:	'		'		'
Beginning of period	2,402,662		1,077,458		'
End of period	$1,768,656		$2,402,662		$1,077,458
[1]	See Note 2 for additional information on the Companybs purpose for entering into interest rate swaps and caps and the decision not to designate them as hedging instruments.

Statements_Of_Cash_Flows

Statements Of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'	'
Net income (loss)	($475,782)	$372,787	$291,933
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'
Purchase of investment securities	-44,752,803	-33,654,947	-7,093,540
Premium paid on interest rate caps	-91,860	-133,483	0
Proceeds from disposition of investment securities	48,296,551	19,484,757	2,769,867
Proceeds from paydowns of investment securities	2,427,118	2,889,821	1,406,114
Proceeds from termination of interest rate cap contracts	103,275	0	0
Amortization of share based compensation	3,471	2,834	5,263
Amortization of premiums and discounts on investment securities	115,413	111,647	43,895
Amortization of premiums on interest rate cap contracts	24,240	12,390	3,838
Net realized (gain) loss on investments	595,116	-203,846	-35,756
Net (gain) loss on termination of cap contracts	-37,957	0	0
Net unrealized (appreciation) depreciation on investments	314,530	-23,023	-225,660
Net unrealized (appreciation) depreciation on swap and cap contracts	-238,353	21,990	100,012
Change in assets and liabilities:	'	'	'
Receivable for securities sold and principal repayments	-418,890	-4,793	-5,550
Interest receivable	9,827	-18,743	-11,632
Other assets	218	264	-661
Payable for securities purchased	-2,958,680	4,052,199	-1,771,099
Accrued interest payable	-4,250	13,246	6,205
Related party management fee payable	0	0	-800
Accrued expenses and other liabilities	3,783	-955	675
Payable for cash received as collateral	9,028	28,910	0
Net cash provided by (used in) operating activities	2,923,995	-7,048,945	-4,516,896
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'	'
Proceeds from repurchase agreements	115,545,756	79,752,751	43,998,829
Repayments of repurchase agreements	-118,320,113	-73,652,258	-39,561,858
Net proceeds from issuance of common stock	-552	1,236,807	275,884
Net payments from repurchase of common stock	-115,735	0	0
Net proceeds from issuance of preferred stock	193,531	72,369	0
Distributions paid	-235,772	-358,350	-185,961
Net cash provided by (used in) financing activities	-2,932,885	7,051,319	4,526,894
Net increase (decrease) in cash and cash equivalents	-8,890	2,374	9,998
CASH AND CASH EQUIVALENTS - Beginning of period	13,882	11,508	1,510
CASH AND CASH EQUIVALENTS - End of period	4,992	13,882	11,508
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:	'	'	'
Interest paid	135,920	92,322	70,691
SUPPLEMENTAL DISCLOSURES OF NONCASH FLOW INFORMATION:	'	'	'
Distributions declared, not yet paid	4,410	1,243	0
Reinvestment of distributions on common shares	$0	$1,294	($14)

Organization

Organization	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization	'
	ORGANIZATION
	CYS Investments, Inc. (the “Company”) was formed as a Maryland corporation on January 3, 2006, and commenced operations on February 10, 2006. The Company has elected to be taxed and intends to continue to qualify as a real estate investment trust (“REIT”) and is required to comply with the provisions of the Internal Revenue Code of 1986, as amended (the “Code”), with respect thereto. Since March 2008, the Company has primarily purchased residential mortgage-backed securities that are issued and the principal and interest of which are guaranteed by a federally chartered corporation (“Agency RMBS”), such as the Federal National Mortgage Association (“Fannie Mae”) or the Federal Home Loan Mortgage Corporation (“Freddie Mac”), or an agency of the U.S. government such as the Government National Mortgage Association (“Ginnie Mae”), or debt securities issued by the United States Department of Treasury ("U.S. Treasury Securities"). On December 10, 2012 the Company's board of directors amended and restated its investment guidelines to permit the company to invest in (i) Agency RMBS, (ii) collateralized mortgage obligations issued by a government agency or government-sponsored entity that are collateralized by Agency RMBS and (iii) U.S. Treasury Securities or, a government sponsored entity that is not backed by collateral but, in the case of government agencies, is backed by the full faith and credit of the U.S. government, and, in the case of government sponsored entities, is backed by the integrity and creditworthiness of the issuer (“U.S. Agency Debentures”). The Company’s common stock, Series A Cumulative Redeemable Preferred Stock, $25.00 liquidation preference (the "Series A Preferred Stock"), and Series B Cumulative Redeemable Preferred Stock, $25.00 liquidation preference (the "Series B Preferred Stock"), trade on the New York Stock Exchange under the symbols "CYS," "CYS PrA" and "CYS PrB," respectively.
	On September 1, 2011, the Company acquired certain assets and entered into agreements to internalize the Company’s management (the “Internalization”). Prior to the Internalization, the Company had been managed by Cypress Sharpridge Advisors LLC (the “Manager”) pursuant to a management agreement (the “Management Agreement”). The Manager had entered into sub-advisory agreements with Sharpridge Capital Management, L.P. (“Sharpridge”) and an affiliate of The Cypress Group, pursuant to which the Manager was provided with all of the resources and assets (the “Assets”) used to operate the Company’s business and manage the Company’s assets. In connection with the completion of the Internalization, the Management Agreement, sub-advisory agreements and other ancillary agreements related thereto were terminated. No termination fee was incurred or paid as a result of terminating those agreements. In connection with the Internalization, the Company changed its name from “Cypress Sharpridge Investments, Inc.” to “CYS Investments, Inc.” on September 1, 2011. The results of the Internalization were not material to the Company’s results of operations.

Significant_Accounting_Policie

Significant Accounting Policies (Notes)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

'

Significant Accounting Policies [Text Block]

'

SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). The Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 946, Clarification of the Scope of Audit and Accounting Guide Investment Companies (“ASC 946”), prior to its deferral in February 2008. Under ASC 946, the Company uses financial reporting for investment companies.

Segment Reporting

The Company operates as a single segment reporting to the Chief Executive Officer, who manages the entire investment portfolio.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant estimates include, but are not limited to, investment valuation. Actual results could differ from those management estimates.

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, cash held in banks and highly liquid investments with original maturities of three months or less. Interest income earned on cash and cash equivalents is recorded in other income.

Offsetting

Repurchase agreements and derivative contracts are entered into by the Company under Master Repurchase Agreements (“MRA”) and International Standard Derivative Agreements (“ISDA”). Pursuant to the terms of the MRA or ISDA, the Company receives or posts securities and/or cash as collateral with a market value that may be in excess of the purchase price to be paid or received by the Company upon the maturity of the transaction. With repurchase agreements and derivatives, typically the Company and the counterparties are permitted to sell, re-pledge, or use the collateral associated with the transaction. MRAs and ISDAs may include provisions that permit the Company and/or a counterparty, under certain circumstances, including under defined events of default, to offset payables and/or receivables under transactions entered into pursuant to the terms of an MRA or ISDA with collateral held and/or posted to the counterparty and create one single net payment due to or from the Company. However, bankruptcy or insolvency laws of a particular jurisdiction under which a counterparty may become subject in the event of an MRA or ISDA counterparty’s bankruptcy or insolvency may impose restrictions on or prohibitions against any such right of offset. Upon a bankruptcy or insolvency of an MRA or ISDA counterparty, the Company may be considered an unsecured creditor with respect to excess collateral pledged to the counterparty and, as such, the return of excess collateral may be delayed, the amount returned reduced, or otherwise prohibited, depending on the final determination and outcome of any such bankruptcy or insolvency proceedings. The Company reports amounts subject to its’ MRAs and ISDAs in the statement of assets and liabilities on a gross basis without regard for such rights of offset.

At December 31, 2013, the Company's derivative assets and liabilities (by type) are as follows (in millions):

Assets

Liabilities

Interest rate swap contracts

$

61

$

29.5

Interest rate cap contracts

234.7

—

Total derivative assets and liabilities in the Statements of Assets and Liabilities

295.7

29.5

Derivatives not subject to a master netting agreement or similar agreement ("MNA")

11.2

0.4

Total assets and liabilities subject to a MNA

$

284.5

$

29.1

Below is a summary of the Company's assets subject to offsetting provisions (in millions):

Gross Amounts Not Offset in the Statement of Assets and Liabilities

As of

Description

Net Amounts of Assets Presented in the Statement of Assets and Liabilities

Instruments Available for Offset

Collateral Received(1)

Net Amount(2)

31-Dec-13

Derivative assets

$

284.5

$

9.2

$

244.7

$

30.6

31-Dec-12

Derivative assets

124.2

34.1

47.3

42.8

(1) Collateral consists of Agency RMBS, U.S. Treasuries and cash. Excess of collateral received is not shown for financial reporting purposes.

(2) Net amount represents the net amount receivable from the counterparty in the event of default.

Below is a summary of the Company's liabilities subject to offsetting provisions (in millions):

Gross Amounts Not Offset in the Statement of Assets and Liabilities

As of

Description

Net Amounts of Liabilities Presented in the Statement of Assets and Liabilities

Instruments Available for Offset

Collateral Pledged(1)

Net Amount(2)

31-Dec-13

Derivative liabilities

$

29.1

$

9.2

$

19.8

$

—

31-Dec-13

Repurchase agreements

11,207.00

—

11,207.00

—

31-Dec-12

Derivative liabilities

98.6

34.1

64.5

—

31-Dec-12

Repurchase agreements

13,981.30

—

13,981.30

—

(1) Collateral consists of Agency RMBS, U.S. Treasuries and cash. Further detail of collateral pledged on repurchase agreements is disclosed in note 5. Excess of collateral pledged is not shown for financial reporting purposes.

(2) Net amount represents the net amount payable from the counterparty in the event of default.

Interest Rate Swap and Cap Contracts

The Company utilizes interest rate swaps and caps to hedge the interest rate risk associated with the financing of its portfolio. Specifically, the Company seeks to hedge the exposure to potential interest rate mismatches between the interest earned on investments and the borrowing costs caused by fluctuations in short term interest rates. In a simple interest rate swap, one investor pays a floating rate of interest on a notional principal amount and receives a fixed rate of interest on the same notional principal amount for a specified period of time. Alternatively, an investor may pay a fixed rate and receive a floating rate. In a simple interest rate cap, one investor pays a premium for a notional principal amount based on a capped interest rate (the “cap rate”). If the floating interest rate (the “floating rate”) exceeds the cap rate, the investor receives a payment from the cap counterparty equal to the difference between the floating rate and the cap rate on the same notional principal amount for a specified period of time. Alternatively, an investor may receive a premium and pay the difference in the cap rate and floating rate.

During the term of the interest rate swap or cap, the Company makes or receives periodic payments and unrealized gains or losses are recorded as a result of marking the swap and cap to their fair value. When the swap or cap is terminated, the Company records a realized gain or loss equal to the difference between the proceeds from (or cost of) the closing transaction and the Company’s cost basis in the contract, if any. The periodic payments, amortization of premiums on cap contracts and any realized or unrealized gains or losses are reported under gains and losses from swap and cap contracts in the statements of operations. Swaps involve a risk that interest rates will move contrary to the Company’s expectations, thereby increasing the Company’s payment obligation.

Because the Company uses financial reporting for investment companies, its investments, including its interest rate swap and cap contracts, are carried at fair value with changes in fair value included in earnings. Consequently, there would be no impact to designating interest rate swaps and caps as cash flow or fair value hedges under GAAP.

The interest rate swap and cap contracts and collateral posted or received on the contracts are valued daily and counterparties may require additional collateral when the fair value of the contracts or collateral declines. Conversely, the Company may require the counterparty to post collateral to it when the fair value of the contracts or collateral increases. The Company's interest rate swap and cap contracts are subject to master netting arrangements. The Company is exposed to credit loss in the event of nonperformance by the counterparty to the swap or cap limited to the fair value of collateral posted in excess of the fair value of the contract in a net liability position and the shortage of the fair value of collateral posted for the contract in a net asset position. As of December 31, 2013 and 2012, the Company did not anticipate nonperformance by any counterparty. Should interest rates move unexpectedly, the Company may not achieve the anticipated benefits of the interest rate swap or cap and may realize a loss.

Investment Valuation

The Company has established a pricing committee responsible for establishing valuation policies and procedures as well as approving valuations on a monthly basis at a pricing meeting. The pricing committee is made up of individuals from the accounting team, the investment team and senior management.

Agency RMBS, U.S. Agency Debentures and U.S. Treasury Securities are generally valued on the basis of valuations provided by third party pricing services, as derived from such services’ pricing models. Inputs to the models may include, but are not limited to, reported trades, executable bid and asked prices, broker quotations, prices or yields of securities with similar characteristics, benchmark curves or information pertaining to the issuer, as well as industry and economic events. The pricing services may use a matrix approach, which considers information regarding securities with similar characteristics to determine the valuation for a security.

Interest rate swaps and caps are generally valued with level two inputs using valuations provided by broker quotations. Such broker quotations are based on the present value of fixed and projected floating rate cash flows over the term of the swap contract. Future cash flows are discounted to their present value using swap rates provided by electronic data services or brokers. No credit valuation adjustments were made in determining the fair value of the Company's interest rate swaps and caps.

Fair values of long-lived assets, including real estate, are primarily derived internally and are based on inputs observed from sales transactions for similar assets. For real estate, fair values are based on discounted cash flow estimates which reflect current and projected lease profiles and available industry information about capitalization rates and expected trends in rents and occupancy.

All valuations received from third party pricing services or broker quotes are non-binding. To date, the Company has not adjusted any of the prices received from third party pricing services or brokers, and all prices are reviewed by the Company. This review includes comparisons of similar market transactions, alternative third party pricing services and broker quotes, or comparisons to a pricing model. To ensure the proper classification within the fair value hierarchy, the Company reviews the third party pricing service’s methodology to understand whether observable or unobservable inputs are being used.

Agency RMBS

The Company’s investments in Agency RMBS consist of pass-through certificates backed by fixed rate, monthly reset adjustable-rate loans (“ARMs”) and hybrid ARMs, the principal and interest of which are guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae. Hybrid ARMs have interest rates that have an initial fixed period (typically three, five, seven or ten years) and thereafter reset at regular intervals in a manner similar to ARMs.

Forward Settling Transactions

The Company engages in forward settling transactions to purchase certain securities. The Company records forward settling transactions on the trade date and maintains security positions such that sufficient liquid assets will be available to make payment on the settlement date for the securities purchased. Securities purchased on a forward settling basis are carried at fair value and only begin earning interest on the settlement date. Losses may occur on these transactions due to changes in market conditions or the failure of counterparties to perform under the contract. Among other forward settling transactions, the Company from time to time transacts in to-be-announced securities (“TBAs”). As with other forward settling transactions, a seller agrees to issue TBAs at a future date. However, the seller does not specify the particular securities to be delivered. Instead, the Company agrees to accept any security that meets specified terms such as issuer, interest rate and terms of underlying mortgages. The Company records TBAs on the trade date utilizing information associated with the specified terms of the transaction as opposed to the specific mortgages. TBAs are carried at fair value and begin earning interest on the settlement date. Losses may occur due to the fact that the actual underlying mortgages received may be less favorable than those anticipated by the Company.

As of December 31, 2013 and 2012 the Company had pledged Agency RMBS with a fair value of $12.3 million and $10.4 million, respectively, on its open forward settling transactions.

Repurchase Agreements

Repurchase agreements are secured borrowings that are collateralized by the Company’s Agency RMBS and are carried at their amortized cost, which approximates their fair value due to their short term nature, generally 30-90 days. The Company’s repurchase agreements are with a diversified group of commercial and investment banks. Collateral is valued daily and counterparties may require additional collateral when the fair value of the collateral declines. Conversely, the Company may require the counterparty to post collateral to it when the fair value of the collateral increases. Counterparties have the right to sell or repledge collateral pledged for repurchase agreements, however they are required to return collateral that is the same or substantially similar to the original collateral.

Investment Transactions and Income

The Company records its transactions in securities on a trade date basis. Realized gains and losses on securities transactions are recorded on an identified cost basis. Interest income and expense are recorded on the accrual basis. Interest income on Agency RMBS is accrued based on outstanding principal amount of the securities and their contractual terms. Interest on CLOs was accrued at a rate determined based on estimated future cash flows and adjusted prospectively as future cash flow amounts were recast. For CLOs placed on nonaccrual status or when the Company could not reliably estimate cash flows, the cost recovery method was used. Amortization of premium and accretion of discount are recorded using the yield to maturity method, and are included in investment income in the statements of operations. The Company does not estimate prepayments when calculating the yield to maturity. The amount of premium or discount associated with a prepayment is recorded through investment income on the statements of operations as they occur.

Compensation and Benefits

Included in the Company’s compensation and benefits are salaries, incentive compensation, benefits, share based compensation and the expense relating to restricted common stock granted to non-employees (prior to the Internalization). The Company accounts for share based compensation using the fair value based methodology prescribed by ASC 718, Share Based Payment (“ASC 718”). Compensation cost related to restricted common stock issued is measured at its estimated fair value at the grant date and recognized as expense over the vesting period. Prior to the Internalization, compensation cost related to restricted common stock and common stock options issued to the Company’s executive officers, certain employees of its Manager and its sub-advisors and other individuals who provided services to the Company, was initially measured at estimated fair value at the grant date and was remeasured on subsequent dates to the extent the awards were unvested.

Income Taxes

The Company has elected to be taxed as a REIT and intends to continue to comply with provisions of the Code with respect thereto. As a REIT, the Company generally will not be subject to federal or state income tax on income that it currently distributes to its stockholders. To maintain its qualification as a REIT, the Company must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other tests relating to assets and income.

Earnings Per Share (“EPS”)

Basic EPS is computed using the two class method by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted average number of common shares outstanding calculated excluding unvested stock awards. Diluted EPS is computed by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted average number of common shares outstanding calculated excluding unvested stock awards, giving effect to common stock options and warrants, if they are not anti-dilutive. See Note 3 for EPS computations.

Recent Accounting Pronouncements

In June 2013, the FASB issued ASU 2013-08, Financial Services-Investment Companies (Topic 946). This update modifies the guidance for Topic 946 for determining whether an entity is an investment company for GAAP purposes. Because the Company adopted Statement of Position 07-1 prior to its indefinite deferral, this update required management to assess whether the Company continues to meet the definition of an investment company for GAAP purposes. The guidance is effective for interim and annual reporting periods in fiscal years that begin after December 15, 2013, with prospective application. Earlier application is prohibited.

Management has performed its assessment and determined that the Company does not meet the definition of an investment company in accordance with Topic 946. As a result, the Company will discontinue application of Topic 946 and shall account for its investments in conformity with applicable non-investment company U.S. GAAP, with prospective application on the effective date. Management does not expect there will be any cumulative effect adjustments to retained earnings upon adoption as all investments will continue to be recorded at fair value on the balance sheet subsequent to adoption. See Note 14, "Subsequent Events", for additional information.

Earnings_Per_Share_Notes

Earnings Per Share (Notes)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	EARNINGS PER SHARE
	Components of the computation of basic and diluted EPS under the two-class method were as follows (in thousands, except per share numbers):
		Year Ended December 31,
		2013			2012			2011
	Net income (loss)	$	(475,782	)	$	372,787		$	291,933
	Less dividend on preferred shares	(15,854		)	(2,405		)	—
	Net income (loss) available to common shares	(491,636		)	370,382			291,933
	Less dividends paid:
	Common shares	(221,957		)	(355,548		)	(184,383		)
	Unvested shares	(1,128		)	(1,640		)	(1,592		)
	Undistributed earnings (loss)	$	(714,721	)	$	13,194		$	105,958
	Basic weighted average shares outstanding:
	Common shares	169,967			139,651			78,992
	Basic earnings (loss) per common share:
	Distributed earnings	$	1.31		$	2.55		$	2.33
	Undistributed earnings	(4.21		)	0.09			1.33
	Basic earnings (loss) per common share	$	(2.90	)	$	2.64		$	3.66
	Diluted weighted average shares outstanding:
	Common shares	169,967			139,651			78,992
	Net effect of dilutive warrants (1)	—			—			1
		169,967			139,651			78,993
	Diluted earnings (loss) per common share:
	Distributed earnings	$	1.31		$	2.55		$	2.33
	Undistributed earnings	(4.21		)	0.09			1.33
	Diluted earnings (loss) per common share	$	(2.90	)	$	2.64		$	3.66
	__________________
	-1	For the year ended December 31, 2013, 2012 and 2011, the Company had an aggregate of 131 stock options outstanding with a weighted average exercise price of $30.00 that were not included in the calculation of EPS, as their inclusion would have been anti-dilutive. These instruments may have a dilutive impact on future EPS.

Investments_In_Securities_And_

Investments In Securities And Interest Rate Swap And Cap Contracts (Notes)	12 Months Ended
	Dec. 31, 2013
Derivative, Fair Value, Net [Abstract]	'
Investments In Securities And Interest Rate Swap And Cap Contracts	'
	INVESTMENTS IN SECURITIES AND INTEREST RATE SWAP AND CAP CONTRACTS AND OTHER ASSETS
	The Company’s valuation techniques use observable and unobservable inputs. Observable inputs reflect the assumptions market participants would use in pricing an asset or liability developed based on market data obtained from sources independent of the Company, while unobservable inputs reflect the Company’s own assumptions about the assumptions market participants would use in pricing an asset or liability developed based on the best information available in the circumstances. ASC 820, Fair Value Measurements, classifies these inputs into the following hierarchy:
	Level 1 Inputs—Quoted prices for identical instruments in active markets.
	Level 2 Inputs—Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.
	Level 3 Inputs—Instruments with primarily unobservable value drivers.
	Excluded from the tables below are financial instruments carried on the accompanying financial statements at cost basis, which is deemed to approximate fair value, primarily due to the short duration of these instruments, including cash and cash equivalents, receivables, payables and borrowings under repurchase arrangements with initial terms of one year or less. As of December 31, 2013 and 2012, the fair value of these instruments is determined using level two inputs. There were no transfers between Level 1, Level 2 or Level 3 during 2013 and 2012. The following tables provide a summary of the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2013 and 2012 (in thousands):
	31-Dec-13	Fair Value Measurements Using
	Assets	Level 1				Level 2				Level 3				Total
	Agency RMBS	$	—			$	13,858,848			$	—			$	13,858,848
	Other investments	—				—				6,945				6,945
	Derivative assets	—				295,707				—				295,707
	Total	$	—			$	14,154,555			$	6,945			$	14,161,500
	Liabilities
	Derivative liabilities	$	—			$	29,458			$	—			$	29,458
	31-Dec-12	Fair Value Measurements Using
	Assets	Level 1				Level 2				Level 3				Total
	Agency RMBS	$	—			$	20,804,143			$	—			$	20,804,143
	U.S. Treasury Bills	37,999				—				—				37,999
	Other investments	—				—				19,576				19,576
	Derivative assets	—				124,169				—				124,169
	Total	$	37,999			$	20,928,312			$	19,576			$	20,985,887
	Liabilities
	Derivative liabilities	$	—			$	98,575			$	—			$	98,575
	Other investments is comprised of CLOs and real estate assets. The table below presents a reconciliation of changes in other investments classified as Level 3 in the Company’s financial statements for the year ended December 31, 2013 and 2012. A discussion of the method of fair valuing these assets is included above in “Investment Valuation.” CLOs are generally valued using valuations provided by broker quotations. The Company validates the broker quotations using internal discounted cash flow models. The significant unobservable inputs used in the fair value measurement of the Company’s CLOs are prepayment rates, probability of default, and recovery rate in the event of default. Significant changes in any of those inputs in isolation would result in a materially different fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumption used for the loss severity upon default and a directionally opposite change in the assumption used for prepayment rates. The Company did not hold any CLOs as of December 31, 2013. The weighted average inputs to the models were:
			Constant Prepayment Rate			Default Rate			Recovery Rate			Recovery Lag
	31-Dec-12		20	%		2	%		69	%		6 Months
	Fair values of real estate assets are valued based on discounted cash flow models. A discussion of the method of fair valuing these assets is included above in Note 2 “Investment Valuation.” The significant unobservable input used in the fair value measurement is capitalization rates, which the Company estimated to be between 3% and 5% at December 31, 2013 and 2012.
	Level 3 Fair Value Reconciliation
		Year Ended December 31,
	(In thousands)	2013				2012
	Other investments
	Beginning balance level 3 assets	$	19,576			$	18,675
	Cash payments recorded as a reduction of cost basis	(324		)		(3,464		)
	Change in net unrealized appreciation (depreciation)	(6,721		)		3,364
	Net purchases (sales)	(12,005		)		(1,698		)
	Net gain (loss) on sales	6,419				2,699
	Transfers into (out of) level 3	—				—
	Ending balance level 3 assets	$	6,945			$	19,576
	The Agency RMBS portfolio consisted of Agency RMBS as follows:
	December 31, 2013		Face Value				Fair Value				Weighted Average
	Asset Type		(in thousands)								Cost/Face				Fair Value/Face		MTR(1)	Coupon		CPR(2)
	15 Year Fixed Rate		$	6,337,536			$	6,510,958			$	102.58			$	102.74	N/A	3.13	%	5.3	%
	20 Year Fixed Rate		84,730				90,795				103.07				107.16		N/A	4.5	%	16	%
	30 Year Fixed Rate		5,145,151				5,214,548				102.15				101.35		N/A	3.78	%	3.6	%
	Hybrid ARMs		2,007,380				2,042,547				103.57				101.75		66.1	2.56	%	12.6	%
	Total/Weighted Average		$	13,574,797			$	13,858,848			$	102.57			$	102.09		3.3	%	6	%
	December 31, 2012		Face Value				Fair Value				Weighted Average
	Asset Type		(in thousands)								Cost/Face				Fair Value/Face		MTR(1)	Coupon		CPR(2)
	10 Year Fixed Rate		$	207,091			$	219,747			$	103.6			$	106.11	N/A	3.5	%	19.4	%
	15 Year Fixed Rate		11,092,374				11,717,136				104.32				105.63		N/A	3.05	%	16.1	%
	20 Year Fixed Rate		1,087,835				1,148,932				104.96				105.62		N/A	3.17	%	10.1	%
	30 Year Fixed Rate		3,571,692				3,817,488				105.78				106.88		N/A	3.59	%	8.9	%
	Hybrid ARMs		3,722,510				3,900,840				103.54				104.79		74.3	2.71	%	19.1	%
	Total/Weighted Average		$	19,681,502			$	20,804,143			$	104.47			$	105.7		3.1	%	15.8	%
	__________________
	(1)	MTR, or “Months to Reset” is the weighted average number of months remaining before the fixed rate on a hybrid ARM becomes a variable rate. At the end of the fixed period, the variable rate will be determined by the margin and the pre-specified caps of the ARM. After the fixed period, 100% of the hybrid ARMs in the portfolio reset annually.
	(2)	CPR, or “Constant Prepayment Rate,” is a method of expressing the prepayment rate for a mortgage pool that assumes that a constant fraction of the remaining principal is prepaid each month or year. Specifically, the CPR is an annualized version of the prior three month prepayment rate. Securities with no prepayment history are excluded from this calculation.
	As of December 31, 2013 and 2012, the Company’s Agency RMBS were purchased at a net premium to their face value with approximately $351.5 million and $879.6 million, respectively, of unamortized premium included in their cost basis. The premium purchase price is due to the average coupon interest rates on these investments being higher than prevailing market rates. The Company does not estimate prepayments when calculating the yield to maturity. During the years ended December 31, 2013, 2012 and 2011 the Company recorded $115.4 million, $111.6 million and $43.9 million, respectively, as net amortization of premium as a result prepayments.
	Actual maturities of Agency RMBS are generally shorter than stated contractual maturities (which range up to 30 years), as they are affected by the contractual lives of the underlying mortgages, periodic payments and prepayments of principal. As of December 31, 2013 and 2012, the average final contractual maturity of the Company’s Agency RMBS portfolio is in year 2036 and 2033, respectively.
	In order to mitigate its interest rate exposure, the Company enters into interest rate swap and cap contracts. The Company had the following activity in interest rate swap and cap transactions during the years ended December 31, 2013 and 2012 (in thousands):
	Year Ended December 31, 2013								Year Ended December 31, 2012
	Trade Date		Transaction		Notional				Trade Date		Transaction		Notional
	Feb-13		Opened		$	1,500,000			Apr-12		Opened		$	500,000
Mar-13		Terminated		(500,000		)		May-12		Opened		600,000
Mar-13		Opened		1,200,000				Jun-12		Opened		600,000
Apr-13		Opened		500,000				Jul-12		Opened		2,250,000
May-13		Opened		500,000				Sep-12		Opened		1,000,000
May-13		Matured		(100,000		)		Nov-12		Opened		500,000
Jun-13		Terminated		(700,000		)		Net Increase				$	5,450,000
Jun-13		Matured		(300,000		)
Jul-13		Matured		(300,000		)
Aug-13		Terminated		(2,200,000		)
Aug-13		Opened		500,000
Nov-13		Terminated		(940,000		)
Nov-13		Opened		500,000
Dec-13		Terminated		(350,000		)
Net Decrease				$	(690,000	)
As of December 31, 2013 and 2012, the Company had pledged Agency RMBS and U.S Treasury Securities with a fair value of $63.0 million and $127.6 million, respectively, as collateral on interest rate swap and cap contracts. In addition, the Company had Agency RMBS and U.S. Treasuries of $211.4 million and cash of $37.9 million pledged to it as collateral for its interest rate swap and cap contracts as of December 31, 2013. As of December 31, 2012, the Company had $18.4 million of Agency RMBS and U.S. Treasuries and $28.9 million of cash pledged to it as collateral for its interest rate swap and cap contracts. Below is a summary of our interest rate swap and cap contracts open as of December 31, 2013 and 2012 and the net gain (loss) on swap and cap contracts for the years ended December 31, 2013, 2012 and 2011 (in thousands):
Derivatives not designated as hedging instruments under ASC 815(a)
Interest Rate Swap Contracts	Notional Amount				Fair Value				Statement of Assets and Liabilities Location
December 31, 2013	$	2,050,000			$	(29,458	)		Derivative liabilities, at fair value
December 31, 2013	4,250,000				61,004				Derivative assets, at fair value
31-Dec-12	6,490,000				(98,575		)		Derivative liabilities, at fair value
December 31, 2012	1,000,000				1,180				Derivative assets, at fair value
Interest Rate Cap Contracts	Notional Amount				Fair Value				Statement of Assets and Liabilities Location
December 31, 2013	$	3,900,000			$	234,703			Derivative assets, at fair value
December 31, 2012	3,400,000				122,989				Derivative assets, at fair value
			Amount of Gain or (Loss)
			Recognized in Income on Derivatives
Derivatives Not Designated as Hedging Instruments Under ASC 815(a)	Location of Gain or (Loss) Recognized in Income on Derivative		Year Ended December 31,
			2013				2012				2011
Interest rate swap and cap contracts	Net gain (loss) from swap and cap contracts		$	175,631			$	(82,766	)		$	(160,402	)
__________________
(a)	See Note 2 for additional information on the Company’s purpose for entering into interest rate swaps and caps and the decision not to designate them as hedging instruments.
Credit Risk
At December 31, 2013 and 2012, the Company continued to have minimal exposure to credit losses on its mortgage assets by owning principally Agency RMBS. The payment of principal and interest on Agency RMBS is guaranteed by Freddie Mac, Fannie Mae or Ginnie Mae. In September 2008, both Freddie Mac and Fannie Mae were placed in the conservatorship of the United States government.
On August 5, 2011, Standard & Poor’s downgraded the U.S.’s credit rating to AA+ for the first time. Because Fannie Mae and Freddie Mac are in conservatorship of the U.S. Government, the implied credit ratings of Agency RMBS guaranteed by Freddie Mac, Fannie Mae or Ginnie Mae were also downgraded to AA+. While this downgrade did not have a significant impact on the fair value of the Agency RMBS in the Company’s portfolio, it has increased the uncertainty regarding the credit risk of Agency RMBS.

Borrowings_Notes

Borrowings (Notes)	12 Months Ended
	Dec. 31, 2013
Short-term Debt [Abstract]	'
Borrowings	'
	BORROWINGS
	The Company leverages its Agency RMBS portfolio through the use of repurchase agreements. Each of the borrowing vehicles used by the Company bears interest at floating rates based on a spread above or below LIBOR. The fair value of borrowings under repurchase agreements approximates their carrying amount due to the short term nature of these financial instruments.
	Certain information with respect to the Company’s borrowings is summarized in the following tables. Each of the borrowings listed is contractually due in one year or less (dollars in thousands).
	December 31, 2013
	Outstanding repurchase agreements	$	11,206,950
	Interest accrued thereon	$	7,204
	Weighted average borrowing rate	0.41		%
	Weighted average remaining maturity (in days)	39.9
	Fair value of the collateral(1)	$	11,760,720
	December 31, 2012
	Outstanding repurchase agreements	$	13,981,307
	Interest accrued thereon	$	11,717
	Weighted average borrowing rate	0.48		%
	Weighted average remaining maturity (in days)	19.6
	Fair value of the collateral(1)	$	14,693,645
	__________________
	-1	Collateral for repurchase agreements consisted of Agency RMBS and U.S. Treasury Securities.
	At December 31, 2013 and 2012, the Company did not have any borrowings under repurchase agreements where the amount at risk with an individual counterparty exceeded 10% of net assets.

Share_Capital_Notes

Share Capital (Notes)	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Share Capital	'
	SHARE CAPITAL
	The Company has authorized 500,000,000 shares of common stock having par value of $0.01 per share. As of December 31, 2013 and 2012, the Company had issued and outstanding 161,650,114 and 174,924,149 shares of common stock, respectively.
	The Company has authorized 50,000,000 shares of preferred stock having a par value of $0.01 per share. As of December 31, 2013 and 2012, 3,000,000 shares of 7.75% Series A Preferred Stock ($25.00 liquidation preference) were issued and outstanding. As of December 31, 2013, 8,000,000 shares of 7.50% Series B Preferred Stock ($25.00 liquidation preference) were issued and outstanding. The Series A Preferred Stock and Series B Preferred Stock will not be redeemable before August 3, 2017 and April 30 2018, respectively, except under circumstances where it is necessary to preserve the Company's qualification as a REIT, for federal income tax purposes or the occurrence of a change of control. On or after August 3, 2017 and April 30, 2018, respectively, the Company may, at its option, redeem any or all of the shares of the Series A Preferred Stock and Series B Preferred Stock, respectively, at $25.00 per share plus any accumulated and unpaid dividends to, but not including, the respective redemption date. The Series A Preferred Stock and Series B Preferred Stock have no stated maturity, and are not subject to any sinking fund or mandatory redemption.
	The Company’s common and preferred stock transactions during the year ended December 31, 2013 and 2012 are as follows (in thousands):
		Year Ended December 31, 2013					Year Ended December 31, 2012
	Common stock	Shares		Amount			Shares		Amount
	Common shares sold in public offerings or issued as restricted common stock	365		$	3,279		92,113		$	1,238,801
	Shares issued in reinvestment of distributions	—		—			96		1,294
	Shares repurchased or canceled	(13,639	)	(116,095		)	(38	)	(453		)
	Net increase	(13,274	)	$	(112,816	)	92,171		$	1,239,642
	Series A Preferred stock
	Preferred shares sold in public offerings	—		$	—		3,000		$	72,369
	Series B Preferred stock
	Preferred shares sold in public offerings	8,000		$	193,531		—		$	—
	Equity Offerings
	On February 1, 2012, the Company closed a public offering of 28,750,000 shares of its common stock at a public offering price of $13.28 per share for total net proceeds of approximately $377.3 million, after the underwriting discount and commissions and expenses.
	On July 16, 2012, the Company closed a public offering of 46,000,000 shares of its common stock at a public offering price of $13.70 per share for total net proceeds of approximately $622.2 million, after the underwriting discount and commissions and expenses.
	On August 3, 2012, the Company closed a public offering of 3,000,000 shares of its Series A Preferred Stock, liquidation preference of $25.00 per share, for total net proceeds of approximately $72.4 million, after the underwriting discount and commissions and expenses.
	On April 30, 2013, the Company closed a public offering of 8,000,000 shares of its Series B Preferred Stock, liquidation preference of $25.00 per share, for total net proceeds of approximately $193.6 million, after the underwriting discount and commissions and expenses.
	Dividend Reinvestment and Direct Stock Purchase Plan (“DSPP”)
	The Company sponsors a dividend reinvestment and direct stock purchase plan through which stockholders may purchase additional shares of common stock by reinvesting some or all of the cash dividends received on shares of common stock. Stockholders may also make optional cash purchases of shares of common stock subject to certain limitations detailed in the plan prospectus. For the year ended December 31, 2013 the Company did not issue any shares under the DSPP. For the year ended December 31, 2012, the Company issued 5.3 million shares under the DSPP, raising approximately $74.0 million of net proceeds. As of December 31, 2013 and 2012, there were approximately 4.1 million shares, respectively, available for issuance under this plan.
	Restricted Common Stock Awards
	Refer to note 8—"Stock Options and Restricted Common Stock" for a summary of restricted common stock granted to certain of its directors, officers and employees for the years ended December 31, 2013, 2012 and 2011.
	Equity Placement Program (“EPP”)
	On June 7, 2011, the Company entered into a sales agreement with JMP Securities LLC whereby the Company may, from time to time, publicly offer and sell up to 15.0 million shares of the Company’s common stock through at-the-market transactions and/or privately negotiated transactions. For the year ended December 31, 2013, the Company did not issue any shares under the plan. For the year ended December 31, 2012, the Company issued 11.9 million shares under the EPP, raising approximately $164.3 million of net proceeds. As of December 31, 2013 and 2012, approximately 3.1 million shares of common stock remained available for issuance and sale under the sales agreement.
	Share Repurchase Program
	On November 15, 2012, the Company announced that its board of directors had authorized the repurchase of shares of the Company’s common stock having an aggregate value of up to $250 million. For the year ended December 31, 2013, the Company repurchased 13.6 million shares with a weighted average purchase price of $8.49, or approximately $115.7 million in the aggregate. The Company did not make any repurchases during 2012.

Incentive_Compensation_Plan

Incentive Compensation Plan	12 Months Ended
	Dec. 31, 2013
Compensation Related Costs [Abstract]	'
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	'
	INCENTIVE COMPENSATION PLAN
	The Company has adopted Incentive Compensation Plans in 2013 ("2013 Plan"), 2012 ("2012 Plan") and 2011 ("2011 Plan") (collective, the "Bonus Plans"). Pursuant to the Bonus Plans the Company pays discretionary bonus awards (“Bonus Awards”) to eligible employees. The amount of each employee’s Bonus Award is calculated at the discretion of the Compensation Committee of the board of directors (the “Compensation Committee”) after consideration of the Company’s performance, the employee’s bonus target and performance for the applicable fiscal year and the Bonus Pool (as defined in the Bonus Plans) made available for Bonus Awards for the applicable fiscal year. The Compensation Committee has discretion to determine the total amount to be distributed from the Bonus Pool, and, subject to certain restrictions under the Bonus Plans, it also has discretion to determine what portion of each award will be paid in cash and what portion of each award will be paid in shares of restricted common stock of the Company.
	For the year ended December 31, 2013, the Compensation Committee elected to award the Company’s employees an aggregate of $7.3 million in Bonus Awards under the 2013 Plan. Approximately $4.1 million of the aggregate Bonus Award amount was accrued during the fiscal year ended December 31, 2013. The remaining $3.2 million will be paid in shares of restricted common stock to be granted in 2014, with $2.9 million and $0.3 million vesting over a five year and three year period, respectively.
	For the year ended December 31, 2012, the Compensation Committee elected to award the Company’s employees an aggregate of $8.5 million in Bonus Awards under the 2012 Plan. Approximately $4.6 million of the aggregate Bonus Award amount was paid in cash in 2012 and was accrued during the fiscal year ended December 31, 2012. The remaining $3.9 million was paid in shares of restricted common stock granted in 2013, with $3.7 million and $0.2 million vesting over a five year and three year period, respectively.
	For the period from September 1, 2011 to December 31, 2011, the Compensation Committee elected to award the Company’s employees an aggregate of $2.5 million in Bonus Awards under the 2011 Plan. Approximately $0.5 million of the aggregate Bonus Award amount was paid in cash in 2012 and was accrued during the fiscal year ended December 31, 2011. The remaining $2.0 million was paid in shares of restricted common stock granted in 2012, with $0.1 million and $1.9 million vesting over a three year and five year period, respectively.

Stock_Options_and_Restricted_S

Stock Options and Restricted Stock (Notes)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	'
	STOCK OPTIONS AND RESTRICTED COMMON STOCK
	On May 10, 2013, the Company's stockholders approved the 2013 Equity Incentive Plan (the "Equity Incentive Plan") that provides for the grant of non-qualified common stock options, stock appreciation rights, restricted common stock and other share based awards. As of December 31, 2013 the Company has only granted restricted common stock pursuant to the Equity Inventive Plan. The Compensation Committee administers the Equity Incentive Plan. Awards under the Equity Incentive Plan may be granted to the Company’s directors, executive officers and employees and other service providers.
	The Equity Incentive Plan authorizes a total of 8,500,000 shares that may be used to satisfy awards under the plan. As of December 31, 2013 the remaining shares to be granted under the Equity Incentive Plan were 8,474,198.
	Prior to May 10, 2013, the Company had a stock incentive plan (the “2006 Stock Incentive Plan”) in place that provided for the grant of non-qualified common stock options, stock appreciation rights, restricted common stock and other share based awards. Following stockholder approval of the Equity Incentive Plan the Company could no longer make awards under the 2006 Stock Incentive Plan. Under the 2006 Stock Incentive Plan the Company only granted qualified common stock options and restricted common stock. The Compensation Committee administered the plan. Awards under the 2006 Stock Incentive Plan were granted to the Company’s directors, executive officers and employees and other service providers.
	Restricted common stock granted to non-employee directors prior to January 1, 2014 vests over a one-year period. Effective January 1, 2014, all restricted common stock granted to non-employee directors, including the restricted common stock granted on January 2, 2014, will vest at the end of the quarter in which it was granted. A description of the vesting schedules for restricted common stock granted to the Company's executive officers and employees is included in note 7—"Incentive Compensation Plan". The following table summarizes restricted common stock transactions for the years ended December 31, 2013, 2012 and 2011:
	Years ended December 31, 2011, 2012 and 2013		Officers and Employees(1)		Directors			Total
	Unvested Restricted Common Stock as of December 31, 2010		754,001		22,356			776,357
	Granted (Weighted average grant date fair value $13.21)		150,000		34,446			184,446
	Canceled/Forfeited		(3,917	)	—			(3,917	)
	Vested		(355,414	)	(28,356	)		(383,770	)
	Unvested Restricted Common Stock as of December 31, 2011		544,670		28,446			573,116
	Granted (Weighted average grant date fair value $13.38)		181,618		31,668			213,286
	Canceled/Forfeited		(38,387	)	—			(38,387	)
	Vested		(113,781	)	(28,446	)		(142,227	)
	Unvested Restricted Common Stock as of December 31, 2012		574,120		31,668			605,788
	Granted (Weighted average grant date fair value $11.91)		319,979		44,765			364,744
	Canceled/Forfeited		(39,034	)	—			(39,034	)
	Vested		(135,438	)	(31,668	)		(167,106	)
	Unvested Restricted Common Stock as of December 31, 2013		719,627		44,765			764,392
	______________
	-1	Include grants to the Company’s executive officers and certain officers and employees of the Manager prior to Internalization.
	Unrecognized compensation cost related to unvested restricted common stock granted as of December 31, 2013 and 2012 was $8.0 million and $7.1 million, respectively, assuming no forfeitures due to the small number of employees and historical employee attrition. The total fair value of restricted common stock awards vested during the years ended December 31, 2013, 2012 and 2011 were $1.8 million, $2.3 million and $5.1 million, respectively, based upon the fair market value of the Company’s common stock on the vesting date.
	There were no common stock options granted during the years ended December 31, 2013, 2012 and 2011. As of December 31, 2013 and 2012, there were 131,088 options outstanding, all of which were vested and exercisable, with a weighted average exercise price of $30.00, expiration date of February 2016 and fair value of $0.00 per option.
	The components of share based compensation expense for each period were as follows (in thousands):
			Year ended December 31,
			2013			2012				2011
	Restricted shares granted to officers and employees(1)		$	3,024		$	2,440			$	4,848
	Restricted shares granted to certain directors		447			394				415
	Total shared based compensation expense		$	3,471		$	2,834			$	5,263
	_________
	-1	Includes grants to employees of the Company’s manager prior to the Internalization.

Management_Agreement_and_Relat

Management Agreement and Related Party Transactions (Notes)	12 Months Ended
	Dec. 31, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions Disclosure [Text Block]	'
	MANAGEMENT AGREEMENT AND RELATED PARTY TRANSACTIONS
	On September 1, 2011, the Company acquired certain assets and entered into agreements to effect the Internalization. Prior to the Internalization, the Company had been managed by the Manager pursuant to the Management Agreement. The Manager had entered into sub-advisory agreements with Sharpridge and an affiliate of The Cypress Group, pursuant to which the Manager was provided with all of the resources and assets used to operate the Company’s business and manage the Company’s assets. In connection with the completion of the Internalization, the Management Agreement, sub-advisory agreements and other ancillary agreements related thereto were terminated. No termination fee was incurred or paid as a result of terminating those agreements.
	The Management Agreement provided, among other things, that the Company pay to the Manager, in exchange for managing the day-to-day operations of the Company, certain fees and reimbursements, consisting of a base management fee and reimbursement for out-of-pocket and certain other costs incurred by the Manager and on behalf of the Company. The base management fee, which was paid monthly, was equal to 1/12 of (A) 1.50% of the first $250,000,000 of Net Assets (as defined in the Management Agreement), (B) 1.25% of such Net Assets that are greater than $250,000,000 and less than or equal to $500,000,000, and (C) 1.00% of such Net Assets that are greater than $500,000,000. The Company was also required to reimburse the Manager for its pro-rata portion of rent, utilities, legal and investment services, market information systems and research publications and materials. In addition, the Company recognized share based compensation expense related to common stock options and restricted common stock granted to the Company’s executive officers and affiliates of the Manager, which is included in compensation and benefits on the statement of operations.
	For the year ended December 31, 2011 the Company incurred the following in base management fees and expense reimbursement (in thousands):
		Year ended December 31, 2011*
	Base Management Fees	$	7,835
	Expense Reimbursement	607
	Total	$	8,442
	________
	* Expenses were only incurred during the period from January 1, 2011 to August 31, 2011.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	INCOME TAXES
	The Company has elected to be taxed as a REIT under Section 856 of the Code and intends to continue to comply with the provisions of the Code. As a REIT, the Company generally is not subject to federal or state income tax. To maintain its qualification as a REIT, the Company must distribute at least 90% of its REIT taxable income to its stockholders each year and meet certain other tests relating to assets and income. If the Company fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax on its taxable income at regular corporate rates. The Company may also be subject to certain state and local taxes. Under certain circumstances, even though the Company qualifies as a REIT, federal income and excise taxes may be due on its undistributed taxable income. No provision for income taxes has been provided in the accompanying financial statements related to the REIT because the Company has paid or will pay dividends in amounts that exceed at least 90% of its current year taxable income.
	Book/tax differences primarily relate to amortization of realized losses on the termination of swaps, share based compensation expense and unrealized appreciation (depreciation) on investments and interest rate swaps and caps.
	The per share tax character of the common, Series A Preferred Stock and Series B Preferred Stock distributions declared to stockholders in 2013 of $1.32, $1.9375 and $0.859375, respectively, is estimated to be $0.85, $1.9375 and $0.859375 ordinary income, respectively, and $0.47 return of capital to the Company's common stockholders.
	The estimated federal tax cost and the tax basis components of distributable earnings were as follows (in thousands):
	As of December 31, 2013
	Cost of investments	$	13,930,216
	Gross appreciation	$	58,432
	Gross depreciation	(122,855		)
	Net unrealized appreciation (depreciation)	$	(64,423	)
	Undistributed ordinary income	$	—
	Capital loss carryforwards	$	602,474
	As of December 31, 2013, the Company's estimated capital loss carryforwards available to offset future realized gains are subject to current and future limitations in accordance with Internal Revenue Code section 382 and expire as follows (in thousands):
	31-Dec-14	$	48
	31-Dec-18	602,426
	Total	$	602,474
	As of December 31, 2013 and 2012, the Company had no undistributed taxable income. Tax years from 2010 through 2013 remain open to examination by U.S. federal, state and local, or non-U.S. tax jurisdictions. No income tax provision was recorded for the Company’s open tax years.

Contingencies_Notes

Contingencies (Notes)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	The Company has leased office space in which the term expires on June 30, 2016. The lease has been classified as an operating lease. The rental expense for the year ended December 31, 2013, 2012 and 2011 was $0.4 million, $0.4 million and $0.2 million, respectively. Under this agreement, annual rental payments will be as follows throughout the term of the lease for the years ending December 31 (in thousands):
	2014	$	293
	2015	262
	2016	131
		$	686
	The Company enters into certain contracts that contain a variety of indemnifications, principally with broker dealers. As of December 31, 2013 and 2012, no claims have been asserted under these indemnification agreements. Accordingly, the Company has no liabilities recorded for these agreements as of December 31, 2013 and 2012.

Financial_Instruments_With_Off

Financial Instruments With Off-Balance Sheet Risk or Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2013
Risks and Uncertainties [Abstract]	'
Concentration Risk Disclosure [Text Block]	'
	FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK OR CONCENTRATIONS OF CREDIT RISK
	In the normal course of its business, the Company trades various financial instruments and enters into various investment activities with off-balance sheet risk, including interest rate swap contracts. These financial instruments contain varying degrees of off-balance sheet risk whereby losses resulting from changes in the fair values of the securities underlying the financial instruments or the Company’s obligations thereunder may ultimately exceed the amount recognized in the statement of assets and liabilities.
	The notional amounts of the swap and cap contracts do not represent the Company’s risk of loss due to counterparty nonperformance. The Company’s exposure to credit risk associated with counterparty nonperformance on swap or cap contracts is limited to the difference between the fair value of the swap and cap plus any accrued interest, minus the fair value of collateral pledge plus any accrued interest. The Company is also subject to credit risk associated with counterparty non performance on repurchase agreements. The Company’s exposure to credit risk associated with counterparty nonperformance on repurchase agreements is limited to the difference between the borrowings under repurchase agreements plus any accrued interest, minus the fair value of collateral pledge plus any accrued interest. Any counterparty nonperformance of these transactions is not expected to have a material effect on the Company’s financial condition.
	The Company’s investments are primarily concentrated in securities that pass through collections of principal and interest from underlying mortgages, and there is a risk that some borrowers on the underlying mortgages will default. Therefore, mortgage-backed securities may bear some exposure to credit losses. However, the Company mitigates credit risk by primarily holding securities that are either guaranteed by government (or government-sponsored) agencies.
	The Company bears certain other risks typical in investing in a portfolio of mortgage-backed securities. The principal risks potentially affecting the Company’s financial position, results of operations and cash flows include the risks that: (a) interest rate changes can negatively affect the fair value of the Company’s mortgage-backed securities, (b) interest rate changes can influence borrowers’ decisions to prepay the mortgages underlying the securities, which can negatively affect both cash flows from, and the fair value of, the securities, and (c) adverse changes in the fair value of the Company’s mortgage-backed securities and/or the inability of the Company to renew short term borrowings under repurchase agreements can result in the need to sell securities at inopportune times and incur realized losses.
	The Company enters into derivative transactions with counterparties as hedges of interest rate exposure and in the course of investing. In the event of nonperformance by a counterparty, the Company is potentially exposed to losses, although the counterparties to these agreements are primarily major financial institutions with investment grade ratings.
	The Company is subject to interest rate risk. Generally, the value of fixed income securities will change inversely with changes in interest rates. As interest rates rise, the market value of fixed income securities tends to decrease. Conversely, as interest rates fall, the market value of fixed income securities tends to increase.
	The Company’s principal trading activities are primarily with brokers and other financial institutions located in North America. All securities transactions of the Company are cleared by multiple major securities firms pursuant to customer agreements. At December 31, 2013 and 2012, substantially all the investments in securities and receivable for securities sold are positions with and amounts due from these brokers. The Company had substantially all of its individual counterparty concentrations with these brokers and their affiliates.

Financial_Highlights_Notes

Financial Highlights (Notes)	12 Months Ended
	Dec. 31, 2013
Financial Highlights [Abstract]	'
Financial Highlights	'
	FINANCIAL HIGHLIGHTS
	In accordance with financial reporting requirements applicable to investment companies, the Company has included below certain financial highlight information for the years ended December 31, 2013, 2012 and 2011:
		Per Common Share
		Year Ended December 31,
		2013			2012			2011
	Net asset value, beginning of period	$13.31			$13.02			$11.59
	Net income (loss):
	Net investment income	1.51		(a)	1.63		(a)	2.39		(a)
	Net gain (loss) from investments and swap and cap contracts	-4.3		(a)	1.03		(a)	1.27		(a)
	Net income (loss)	-2.79			2.66			3.66
	Dividends on preferred shares	-0.09		(a)	-0.02		(a)	0		(a)
	Net income (loss) available to common shares	-2.88			2.64			3.66
	Capital transactions:
	Distributions on common shares	-0.85			-2.37			-1.96
	Tax return of capital distributions	-0.47			0			-0.29
	Issuance/Repurchase of common and preferred stock and amortization of share based compensation	0.13		(a)	0.02		(a)	0.02		(a)
	Net decrease in net asset value from capital transactions	-1.19			-2.35			-2.23
	Net asset value, end of period	$9.24			$13.31			$13.02
	Net asset value total return (%)	(20.66	)%		20.43	%		31.75	%
	Market value total return (%) (b)	(27.36	)%		7.63	%		21.22	%
	Ratios to Average Net Assets
	Expenses before interest expense	0.98	%		1.05	%		2.34	%
	Total expenses	3.44	%		3.3	%		4.24	%
	Net investment income	12.04	%		11.66	%		19.3	%
	__________________
	(a)	Calculated based on average shares outstanding during the period. Average shares outstanding include vested and unvested restricted shares and differs from weighted average shares outstanding used in calculating EPS (see Note 3).
	(b)	Calculated based on the change in market value of the Company's common shares taking into account dividends reinvested in accordance with the terms of the DSPP.

Subsequent_Events_Notes

Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	SUBSEQUENT EVENTS
	On January 1, 2014, an aggregate of 15,246 shares of restricted common stock were granted to certain directors as a portion of their compensation for serving on the Company’s board of directors.
	The CPR of the Company’s Agency RMBS portfolio was approximately 5.9% and 5.3% for the month of January 2014 and February 2014, respectively.
	Effective January 1, 2014, the Company discontinued its application of Topic 946. Upon transition, management elected the Fair Value Option (“FVO”) under ASC 825 for all investments held. As a result of the FVO election, all changes in the fair value of investments held on January 1, 2014 will continue to be recorded in the Company’s statement of operations. In addition, the Company has elected not to designate its derivatives as hedging instruments in accordance with ASC 815. As a result, all changes in the fair value of derivative instruments held on January 1, 2014 will also continue to be recorded in the Company’s statement of operations.
	Discontinuance of Topic 946 accounting will change the presentation of the Company's financial statements prospectively, the most significant of which are as follows:
	(i)	the removal of the schedule of investments and financial highlights,
	(ii)	reformatting of the balance sheet to a consolidated balance sheet presentation,
	(iii)	reformatting of the statement of operations with the inclusion of the statement of comprehensive income (loss) as applicable,
	(iv)	the removal of the statement of changes in net assets and inclusion of a statement of changes in stockholders’ equity,
	(v)	reformatting of the statement of cash flows with the inclusion of an investing section, and
	(vi)	changes to certain footnotes to reflect conformity with applicable U.S. GAAP for non-investment companies, including summary information on the amortization/accretion of bond premium/discounts.

Summary_of_Quarterly_Results_o

Summary of Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2013
Statement of Financial Position [Abstract]	'
Quarterly Financial Information [Text Block]	'
	SUMMARY OF QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)
		Three Months Ended
	(in thousands except per share numbers)	31-Dec-13			30-Sep-13			30-Jun-13			31-Mar-13
	Total investment income	$	91,743		$	85,636		$	81,551		$	73,101
	Total expenses	15,930			17,566			19,718			20,584
	Net investment income	75,813			68,070			61,833			52,517
	Net gain (loss) from investments	(190,321		)	15,781			(656,295		)	(78,811		)
	Net gain (loss) from swap and cap contracts	22,644			(53,280		)	196,176			10,091
	Net income (loss)	$	(91,864	)	$	30,571		$	(398,286	)	$	(16,203	)
	Dividend on preferred shares	(5,203		)	(5,203		)	(3,995		)	(1,453		)
	Net income (loss) available to common shares	$	(97,067	)	$	25,368		$	(402,281	)	$	(17,656	)
	Net income (loss) per common share basic & diluted	$	(0.59	)	$	0.14		$	(2.32	)	$	(0.10	)
		Three Months Ended
	(in thousands except per share numbers)	31-Dec-12			30-Sep-12			30-Jun-12			31-Mar-12
	Total investment income	$	79,579		$	76,631		$	71,747		$	65,369
	Total expenses	21,165			17,233			14,272			11,972
	Net investment income	58,414			59,398			57,475			53,397
	Net gain (loss) from investments	(95,994		)	221,127			68,586			33,150
	Net gain (loss) from swap and cap contracts	(2,363		)	(38,618		)	(24,356		)	(17,429		)
	Net income (loss)	$	(39,943	)	$	241,907		$	101,705		$	69,118
	Dividend on preferred shares	(1,452		)	(953		)	—			—
	Net income (loss) available to common shares	$	(41,395	)	$	240,954		$	101,705		$	69,118
	Net income (loss) per common share basic & diluted	$	(0.24	)	$	1.46		$	0.87		$	0.66

Significant_Accounting_Policie1

Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

'

Basis Of Presentation

'

Basis of Presentation

The accompanying financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). The Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 946, Clarification of the Scope of Audit and Accounting Guide Investment Companies (“ASC 946”), prior to its deferral in February 2008. Under ASC 946, the Company uses financial reporting for investment companies.

Segment Reporting

'

Segment Reporting

The Company operates as a single segment reporting to the Chief Executive Officer, who manages the entire investment portfolio.

Use Of Estimates

'

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant estimates include, but are not limited to, investment valuation. Actual results could differ from those management estimates.

Cash And Cash Equivalents

'

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, cash held in banks and highly liquid investments with original maturities of three months or less. Interest income earned on cash and cash equivalents is recorded in other income.

Offsetting Assets

'

Offsetting

Repurchase agreements and derivative contracts are entered into by the Company under Master Repurchase Agreements (“MRA”) and International Standard Derivative Agreements (“ISDA”). Pursuant to the terms of the MRA or ISDA, the Company receives or posts securities and/or cash as collateral with a market value that may be in excess of the purchase price to be paid or received by the Company upon the maturity of the transaction. With repurchase agreements and derivatives, typically the Company and the counterparties are permitted to sell, re-pledge, or use the collateral associated with the transaction. MRAs and ISDAs may include provisions that permit the Company and/or a counterparty, under certain circumstances, including under defined events of default, to offset payables and/or receivables under transactions entered into pursuant to the terms of an MRA or ISDA with collateral held and/or posted to the counterparty and create one single net payment due to or from the Company. However, bankruptcy or insolvency laws of a particular jurisdiction under which a counterparty may become subject in the event of an MRA or ISDA counterparty’s bankruptcy or insolvency may impose restrictions on or prohibitions against any such right of offset. Upon a bankruptcy or insolvency of an MRA or ISDA counterparty, the Company may be considered an unsecured creditor with respect to excess collateral pledged to the counterparty and, as such, the return of excess collateral may be delayed, the amount returned reduced, or otherwise prohibited, depending on the final determination and outcome of any such bankruptcy or insolvency proceedings. The Company reports amounts subject to its’ MRAs and ISDAs in the statement of assets and liabilities on a gross basis without regard for such rights of offset.

At December 31, 2013, the Company's derivative assets and liabilities (by type) are as follows (in millions):

Assets

Liabilities

Interest rate swap contracts

$

61

$

29.5

Interest rate cap contracts

234.7

—

Total derivative assets and liabilities in the Statements of Assets and Liabilities

295.7

29.5

Derivatives not subject to a master netting agreement or similar agreement ("MNA")

11.2

0.4

Total assets and liabilities subject to a MNA

$

284.5

$

29.1

Below is a summary of the Company's assets subject to offsetting provisions (in millions):

Gross Amounts Not Offset in the Statement of Assets and Liabilities

As of

Description

Net Amounts of Assets Presented in the Statement of Assets and Liabilities

Instruments Available for Offset

Collateral Received(1)

Net Amount(2)

31-Dec-13

Derivative assets

$

284.5

$

9.2

$

244.7

$

30.6

31-Dec-12

Derivative assets

124.2

34.1

47.3

42.8

(1) Collateral consists of Agency RMBS, U.S. Treasuries and cash. Excess of collateral received is not shown for financial reporting purposes.

(2) Net amount represents the net amount receivable from the counterparty in the event of default.

Below is a summary of the Company's liabilities subject to offsetting provisions (in millions):

Gross Amounts Not Offset in the Statement of Assets and Liabilities

As of

Description

Net Amounts of Liabilities Presented in the Statement of Assets and Liabilities

Instruments Available for Offset

Collateral Pledged(1)

Net Amount(2)

31-Dec-13

Derivative liabilities

$

29.1

$

9.2

$

19.8

$

—

31-Dec-13

Repurchase agreements

11,207.00

—

11,207.00

—

31-Dec-12

Derivative liabilities

98.6

34.1

64.5

—

31-Dec-12

Repurchase agreements

13,981.30

—

13,981.30

—

(1) Collateral consists of Agency RMBS, U.S. Treasuries and cash. Further detail of collateral pledged on repurchase agreements is disclosed in note 5. Excess of collateral pledged is not shown for financial reporting purposes.

(2) Net amount represents the net amount payable from the counterparty in the event of default.

Interest Rate Swap And Cap Contracts

'

Interest Rate Swap and Cap Contracts

The Company utilizes interest rate swaps and caps to hedge the interest rate risk associated with the financing of its portfolio. Specifically, the Company seeks to hedge the exposure to potential interest rate mismatches between the interest earned on investments and the borrowing costs caused by fluctuations in short term interest rates. In a simple interest rate swap, one investor pays a floating rate of interest on a notional principal amount and receives a fixed rate of interest on the same notional principal amount for a specified period of time. Alternatively, an investor may pay a fixed rate and receive a floating rate. In a simple interest rate cap, one investor pays a premium for a notional principal amount based on a capped interest rate (the “cap rate”). If the floating interest rate (the “floating rate”) exceeds the cap rate, the investor receives a payment from the cap counterparty equal to the difference between the floating rate and the cap rate on the same notional principal amount for a specified period of time. Alternatively, an investor may receive a premium and pay the difference in the cap rate and floating rate.

During the term of the interest rate swap or cap, the Company makes or receives periodic payments and unrealized gains or losses are recorded as a result of marking the swap and cap to their fair value. When the swap or cap is terminated, the Company records a realized gain or loss equal to the difference between the proceeds from (or cost of) the closing transaction and the Company’s cost basis in the contract, if any. The periodic payments, amortization of premiums on cap contracts and any realized or unrealized gains or losses are reported under gains and losses from swap and cap contracts in the statements of operations. Swaps involve a risk that interest rates will move contrary to the Company’s expectations, thereby increasing the Company’s payment obligation.

Because the Company uses financial reporting for investment companies, its investments, including its interest rate swap and cap contracts, are carried at fair value with changes in fair value included in earnings. Consequently, there would be no impact to designating interest rate swaps and caps as cash flow or fair value hedges under GAAP.

The interest rate swap and cap contracts and collateral posted or received on the contracts are valued daily and counterparties may require additional collateral when the fair value of the contracts or collateral declines. Conversely, the Company may require the counterparty to post collateral to it when the fair value of the contracts or collateral increases. The Company's interest rate swap and cap contracts are subject to master netting arrangements. The Company is exposed to credit loss in the event of nonperformance by the counterparty to the swap or cap limited to the fair value of collateral posted in excess of the fair value of the contract in a net liability position and the shortage of the fair value of collateral posted for the contract in a net asset position. As of December 31, 2013 and 2012, the Company did not anticipate nonperformance by any counterparty. Should interest rates move unexpectedly, the Company may not achieve the anticipated benefits of the interest rate swap or cap and may realize a loss.

Investment Valuation

'

Investment Valuation

The Company has established a pricing committee responsible for establishing valuation policies and procedures as well as approving valuations on a monthly basis at a pricing meeting. The pricing committee is made up of individuals from the accounting team, the investment team and senior management.

Agency RMBS, U.S. Agency Debentures and U.S. Treasury Securities are generally valued on the basis of valuations provided by third party pricing services, as derived from such services’ pricing models. Inputs to the models may include, but are not limited to, reported trades, executable bid and asked prices, broker quotations, prices or yields of securities with similar characteristics, benchmark curves or information pertaining to the issuer, as well as industry and economic events. The pricing services may use a matrix approach, which considers information regarding securities with similar characteristics to determine the valuation for a security.

Interest rate swaps and caps are generally valued with level two inputs using valuations provided by broker quotations. Such broker quotations are based on the present value of fixed and projected floating rate cash flows over the term of the swap contract. Future cash flows are discounted to their present value using swap rates provided by electronic data services or brokers. No credit valuation adjustments were made in determining the fair value of the Company's interest rate swaps and caps.

Fair values of long-lived assets, including real estate, are primarily derived internally and are based on inputs observed from sales transactions for similar assets. For real estate, fair values are based on discounted cash flow estimates which reflect current and projected lease profiles and available industry information about capitalization rates and expected trends in rents and occupancy.

All valuations received from third party pricing services or broker quotes are non-binding. To date, the Company has not adjusted any of the prices received from third party pricing services or brokers, and all prices are reviewed by the Company. This review includes comparisons of similar market transactions, alternative third party pricing services and broker quotes, or comparisons to a pricing model. To ensure the proper classification within the fair value hierarchy, the Company reviews the third party pricing service’s methodology to understand whether observable or unobservable inputs are being used.

Agency RMBS

'

Agency RMBS

The Company’s investments in Agency RMBS consist of pass-through certificates backed by fixed rate, monthly reset adjustable-rate loans (“ARMs”) and hybrid ARMs, the principal and interest of which are guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae. Hybrid ARMs have interest rates that have an initial fixed period (typically three, five, seven or ten years) and thereafter reset at regular intervals in a manner similar to ARMs.

Forward Settling Transactions

'

Forward Settling Transactions

The Company engages in forward settling transactions to purchase certain securities. The Company records forward settling transactions on the trade date and maintains security positions such that sufficient liquid assets will be available to make payment on the settlement date for the securities purchased. Securities purchased on a forward settling basis are carried at fair value and only begin earning interest on the settlement date. Losses may occur on these transactions due to changes in market conditions or the failure of counterparties to perform under the contract. Among other forward settling transactions, the Company from time to time transacts in to-be-announced securities (“TBAs”). As with other forward settling transactions, a seller agrees to issue TBAs at a future date. However, the seller does not specify the particular securities to be delivered. Instead, the Company agrees to accept any security that meets specified terms such as issuer, interest rate and terms of underlying mortgages. The Company records TBAs on the trade date utilizing information associated with the specified terms of the transaction as opposed to the specific mortgages. TBAs are carried at fair value and begin earning interest on the settlement date. Losses may occur due to the fact that the actual underlying mortgages received may be less favorable than those anticipated by the Company.

As of December 31, 2013 and 2012 the Company had pledged Agency RMBS with a fair value of $12.3 million and $10.4 million, respectively, on its open forward settling transactions.

Repurchase Agreements

'

Repurchase Agreements

Repurchase agreements are secured borrowings that are collateralized by the Company’s Agency RMBS and are carried at their amortized cost, which approximates their fair value due to their short term nature, generally 30-90 days. The Company’s repurchase agreements are with a diversified group of commercial and investment banks. Collateral is valued daily and counterparties may require additional collateral when the fair value of the collateral declines. Conversely, the Company may require the counterparty to post collateral to it when the fair value of the collateral increases. Counterparties have the right to sell or repledge collateral pledged for repurchase agreements, however they are required to return collateral that is the same or substantially similar to the original collateral.

Investment Transactions And Income

'

Investment Transactions and Income

The Company records its transactions in securities on a trade date basis. Realized gains and losses on securities transactions are recorded on an identified cost basis. Interest income and expense are recorded on the accrual basis. Interest income on Agency RMBS is accrued based on outstanding principal amount of the securities and their contractual terms. Interest on CLOs was accrued at a rate determined based on estimated future cash flows and adjusted prospectively as future cash flow amounts were recast. For CLOs placed on nonaccrual status or when the Company could not reliably estimate cash flows, the cost recovery method was used. Amortization of premium and accretion of discount are recorded using the yield to maturity method, and are included in investment income in the statements of operations. The Company does not estimate prepayments when calculating the yield to maturity. The amount of premium or discount associated with a prepayment is recorded through investment income on the statements of operations as they occur.

Compensation and Benefits

'

Compensation and Benefits

Included in the Company’s compensation and benefits are salaries, incentive compensation, benefits, share based compensation and the expense relating to restricted common stock granted to non-employees (prior to the Internalization). The Company accounts for share based compensation using the fair value based methodology prescribed by ASC 718, Share Based Payment (“ASC 718”). Compensation cost related to restricted common stock issued is measured at its estimated fair value at the grant date and recognized as expense over the vesting period. Prior to the Internalization, compensation cost related to restricted common stock and common stock options issued to the Company’s executive officers, certain employees of its Manager and its sub-advisors and other individuals who provided services to the Company, was initially measured at estimated fair value at the grant date and was remeasured on subsequent dates to the extent the awards were unvested.

Income Taxes

'

Income Taxes

The Company has elected to be taxed as a REIT and intends to continue to comply with provisions of the Code with respect thereto. As a REIT, the Company generally will not be subject to federal or state income tax on income that it currently distributes to its stockholders. To maintain its qualification as a REIT, the Company must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other tests relating to assets and income.

Earnings Per Share (EPS)

'

Earnings Per Share (“EPS”)

Basic EPS is computed using the two class method by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted average number of common shares outstanding calculated excluding unvested stock awards. Diluted EPS is computed by dividing net income (loss), after adjusting for the impact of unvested stock awards deemed to be participating securities, by the weighted average number of common shares outstanding calculated excluding unvested stock awards, giving effect to common stock options and warrants, if they are not anti-dilutive. See Note 3 for EPS computations.

Recent Accounting Pronouncements

'

Recent Accounting Pronouncements

In June 2013, the FASB issued ASU 2013-08, Financial Services-Investment Companies (Topic 946). This update modifies the guidance for Topic 946 for determining whether an entity is an investment company for GAAP purposes. Because the Company adopted Statement of Position 07-1 prior to its indefinite deferral, this update required management to assess whether the Company continues to meet the definition of an investment company for GAAP purposes. The guidance is effective for interim and annual reporting periods in fiscal years that begin after December 15, 2013, with prospective application. Earlier application is prohibited.

Management has performed its assessment and determined that the Company does not meet the definition of an investment company in accordance with Topic 946. As a result, the Company will discontinue application of Topic 946 and shall account for its investments in conformity with applicable non-investment company U.S. GAAP, with prospective application on the effective date. Management does not expect there will be any cumulative effect adjustments to retained earnings upon adoption as all investments will continue to be recorded at fair value on the balance sheet subsequent to adoption. See Note 14, "Subsequent Events", for additional information.

Significant_Accounting_Policie2

Significant Accounting Policies Derivative assets and liabilities by type (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Derivative Instruments [Table Text Block]	'
	At December 31, 2013, the Company's derivative assets and liabilities (by type) are as follows (in millions):
		Assets		Liabilities
	Interest rate swap contracts	$	61	$	29.5
	Interest rate cap contracts	234.7		—
	Total derivative assets and liabilities in the Statements of Assets and Liabilities	295.7		29.5
	Derivatives not subject to a master netting agreement or similar agreement ("MNA")	11.2		0.4
	Total assets and liabilities subject to a MNA	$	284.5	$	29.1

Significant_Accounting_Policie3

Significant Accounting Policies Assets subject to offsetting provisions (Tables) (Tables)	12 Months Ended
	Dec. 31, 2013
Assets subject to offsetting provisions [Line Items]	'
Assets subject to offsetting provisions [Table Text Block]	'
	Below is a summary of the Company's assets subject to offsetting provisions (in millions):
					Gross Amounts Not Offset in the Statement of Assets and Liabilities
	As of	Description	Net Amounts of Assets Presented in the Statement of Assets and Liabilities		Instruments Available for Offset		Collateral Received(1)		Net Amount(2)
	31-Dec-13	Derivative assets	$	284.5	$	9.2	$	244.7	$	30.6
	31-Dec-12	Derivative assets	124.2		34.1		47.3		42.8
	(1) Collateral consists of Agency RMBS, U.S. Treasuries and cash. Excess of collateral received is not shown for financial reporting purposes.
	(2) Net amount represents the net amount receivable from the counterparty in the event of default.

Significant_Accounting_Policie4

Significant Accounting Policies Liabilities subject to offsetting provisions (Tables)	12 Months Ended
	Dec. 31, 2013
Offsetting Liabilities [Line Items]	'
Offsetting Liabilities [Table Text Block]	'
	Below is a summary of the Company's liabilities subject to offsetting provisions (in millions):
					Gross Amounts Not Offset in the Statement of Assets and Liabilities
	As of	Description	Net Amounts of Liabilities Presented in the Statement of Assets and Liabilities		Instruments Available for Offset		Collateral Pledged(1)		Net Amount(2)
	31-Dec-13	Derivative liabilities	$	29.1	$	9.2	$	19.8	$	—
	31-Dec-13	Repurchase agreements	11,207.00		—		11,207.00		—
	31-Dec-12	Derivative liabilities	98.6		34.1		64.5		—
	31-Dec-12	Repurchase agreements	13,981.30		—		13,981.30		—
	(1) Collateral consists of Agency RMBS, U.S. Treasuries and cash. Further detail of collateral pledged on repurchase agreements is disclosed in note 5. Excess of collateral pledged is not shown for financial reporting purposes.
	(2) Net amount represents the net amount payable from the counterparty in the event of default.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Schedule Of Computation Of Basic And Diluted Earnings Per Share	'
	Components of the computation of basic and diluted EPS under the two-class method were as follows (in thousands, except per share numbers):
		Year Ended December 31,
		2013			2012			2011
	Net income (loss)	$	(475,782	)	$	372,787		$	291,933
	Less dividend on preferred shares	(15,854		)	(2,405		)	—
	Net income (loss) available to common shares	(491,636		)	370,382			291,933
	Less dividends paid:
	Common shares	(221,957		)	(355,548		)	(184,383		)
	Unvested shares	(1,128		)	(1,640		)	(1,592		)
	Undistributed earnings (loss)	$	(714,721	)	$	13,194		$	105,958
	Basic weighted average shares outstanding:
	Common shares	169,967			139,651			78,992
	Basic earnings (loss) per common share:
	Distributed earnings	$	1.31		$	2.55		$	2.33
	Undistributed earnings	(4.21		)	0.09			1.33
	Basic earnings (loss) per common share	$	(2.90	)	$	2.64		$	3.66
	Diluted weighted average shares outstanding:
	Common shares	169,967			139,651			78,992
	Net effect of dilutive warrants (1)	—			—			1
		169,967			139,651			78,993
	Diluted earnings (loss) per common share:
	Distributed earnings	$	1.31		$	2.55		$	2.33
	Undistributed earnings	(4.21		)	0.09			1.33
	Diluted earnings (loss) per common share	$	(2.90	)	$	2.64		$	3.66
	__________________
	-1	For the year ended December 31, 2013, 2012 and 2011, the Company had an aggregate of 131 stock options outstanding with a weighted average exercise price of $30.00 that were not included in the calculation of EPS, as their inclusion would have been anti-dilutive. These instruments may have a dilutive impact on future EPS.

Investments_In_Securities_And_1

Investments In Securities And Interest Rate Swap And Cap Contracts (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative, Fair Value, Net [Abstract]	'
Assets And Liabilities Measured At Fair Value On A Recurring Basis	'
	The following tables provide a summary of the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2013 and 2012 (in thousands):
	31-Dec-13	Fair Value Measurements Using
	Assets	Level 1				Level 2				Level 3				Total
	Agency RMBS	$	—			$	13,858,848			$	—			$	13,858,848
	Other investments	—				—				6,945				6,945
	Derivative assets	—				295,707				—				295,707
	Total	$	—			$	14,154,555			$	6,945			$	14,161,500
	Liabilities
	Derivative liabilities	$	—			$	29,458			$	—			$	29,458
	31-Dec-12	Fair Value Measurements Using
	Assets	Level 1				Level 2				Level 3				Total
	Agency RMBS	$	—			$	20,804,143			$	—			$	20,804,143
	U.S. Treasury Bills	37,999				—				—				37,999
	Other investments	—				—				19,576				19,576
	Derivative assets	—				124,169				—				124,169
	Total	$	37,999			$	20,928,312			$	19,576			$	20,985,887
	Liabilities
	Derivative liabilities	$	—			$	98,575			$	—			$	98,575
Summary Of The Weighted Average Inputs To The Models	'
	The Company did not hold any CLOs as of December 31, 2013. The weighted average inputs to the models were:
			Constant Prepayment Rate			Default Rate			Recovery Rate			Recovery Lag
	31-Dec-12		20	%		2	%		69	%		6 Months
Schedule Of Fair Value Reconciliation, Level 3	'
	Level 3 Fair Value Reconciliation
		Year Ended December 31,
	(In thousands)	2013				2012
	Other investments
	Beginning balance level 3 assets	$	19,576			$	18,675
	Cash payments recorded as a reduction of cost basis	(324		)		(3,464		)
	Change in net unrealized appreciation (depreciation)	(6,721		)		3,364
	Net purchases (sales)	(12,005		)		(1,698		)
	Net gain (loss) on sales	6,419				2,699
	Transfers into (out of) level 3	—				—
	Ending balance level 3 assets	$	6,945			$	19,576
Agency RMBS Portfolio	'
	The Agency RMBS portfolio consisted of Agency RMBS as follows:
	December 31, 2013		Face Value				Fair Value				Weighted Average
	Asset Type		(in thousands)								Cost/Face				Fair Value/Face		MTR(1)	Coupon		CPR(2)
	15 Year Fixed Rate		$	6,337,536			$	6,510,958			$	102.58			$	102.74	N/A	3.13	%	5.3	%
	20 Year Fixed Rate		84,730				90,795				103.07				107.16		N/A	4.5	%	16	%
	30 Year Fixed Rate		5,145,151				5,214,548				102.15				101.35		N/A	3.78	%	3.6	%
	Hybrid ARMs		2,007,380				2,042,547				103.57				101.75		66.1	2.56	%	12.6	%
	Total/Weighted Average		$	13,574,797			$	13,858,848			$	102.57			$	102.09		3.3	%	6	%
	December 31, 2012		Face Value				Fair Value				Weighted Average
	Asset Type		(in thousands)								Cost/Face				Fair Value/Face		MTR(1)	Coupon		CPR(2)
	10 Year Fixed Rate		$	207,091			$	219,747			$	103.6			$	106.11	N/A	3.5	%	19.4	%
	15 Year Fixed Rate		11,092,374				11,717,136				104.32				105.63		N/A	3.05	%	16.1	%
	20 Year Fixed Rate		1,087,835				1,148,932				104.96				105.62		N/A	3.17	%	10.1	%
	30 Year Fixed Rate		3,571,692				3,817,488				105.78				106.88		N/A	3.59	%	8.9	%
	Hybrid ARMs		3,722,510				3,900,840				103.54				104.79		74.3	2.71	%	19.1	%
	Total/Weighted Average		$	19,681,502			$	20,804,143			$	104.47			$	105.7		3.1	%	15.8	%
	__________________
	(1)	MTR, or “Months to Reset” is the weighted average number of months remaining before the fixed rate on a hybrid ARM becomes a variable rate. At the end of the fixed period, the variable rate will be determined by the margin and the pre-specified caps of the ARM. After the fixed period, 100% of the hybrid ARMs in the portfolio reset annually.
	(2)	CPR, or “Constant Prepayment Rate,” is a method of expressing the prepayment rate for a mortgage pool that assumes that a constant fraction of the remaining principal is prepaid each month or year. Specifically, the CPR is an annualized version of the prior three month prepayment rate. Securities with no prepayment history are excluded from this calculation.
Summary Of Interest Rate Swap And Cap Contracts	'
	In order to mitigate its interest rate exposure, the Company enters into interest rate swap and cap contracts. The Company had the following activity in interest rate swap and cap transactions during the years ended December 31, 2013 and 2012 (in thousands):
	Year Ended December 31, 2013								Year Ended December 31, 2012
	Trade Date		Transaction		Notional				Trade Date		Transaction		Notional
	Feb-13		Opened		$	1,500,000			Apr-12		Opened		$	500,000
	Mar-13		Terminated		(500,000		)		May-12		Opened		600,000
	Mar-13		Opened		1,200,000				Jun-12		Opened		600,000
	Apr-13		Opened		500,000				Jul-12		Opened		2,250,000
	May-13		Opened		500,000				Sep-12		Opened		1,000,000
	May-13		Matured		(100,000		)		Nov-12		Opened		500,000
	Jun-13		Terminated		(700,000		)		Net Increase				$	5,450,000
	Jun-13		Matured		(300,000		)
	Jul-13		Matured		(300,000		)
	Aug-13		Terminated		(2,200,000		)
	Aug-13		Opened		500,000
	Nov-13		Terminated		(940,000		)
	Nov-13		Opened		500,000
	Dec-13		Terminated		(350,000		)
	Net Decrease				$	(690,000	)
Schedule Of Notional Amount And Fair Value Of Derivatives	'
	Below is a summary of our interest rate swap and cap contracts open as of December 31, 2013 and 2012 and the net gain (loss) on swap and cap contracts for the years ended December 31, 2013, 2012 and 2011 (in thousands):
	Derivatives not designated as hedging instruments under ASC 815(a)
	Interest Rate Swap Contracts	Notional Amount				Fair Value				Statement of Assets and Liabilities Location
	December 31, 2013	$	2,050,000			$	(29,458	)		Derivative liabilities, at fair value
	December 31, 2013	4,250,000				61,004				Derivative assets, at fair value
	31-Dec-12	6,490,000				(98,575		)		Derivative liabilities, at fair value
	December 31, 2012	1,000,000				1,180				Derivative assets, at fair value
	Interest Rate Cap Contracts	Notional Amount				Fair Value				Statement of Assets and Liabilities Location
	December 31, 2013	$	3,900,000			$	234,703			Derivative assets, at fair value
	December 31, 2012	3,400,000				122,989				Derivative assets, at fair value
				Amount of Gain or (Loss)
				Recognized in Income on Derivatives
	Derivatives Not Designated as Hedging Instruments Under ASC 815(a)	Location of Gain or (Loss) Recognized in Income on Derivative		Year Ended December 31,
				2013				2012				2011
	Interest rate swap and cap contracts	Net gain (loss) from swap and cap contracts		$	175,631			$	(82,766	)		$	(160,402	)
	__________________
	(a)	See Note 2 for additional information on the Company’s purpose for entering into interest rate swaps and caps and the decision not to designate them as hedging instruments.

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Short-term Debt [Abstract]	'
Schedule Of Company's Borrowings	'
	Certain information with respect to the Company’s borrowings is summarized in the following tables. Each of the borrowings listed is contractually due in one year or less (dollars in thousands).
	December 31, 2013
	Outstanding repurchase agreements	$	11,206,950
	Interest accrued thereon	$	7,204
	Weighted average borrowing rate	0.41		%
	Weighted average remaining maturity (in days)	39.9
	Fair value of the collateral(1)	$	11,760,720
	December 31, 2012
	Outstanding repurchase agreements	$	13,981,307
	Interest accrued thereon	$	11,717
	Weighted average borrowing rate	0.48		%
	Weighted average remaining maturity (in days)	19.6
	Fair value of the collateral(1)	$	14,693,645
	__________________
	-1	Collateral for repurchase agreements consisted of Agency RMBS and U.S. Treasury Securities.

Share_Capital_Tables

Share Capital (Tables)	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Common Stock Transactions	'
	The Company’s common and preferred stock transactions during the year ended December 31, 2013 and 2012 are as follows (in thousands):
		Year Ended December 31, 2013					Year Ended December 31, 2012
	Common stock	Shares		Amount			Shares		Amount
	Common shares sold in public offerings or issued as restricted common stock	365		$	3,279		92,113		$	1,238,801
	Shares issued in reinvestment of distributions	—		—			96		1,294
	Shares repurchased or canceled	(13,639	)	(116,095		)	(38	)	(453		)
	Net increase	(13,274	)	$	(112,816	)	92,171		$	1,239,642
	Series A Preferred stock
	Preferred shares sold in public offerings	—		$	—		3,000		$	72,369
	Series B Preferred stock
	Preferred shares sold in public offerings	8,000		$	193,531		—		$	—

Stock_Options_and_Restricted_S1

Stock Options and Restricted Stock (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]	'
	The following table summarizes restricted common stock transactions for the years ended December 31, 2013, 2012 and 2011:
	Years ended December 31, 2011, 2012 and 2013		Officers and Employees(1)		Directors			Total
	Unvested Restricted Common Stock as of December 31, 2010		754,001		22,356			776,357
	Granted (Weighted average grant date fair value $13.21)		150,000		34,446			184,446
	Canceled/Forfeited		(3,917	)	—			(3,917	)
	Vested		(355,414	)	(28,356	)		(383,770	)
	Unvested Restricted Common Stock as of December 31, 2011		544,670		28,446			573,116
	Granted (Weighted average grant date fair value $13.38)		181,618		31,668			213,286
	Canceled/Forfeited		(38,387	)	—			(38,387	)
	Vested		(113,781	)	(28,446	)		(142,227	)
	Unvested Restricted Common Stock as of December 31, 2012		574,120		31,668			605,788
	Granted (Weighted average grant date fair value $11.91)		319,979		44,765			364,744
	Canceled/Forfeited		(39,034	)	—			(39,034	)
	Vested		(135,438	)	(31,668	)		(167,106	)
	Unvested Restricted Common Stock as of December 31, 2013		719,627		44,765			764,392
	______________
	-1	Include grants to the Company’s executive officers and certain officers and employees of the Manager prior to Internalization.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	'
	The components of share based compensation expense for each period were as follows (in thousands):
			Year ended December 31,
			2013			2012				2011
	Restricted shares granted to officers and employees(1)		$	3,024		$	2,440			$	4,848
	Restricted shares granted to certain directors		447			394				415
	Total shared based compensation expense		$	3,471		$	2,834			$	5,263
	_________
	-1	Includes grants to employees of the Company’s manager prior to the Internalization.

Management_Agreement_and_Relat1

Management Agreement and Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions Disclosure [Text Block]	'
	MANAGEMENT AGREEMENT AND RELATED PARTY TRANSACTIONS
	On September 1, 2011, the Company acquired certain assets and entered into agreements to effect the Internalization. Prior to the Internalization, the Company had been managed by the Manager pursuant to the Management Agreement. The Manager had entered into sub-advisory agreements with Sharpridge and an affiliate of The Cypress Group, pursuant to which the Manager was provided with all of the resources and assets used to operate the Company’s business and manage the Company’s assets. In connection with the completion of the Internalization, the Management Agreement, sub-advisory agreements and other ancillary agreements related thereto were terminated. No termination fee was incurred or paid as a result of terminating those agreements.
	The Management Agreement provided, among other things, that the Company pay to the Manager, in exchange for managing the day-to-day operations of the Company, certain fees and reimbursements, consisting of a base management fee and reimbursement for out-of-pocket and certain other costs incurred by the Manager and on behalf of the Company. The base management fee, which was paid monthly, was equal to 1/12 of (A) 1.50% of the first $250,000,000 of Net Assets (as defined in the Management Agreement), (B) 1.25% of such Net Assets that are greater than $250,000,000 and less than or equal to $500,000,000, and (C) 1.00% of such Net Assets that are greater than $500,000,000. The Company was also required to reimburse the Manager for its pro-rata portion of rent, utilities, legal and investment services, market information systems and research publications and materials. In addition, the Company recognized share based compensation expense related to common stock options and restricted common stock granted to the Company’s executive officers and affiliates of the Manager, which is included in compensation and benefits on the statement of operations.
	For the year ended December 31, 2011 the Company incurred the following in base management fees and expense reimbursement (in thousands):
		Year ended December 31, 2011*
	Base Management Fees	$	7,835
	Expense Reimbursement	607
	Total	$	8,442
	________
	* Expenses were only incurred during the period from January 1, 2011 to August 31, 2011.

Income_Taxes_Federal_Tax_Cost_

Income Taxes (Federal Tax Cost and the Tax Basis Components) (Tables)	12 Months Ended
	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]	'
Summary of Operating Loss Carryforwards [Table Text Block]	'
	The estimated federal tax cost and the tax basis components of distributable earnings were as follows (in thousands):
	As of December 31, 2013
	Cost of investments	$	13,930,216
	Gross appreciation	$	58,432
	Gross depreciation	(122,855		)
	Net unrealized appreciation (depreciation)	$	(64,423	)
	Undistributed ordinary income	$	—
	Capital loss carryforwards	$	602,474
Summary of Tax Credit Carryforwards [Table Text Block]	'
	As of December 31, 2013, the Company's estimated capital loss carryforwards available to offset future realized gains are subject to current and future limitations in accordance with Internal Revenue Code section 382 and expire as follows (in thousands):
	31-Dec-14	$	48
	31-Dec-18	602,426
	Total	$	602,474

Contingencies_Rental_Payments_

Contingencies (Rental Payments) (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	Under this agreement, annual rental payments will be as follows throughout the term of the lease for the years ending December 31 (in thousands):
	2014	$	293
	2015	262
	2016	131
		$	686

Financial_Highlights_Tables

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2013
Financial Highlights [Abstract]	'
Summary Of Financial Highlight Information	'
	In accordance with financial reporting requirements applicable to investment companies, the Company has included below certain financial highlight information for the years ended December 31, 2013, 2012 and 2011:
		Per Common Share
		Year Ended December 31,
		2013			2012			2011
	Net asset value, beginning of period	$13.31			$13.02			$11.59
	Net income (loss):
	Net investment income	1.51		(a)	1.63		(a)	2.39		(a)
	Net gain (loss) from investments and swap and cap contracts	-4.3		(a)	1.03		(a)	1.27		(a)
	Net income (loss)	-2.79			2.66			3.66
	Dividends on preferred shares	-0.09		(a)	-0.02		(a)	0		(a)
	Net income (loss) available to common shares	-2.88			2.64			3.66
	Capital transactions:
	Distributions on common shares	-0.85			-2.37			-1.96
	Tax return of capital distributions	-0.47			0			-0.29
	Issuance/Repurchase of common and preferred stock and amortization of share based compensation	0.13		(a)	0.02		(a)	0.02		(a)
	Net decrease in net asset value from capital transactions	-1.19			-2.35			-2.23
	Net asset value, end of period	$9.24			$13.31			$13.02
	Net asset value total return (%)	(20.66	)%		20.43	%		31.75	%
	Market value total return (%) (b)	(27.36	)%		7.63	%		21.22	%
	Ratios to Average Net Assets
	Expenses before interest expense	0.98	%		1.05	%		2.34	%
	Total expenses	3.44	%		3.3	%		4.24	%
	Net investment income	12.04	%		11.66	%		19.3	%
	__________________
	(a)	Calculated based on average shares outstanding during the period. Average shares outstanding include vested and unvested restricted shares and differs from weighted average shares outstanding used in calculating EPS (see Note 3).
	(b)	Calculated based on the change in market value of the Company's common shares taking into account dividends reinvested in accordance with the terms of the DSPP.

Summary_of_Quarterly_Results_o1

Summary of Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Statement of Financial Position [Abstract]	'
Schedule of Quarterly Financial Information	'
		Three Months Ended
	(in thousands except per share numbers)	31-Dec-13			30-Sep-13			30-Jun-13			31-Mar-13
	Total investment income	$	91,743		$	85,636		$	81,551		$	73,101
	Total expenses	15,930			17,566			19,718			20,584
	Net investment income	75,813			68,070			61,833			52,517
	Net gain (loss) from investments	(190,321		)	15,781			(656,295		)	(78,811		)
	Net gain (loss) from swap and cap contracts	22,644			(53,280		)	196,176			10,091
	Net income (loss)	$	(91,864	)	$	30,571		$	(398,286	)	$	(16,203	)
	Dividend on preferred shares	(5,203		)	(5,203		)	(3,995		)	(1,453		)
	Net income (loss) available to common shares	$	(97,067	)	$	25,368		$	(402,281	)	$	(17,656	)
	Net income (loss) per common share basic & diluted	$	(0.59	)	$	0.14		$	(2.32	)	$	(0.10	)
		Three Months Ended
	(in thousands except per share numbers)	31-Dec-12			30-Sep-12			30-Jun-12			31-Mar-12
	Total investment income	$	79,579		$	76,631		$	71,747		$	65,369
	Total expenses	21,165			17,233			14,272			11,972
	Net investment income	58,414			59,398			57,475			53,397
	Net gain (loss) from investments	(95,994		)	221,127			68,586			33,150
	Net gain (loss) from swap and cap contracts	(2,363		)	(38,618		)	(24,356		)	(17,429		)
	Net income (loss)	$	(39,943	)	$	241,907		$	101,705		$	69,118
	Dividend on preferred shares	(1,452		)	(953		)	—			—
	Net income (loss) available to common shares	$	(41,395	)	$	240,954		$	101,705		$	69,118
	Net income (loss) per common share basic & diluted	$	(0.24	)	$	1.46		$	0.87		$	0.66

Organization_Organization_Deta

Organization Organization (Details) (USD $)	Dec. 31, 2013	Apr. 30, 2013	Dec. 31, 2012	Aug. 03, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'	'	'
Preferred Stock, Liquidation Preference Per Share	$25	$25	$25	$25
Series B Cumulative Redeemable Preferred Stock, liquidation preference per share	$25	'	$25	'

Significant_Accounting_Policie5

Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]	'	'
Derivative Asset, Current	$61,000,000	'
Derivative Liability, Current	29,500,000	'
NetDerivativeLiability	29,100,000	98,600,000
InstrumentsAvailableToOffsetDerivativeLiability	9,200,000	34,100,000
Derivative Liability, Fair Value of Collateral	19,800,000	64,500,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Repurchase agreements	11,206,950,000	13,981,307,000
InstrumentsAvailableToOffsetRepoLiability	0	0
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements	11,207,000,000	13,981,300,000
SecuritiesSoldUnderAgreementsNotOffsetAgainstCollateral	0	0
Derivative Asset, Fair Value, Gross Asset	284,500,000	124,200,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	9,200,000	34,100,000
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged	244,700,000	47,300,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	30,600,000	42,800,000
Percentage of REIT taxable income that must be distributed to stockholders	90.00%	'
Interest rate cap, asset position	234,700,000	'
Interest rate cap, liability position	0	'
Derivative Asset	295,707,000	124,169,000
Interest Rate Derivative Liabilities, at Fair Value	29,458,000	98,575,000
Derivative Asset, Not Subject to Master Netting Arrangement	11,200,000	'
Derivative Liability, Not Subject to Master Netting Arrangement	400,000	'
DerivativeAssetSubjectToMasterNettingArrangement	284,500,000	'
DerivativeLiabilitySubjectToMasterNettingArrangement	29,100,000	'
Agency RMBS [Member]	'	'
Significant Accounting Policies [Line Items]	'	'
Security Owned and Pledged as Collateral, Fair Value	$12,300,000	$10,400,000
Minimum [Member]	'	'
Significant Accounting Policies [Line Items]	'	'
Repurchase agreement period (in days)	30	'
Maximum [Member]	'	'
Significant Accounting Policies [Line Items]	'	'
Repurchase agreement period (in days)	90	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]

'

'

'

'

'

'

'

'

'

'

'

NET INCOME (LOSS)

($91,864)

$30,571

($398,286)

($16,203)

($39,943)

$241,907

$101,705

$69,118

($475,782)

$372,787

$291,933

DIVIDENDS ON PREFERRED SHARES

-5,203

-5,203

-3,995

-1,453

-1,452

-953

0

0

-15,854

-2,405

0

Net income (loss) available to common shares

-97,067

25,368

-402,281

-17,656

-41,395

240,954

101,705

69,118

-491,636

370,382

291,933

Common shares

'

'

'

'

'

'

'

'

-221,957

-355,548

-184,383

Unvested shares

'

'

'

'

'

'

'

'

1,128

1,640

1,592

Undistributed earnings (loss)

'

'

'

'

'

'

'

'

($714,721)

$13,194

$105,958

Common shares

'

'

'

'

'

'

'

'

169,967,000

139,651,000

78,992,000

Distributed earnings, basic

'

'

'

'

'

'

'

'

$1.31

$2.55

$2.33

Undistributed earnings

'

'

'

'

'

'

'

'

($4.21)

$0.09

$1.33

Basic earnings (loss) per common share

'

'

'

'

'

'

'

'

($2.90)

$2.64

$3.66

Net effect of dilutive warrants (1)

'

'

'

'

'

'

'

'

0

[1]

0

[1]

1,000

[1]

Diluted weighted average shares outstanding

'

'

'

'

'

'

'

'

169,967,000

139,651,000

78,993,000

Distributed earnings

'

'

'

'

'

'

'

'

$1.31

$2.55

$2.33

Undistributed earnings

'

'

'

'

'

'

'

'

($4.21)

$0.09

$1.33

Diluted earnings per common share

'

'

'

'

'

'

'

'

($2.90)

$2.64

$3.66

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options

131,088

'

'

'

131,088

'

'

'

131,088

131,088

131,088

Weighted average exercise price for stock options

$30

'

'

'

$30

'

'

'

$30

$30

$30

[1]

For the year ended DecemberB 31, 2013, 2012 and 2011, the Company had an aggregate of 131 stock options outstanding with a weighted average exercise price of $30.00 that were not included in the calculation of EPS, as their inclusion would have been anti-dilutive. These instruments may have a dilutive impact on future EPS.

Investments_In_Securities_And_2

Investments In Securities And Interest Rate Swap And Cap Contracts (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'	'
unobservable input capitalization rate min [Line Items]	3.00%	'	'
unobservable input capitalization rate ma [Line Items]	5.00%	'	'
Percentage of hybrid ARMs reset to variable rate	100.00%	'	'
Accretion (Amortization) of Discounts and Premiums, Investments	$115,413,000	$111,647,000	$43,895,000
Trading Securities Pledged as Collateral	63,000,000	127,600,000	'
Securities Received as Collateral	211,400,000	18,400,000	'
Obligation to Return Cash	37,900,000	28,900,000	'
Agency RMBS [Member]	'	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'	'
Unamortized premium on marketable securities	$351,500,000	$879,600,000	'
Debt Instrument, Maturity Date	30	'	'
Average final contractual maturity of Agency RMBS portfolio	'2036	'2033	'
Agency RMBS [Member] | Portion at Fair Value, Fair Value Disclosure [Member]	'	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'	'
Weighted Average, Fair Value/Par	$102.09	$105.70	'

Investments_In_Securities_And_3

Investments In Securities And Interest Rate Swap And Cap Contracts (Level Table)(Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	$14,161,500	$20,985,887
Agency RMBS [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	13,858,848	20,804,143
U.S. Treasury Bills [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	'	37,999
Other Investments [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	6,945	19,576
Interest Rate Swap [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Fair Value Disclosure Liabilities	29,458	98,575
Interest Rate Cap Contracts [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	295,707	124,169
Level 1 [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	0	37,999
Level 1 [Member] | Agency RMBS [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	0	0
Level 1 [Member] | U.S. Treasury Bills [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	'	37,999
Level 1 [Member] | Other Investments [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	0	0
Level 1 [Member] | Interest Rate Swap [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Fair Value Disclosure Liabilities	0	0
Level 1 [Member] | Interest Rate Cap Contracts [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	0	0
Level 2 [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	14,154,555	20,928,312
Level 2 [Member] | Agency RMBS [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	13,858,848	20,804,143
Level 2 [Member] | U.S. Treasury Bills [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	'	0
Level 2 [Member] | Other Investments [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	0	0
Level 2 [Member] | Interest Rate Swap [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Fair Value Disclosure Liabilities	29,458	98,575
Level 2 [Member] | Interest Rate Cap Contracts [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	295,707	124,169
Level 3 [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	6,945	19,576
Level 3 [Member] | Agency RMBS [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	0	0
Level 3 [Member] | U.S. Treasury Bills [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	'	0
Level 3 [Member] | Other Investments [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	6,945	19,576
Level 3 [Member] | Interest Rate Swap [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Fair Value Disclosure Liabilities	0	0
Level 3 [Member] | Interest Rate Cap Contracts [Member]	'	'
Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]	'	'
Assets, Fair Value Disclosure	$0	$0

Investments_In_Securities_And_4

Investments In Securities And Interest Rate Swap And Cap Contracts (Level 3 Inputs) (Details)	12 Months Ended
	Dec. 31, 2013
Derivative, Fair Value, Net [Abstract]	'
Weighted Average, Constant Prepayment Rate	20.00%
Weighted Average, Default Rate	2.00%
Weighted Average, Recovery Rate	69.00%
Weighted Average, Recovery Lag	'6B Months

Investments_In_Securities_And_5

Investments In Securities And Interest Rate Swap And Cap Contracts (Level 3 Reconciliation) (Details) (Other Investments [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Investments [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Beginning balance Level 3 assets	$19,576	$18,675
Cash payments recorded as a reduction of cost basis	-324	-3,464
Change in net unrealized appreciation (depreciation)	-6,721	3,364
Net purchases (sales)	-12,005	-1,698
Net gain (loss) on sales	6,419	2,699
Transfers into (out of) level 3	0	0
Ending balance Level 3 assets	$6,945	$19,576

Investments_In_Securities_And_6

Investments In Securities And Interest Rate Swap And Cap Contracts (Agency RMBS Portfolio) (Details) (USD $)

1 Months Ended

12 Months Ended

12 Months Ended

Feb. 28, 2014

Jan. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Agency RMBS [Member]

Carrying (Reported) Amount, Fair Value Disclosure [Member]

Carrying (Reported) Amount, Fair Value Disclosure [Member]

10 Year Fixed Rate [Member]

15 Year Fixed Rate [Member]

15 Year Fixed Rate [Member]

20 Year Fixed Rate [Member]

20 Year Fixed Rate [Member]

30 Year Fixed Rate [Member]

30 Year Fixed Rate [Member]

Hybrid ARMs [Member]

Hybrid ARMs [Member]

M

M

Investments In Securities And Interest Rate Swap And Cap Contracts [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

$13,574,797,000

$19,681,502,000

'

'

$207,091,000

$6,337,536,000

$11,092,374,000

$84,730,000

$1,087,835,000

$5,145,151,000

$3,571,692,000

$2,007,380,000

$3,722,510,000

Assets, Fair Value Disclosure

'

'

14,161,500,000

20,985,887,000

13,858,848,000

20,804,143,000

'

'

219,747,000

6,510,958,000

11,717,136,000

90,795,000

1,148,932,000

5,214,548,000

3,817,488,000

2,042,547,000

3,900,840,000

Weighted Average, Cost/Par

'

'

'

'

'

'

$102.57

$104.47

$103.60

$102.58

$104.32

$103.07

$104.96

$102.15

$105.78

$103.57

$103.54

Weighted Average, Fair Value/Par

'

'

'

'

'

'

'

'

$106.11

$102.74

$105.63

$107.16

$105.62

$101.35

$106.88

$101.75

$104.79

Weighted Average, MTR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

66.1

[1]

74.3

[1]

Weighted Average, Coupon

'

'

'

'

3.30%

3.10%

'

'

3.50%

3.13%

3.05%

4.50%

3.17%

3.78%

3.59%

2.56%

2.71%

Weighted Average, CPR

5.30%

5.90%

'

'

6.00%

[2]

15.80%

[2]

'

'

19.40%

[2]

5.30%

[2]

16.10%

[2]

16.00%

[2]

10.10%

[2]

3.60%

[2]

8.90%

[2]

12.60%

[2]

19.10%

[2]

[1]

MTR, or bMonths to Resetb is the weighted average number of months remaining before the fixed rate on a hybrid ARM becomes a variable rate. At the end of the fixed period, the variable rate will be determined by the margin and the pre-specified caps of the ARM. After the fixed period, 100% of the hybrid ARMs in the portfolio reset annually.

[2]

CPR, or bConstant Prepayment Rate,b is a method of expressing the prepayment rate for a mortgage pool that assumes that a constant fraction of the remaining principal is prepaid each month or year. Specifically, the CPR is an annualized version of the prior three month prepayment rate. Securities with no prepayment history are excluded from this calculation.

Investments_In_Securities_And_7

Investments In Securities And Interest Rate Swap And Cap Contracts (Swap Transaction) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
DerivativeNotionalTransactions	($690,000)	$5,450,000
February Two Thousand And Thirteen Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'February 2013	'
Derivative, Notional Amount	1,500,000	'
March Two Thousand And Thirteen Terminated Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'March 2013	'
Derivative, Notional Amount	-500,000	'
March Two Thousand And Thirteen Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'March 2013	'
Derivative, Notional Amount	1,200,000	'
April Two Thousand And Thirteen Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'April 2013	'
Derivative, Notional Amount	500,000	'
May Two Thousand And Thirteen Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'May 2013	'
Derivative, Notional Amount	500,000	'
May Two Thousand And Thirteen Matured Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'May 2013	'
Derivative, Notional Amount	-100,000	'
June Two Thousand And Thirteen Terminated Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'June 2013	'
Derivative, Notional Amount	-700,000	'
June Two Thousand And Thirteen Matured Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'June 2013	'
Derivative, Notional Amount	-300,000	'
July Two Thousand And Thirteen Matured Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'July 2013	'
Derivative, Notional Amount	-300,000	'
August Two Thousand And Thirteen Terminated Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'August 2013	'
Derivative, Notional Amount	-2,200,000	'
August Two Thousand And Thirteen Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'August 2013	'
Derivative, Notional Amount	500,000	'
November Two Thousand And Thirteen Terminated [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'November 2013	'
Derivative, Notional Amount	-940,000	'
November Two Thousand And Thirteen Opened [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'November 2013	'
Derivative, Notional Amount	500,000	'
December Two Thousand And Thirteen Terminated [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'December 2013	'
Derivative, Notional Amount	-350,000	'
April Two Thousand And Twelve Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'	'April 2012
Derivative, Notional Amount	'	500,000
May Two Thousand And Twelve Opened Type [Member] [Member] [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'	'May 2012
Derivative, Notional Amount	'	600,000
June Two Thousand And Twelve Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'	'June 2012
Derivative, Notional Amount	'	600,000
July Two Thousand And Twelve Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'	'July 2012
Derivative, Notional Amount	'	2,250,000
September Two Thousand And Twelve Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'	'September 2012
Derivative, Notional Amount	'	1,000,000
November Two Thousand And Twelve Opened Type [Member]	'	'
Summary Of Interest Rate Swap And Cap Contracts [Line Items]	'	'
Trade Date	'	'November 2012
Derivative, Notional Amount	'	$500,000

Investments_In_Securities_And_8

Investments In Securities And Interest Rate Swap And Cap Contracts (Swap Balance Sheet Location) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'		'
Derivative Asset, Fair Value, Gross Asset	$284,500		$124,200
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Assets, Total [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative, Notional Amount	4,250,000	[1]	1,000,000	[1]
Interest Rate Swap contracts, at Fair Value, Asset	61,004	[1]	1,180	[1]
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member] | Liabilities [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative, Notional Amount	2,050,000	[1]	6,490,000	[1]
Interest Rate Swap contracts, at Fair Value, Liability	-29,458	[1]	-98,575	[1]
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Cap Contracts [Member] | Assets, Total [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative, Notional Amount	3,900,000	[1]	3,400,000	[1]
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Cap Contracts [Member] | Assets [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Asset, Fair Value, Gross Asset	$234,703	[1]	$122,989	[1]
[1]	See Note 2 for additional information on the Companybs purpose for entering into interest rate swaps and caps and the decision not to designate them as hedging instruments.

Investments_In_Securities_And_9

Investments In Securities And Interest Rate Swap And Cap Contracts (Income Statement Location) (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Derivative Instruments, Gain (Loss) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net gain (loss) from swap and cap contracts

$22,644

($53,280)

$196,176

$10,091

($2,363)

($38,618)

($24,356)

($17,429)

$175,631

[1]

($82,766)

[1]

($160,402)

[1]

[1]

See Note 2 for additional information on the Companybs purpose for entering into interest rate swaps and caps and the decision not to designate them as hedging instruments.

Borrowings_Schedule_Of_Company

Borrowings (Schedule Of Company's Borrowings) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified	D		D
Short-term Debt [Abstract]	'		'
RepoPercentageofNetAssets	10.00%		'
Outstanding repurchase agreements	$11,206,950		$13,981,307
Interest accrued thereon	7,204		11,717
Weighted average borrowing rate	0.41%		0.48%
Weighted average remaining maturity (in days)	39.9		19.6
Fair value of the collateral	$11,760,720	[1]	$14,693,645	[1]
Number of repurchase agreements exceeding 10% of net assets	0		0
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]	10.00%		10.00%
[1]	Collateral for repurchase agreements consisted of Agency RMBS and U.S. Treasury Securities.

Share_Capital_Details

Share Capital (Details) (USD $)	12 Months Ended							12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2013	Aug. 03, 2012	Jul. 16, 2012	Feb. 01, 2012	Dec. 31, 2012	Jun. 07, 2011	Dec. 31, 2012	Dec. 31, 2013
								Equity Placement Program [Member]	Equity Placement Program [Member]	Dividend Reinvestment And Direct Stock Purchase Plan [Member]	Dividend Reinvestment And Direct Stock Purchase Plan [Member]
Schedule of Capitalization, Equity [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Common stock, shares authorized	500,000,000	500,000,000	'	'	'	'	'	'	'	'	'
Common stock, par value	$0.01	$0.01	'	'	'	'	'	'	'	'	'
Common Stock, Shares, Issued	161,650,114	174,924,149	'	'	'	'	'	'	'	'	'
Common Stock, Shares, Outstanding	161,650,114	174,924,149	'	'	'	'	'	'	'	'	'
Series A Cumulative Redeemable Preferred Stock, shares authorized	50,000,000	50,000,000	'	'	'	'	'	'	'	'	'
Preferred Stock, Par or Stated Value Per Share	$0.01	'	'	'	'	'	'	'	'	'	'
Preferred stock, shares outstanding	3,000,000	3,000,000	'	'	'	'	'	'	'	'	'
Preferred Stock A, Dividend Rate, Percentage	7.75%	'	'	'	'	'	'	'	'	'	'
Series A Cumulative Redeemable Preferred Stock, liquidation preference per share	$25	$25	'	$25	$25	'	'	'	'	'	'
Series B Cumulative Redeemable Preferred Stock, Value Issued	($193,531,000)	$0	'	($193,600,000)	'	'	'	'	'	'	'
Public offering, shares	'	'	'	'	'	46,000,000	28,750,000	'	'	'	'
Equity Issuance, Amount Per Share	'	'	'	'	'	13.7	13.28	'	'	'	'
Common Stock, Value, Issued	1,616,000	1,749,000	'	'	'	622,200,000	377,300,000	'	'	'	'
Series A Cumulative Redeemable Preferred Stock, shares issued	3,000,000	3,000,000	'	'	3,000,000	'	'	'	'	'	'
Preferred Stock, Value, Issued	72,369,000	72,369,000	'	'	0	'	'	'	'	'	'
Stock Issued During Period, Shares, Dividend Reinvestment Plan	0	96,000	'	'	'	'	'	'	'	5,300,000	'
Common stock issued under reinvestment plan, value	'	'	'	'	'	'	'	'	'	74,000,000	'
Shares available for issuance during period shares dividend reinvestment plan	'	'	'	'	'	'	'	'	'	'	4,100,000
Number Of Common Stock Available To Sell Under Sales Agreement	'	'	'	'	'	'	'	3,100,000	15,000,000	'	'
Proceeds from Issuance of Common Stock	-552,000	1,236,807,000	275,884,000	'	'	'	'	'	'	'	'
Series B Cumulative Redeemable Preferred Stock, shares issued	8,000,000	0	'	8,000,000	'	'	'	'	'	'	'
Preferred Stock B, Dividend Rate, Percentage	7.50%	'	'	'	'	'	'	'	'	'	'
Stock Issued During Period, Shares, New Issues	365,000	92,113,000	'	'	'	'	'	11,900,000	'	'	'
EquityPlacementProgram	'	164,300,000	'	'	'	'	'	'	'	'	'
Stock Repurchase Program, Authorized Amount	250,000,000	'	'	'	'	'	'	'	'	'	'
Stock Repurchased and Retired During Period, Shares	13,600,000	'	'	'	'	'	'	'	'	'	'
Treasury Stock Acquired, Average Cost Per Share	$8.49	'	'	'	'	'	'	'	'	'	'
Payments for Repurchase of Common Stock	$115,735,000	$0	$0	'	'	'	'	'	'	'	'

Share_Capital_Stockholders_equ

Share Capital Stockholders' equity note (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2013
Stockholders' Equity Note [Abstract]	'	'	'	'
Shares sold in public offerings or issued as restricted stock, Shares	365	92,113	'	'
Shares sold in public offerings or issued as restricted stock, Amount	$3,279	$1,238,801	'	'
Stock Issued During Period, Shares, Dividend Reinvestment Plan	0	96	'	'
Shares Issued in Reinvestment of Distributions, Value	0	-1,294	14	'
Shares Repurchased or Canceled (Shares)	-13,639	-38	'	'
Shares Repurchased or Canceled (Value)	-116,095	-453	'	'
Stock Issued During Period, Shares, Period Increase (Decrease)	-13,274	92,171	'	'
Increase in net assets from capital transactions	-112,816	1,239,642	'	'
Stock Issued During Period, Shares, Other	0	3,000	'	'
Proceeds from Issuance of Redeemable Preferred Stock	0	72,369	'	'
Stock issued during period Preferred B shares	8,000	0	'	'
Preferred shares sold in public offerings, Series B	193,531	0	'	'
Proceeds from issuance of preferred B	$193,531	$0	'	$193,600

Incentive_Compensation_Plan_De

Incentive Compensation Plan (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]	'	'	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$8	$7.10	'
IncentiveCompensation	7.3	8.5	2.5
Salaries, Wages and Officers' Compensation	4.1	4.6	0.5
Stock Issued During Period, Value, Restricted Stock Award, Gross	3.2	3.9	2
StockIssuedDuringPeriodValueRestrictedStockAwardGross3YearVest2011	'	'	0.1
StockIssuedDuringPeriodValueRestrictedStockAwardGross5YearVest2011	'	'	1.9
StockIssuedDuringPeriodValueRestrictedStockAwardGross3YearVest	2.9	3.7	'
StockIssuedDuringPeriodValueRestrictedStockAwardGross5YearVest	$0.30	$0.20	'
ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod3Year	'three	'three	'three
ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod5Year	'five	'five	'five

Stock_Options_and_Restricted_S2

Stock Options and Restricted Stock - Stock Incentive Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'		'		'		'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$11.91		$13.38		$13.21		'
Unvested Share Based Compesation Employees	719,627	[1]	574,120	[1]	544,670	[1]	754,001	[1]
Unvested Share Based Compensation Directors	44,765		31,668		28,446		22,356
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	764,392		605,788		573,116		776,357
StockIssuedDuringPeriodSharesShareBasedCompensationGrossEmployee	319,979	[1]	181,618	[1]	150,000	[1]	'
StockIssuedDuringPeriodSharesShareBasedCompensationGrossDirector	44,765		31,668		34,446		'
Stock Issued During Period, Shares, Share-based Compensation, Gross	364,744		213,286		184,446		'
SharesPaidForTaxWithholdingForShareBasedCompensationEmployee	39,034	[1]	38,387	[1]	3,917	[1]	'
SharesPaidForTaxWithholdingForShareBasedCompensationDirector	0		0		0		'
ShareBasedCompensationAwardVestedEmployee	-135,438	[1]	-113,781	[1]	-355,414	[1]	'
ShareBasedCompensationAwardVestedDirector	-31,668		-28,446		-28,356		'
Shares Paid for Tax Withholding for Share Based Compensation	-39,034		-38,387		-3,917		'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	-167,106		-142,227		-383,770		'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$0		$0		'		'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	8,500,000		'		'		'
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	8,474,198		'		'		'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	131,088		131,088		'		'
[1]	(1)Include grants to the Companybs executive officers and certain officers and employees of the Manager prior to Internalization.

Stock_Options_and_Restricted_S3

Stock Options and Restricted Stock - Restricted Stock Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'		'		'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$8,000,000		$7,100,000		'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	1,800,000		2,300,000		5,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	131,088		131,088		'
Weighted average exercise price for stock options	$30		$30		$30
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	8,500,000		'		'
ShareBasedCompensationOfficersandEmployees	3,024	[1]	2,440	[1]	4,848	[1]
ShareBasedCompensationDirectors	447		394		415
Restricted Stock or Unit Expense	$3,471		$2,834		$5,263
[1]	(1)Includes grants to employees of the Companybs manager prior to the Internalization.

Management_Agreement_and_Relat2

Management Agreement and Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013			Dec. 31, 2011
Related Party Transactions [Abstract]	'			'
Schedule of Related Party Transactions [Table Text Block]	'			'
	For the year ended December 31, 2011 the Company incurred the following in base management fees and expense reimbursement (in thousands):
		Year ended December 31, 2011*
	Base Management Fees	$	7,835
	Expense Reimbursement	607
	Total	$	8,442
	________
	* Expenses were only incurred during the period from January 1, 2011 to August 31, 2011.
ManagementFeeFractionOfNetAssetsPercentage	'1/12			'
PercentageOfNetAssets150bps	1.50%			'
NetAssetLessThan250M	$250,000,000			'
PercentageOfNetAssets125bps	1.25%			'
NetAssetGreaterThan250M	250,000,000			'
NetAssetLessThan500M	500,000,000			'
PercentageOfNetAssets100bps	1.00%			'
NetAssetGreaterThan500M	500,000,000			'
Base management fees	'			7,835,000	[1]
Expense reimbursement	'			607,000	[1]
Total	'			$8,442,000	[1]
[1]	* Expenses were only incurred during the period from January 1, 2011 to August 31, 2011.

Income_Taxes_Estimated_Capital

Income Taxes (Estimated Capital Loss Carryforwards) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013
Other Tax Carryforward [Line Items]	'
Percentage of REIT taxable income that must be distributed to stockholders	90.00%
Common Stock, Dividends, Per Share, Cash Paid	$1.32
Dividend on preferred stock - Series A	$1.94
Dividend on preferred stock - Series B	$0.86
OrdinaryIncomePerShareCommon	$0.85
Ordinary Income Per Share Preferred - Series A	$1.94
Ordinary Income Per Share Preferred - Series B	$0.86
ReturnOfCapitalPerShare	$0.47
Cost of investments	$13,930,216
Gross appreciation	58,432
Gross depreciation	-122,855
Net unrealized appreciation (depreciation)	-64,423
Undistributed ordinary income	0
Capital loss carryforwards	602,474
DeferredTaxAssetsCapitalLossCarryforwards2014	-48
Deferredtaxassetscapitallosscarryforwards2018	($602,426)

Contingencies_Details

Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]	'	'	'
Operating Leases, Rent Expense	$400,000	$400,000	$200,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	293	'	'
Operating Leases, Future Minimum Payments, Due in Two Years	262	'	'
Operating Leases, Future Minimum Payments, Due in Three Years	131	'	'
Operating Leases, Future Minimum Payments Due	686	'	'
Indemnification claims	$0	$0	'

Financial_Highlights_Summary_O

Financial Highlights (Summary Of Financial Highlight Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financial Highlights [Abstract]	'		'		'
Net asset value, beginning of period	$13.31		$13.02		$11.59
Net investment income	$1.51	[1]	$1.63	[1]	$2.39	[1]
Net gain from investments and swap and cap contracts	($4.30)	[1]	$1.03	[1]	$1.27	[1]
Net income	($2.79)		$2.66		$3.66
Preferred diviended per common share	($0.09)	[1]	($0.02)	[1]	$0	[1]
Net income available to common shares	($2.88)		$2.64		$3.66
Distributions to common shareholders	($0.85)		($2.37)		($1.96)
ReturnOfCapitalPerShare	($0.47)		$0		($0.29)
Issuance of common shares and amortization of share based compensation	$0.13	[1]	$0.02	[1]	$0.02	[1]
Net Increase Decrease In Net Asset Value From Capital Transactions Per Share	($1.19)		($2.35)		($2.23)
Net asset value, end of period	$9.24		$13.31		$13.02
Net asset value total return (%)	-20.66%		20.43%		31.75%
Market value total return (%)	-27.36%	[2]	7.63%	[2]	21.22%	[2]
Expenses before interest expense	0.98%		1.05%		2.34%
Total expenses	3.44%		3.30%		4.24%
Net investment income	12.04%		11.66%		19.30%
[1]	Calculated based on average shares outstanding during the period. Average shares outstanding include vested and unvested restricted shares and differs from weighted average shares outstanding used in calculating EPS (see Note 3).
[2]	Calculated based on the change in market value of the Company's common shares taking into account dividends reinvested in accordance with the terms of the DSPP.

Subsequent_Events_Details

Subsequent Events (Details)	1 Months Ended
	Feb. 28, 2014	Jan. 31, 2014
Subsequent Events [Abstract]	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	'	15,246
Weighted Average, CPR	5.30%	5.90%

Summary_of_Quarterly_Results_o2

Summary of Quarterly Results of Operations (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement of Financial Position [Abstract]	'	'	'	'	'	'	'	'	'		'		'
Total investment income	$91,743	$85,636	$81,551	$73,101	$79,579	$76,631	$71,747	$65,369	$332,031		$293,326		$232,897
Total expenses	15,930	17,566	19,718	20,584	21,165	17,233	14,272	11,972	73,798		64,642		41,978
Net investment income	75,813	68,070	61,833	52,517	58,414	59,398	57,475	53,397	258,233		228,684		190,919
Net gain (loss) from investments	-190,321	15,781	-656,295	-78,811	-95,994	221,127	68,586	33,150	-909,646		226,869		261,416
Net gain (loss) from swap and cap contracts	22,644	-53,280	196,176	10,091	-2,363	-38,618	-24,356	-17,429	175,631	[1]	-82,766	[1]	-160,402	[1]
NET INCOME (LOSS)	-91,864	30,571	-398,286	-16,203	-39,943	241,907	101,705	69,118	-475,782		372,787		291,933
DIVIDENDS ON PREFERRED SHARES	-5,203	-5,203	-3,995	-1,453	-1,452	-953	0	0	-15,854		-2,405		0
NET INCOME (LOSS) AVAILABLE TO COMMON SHARES	($97,067)	$25,368	($402,281)	($17,656)	($41,395)	$240,954	$101,705	$69,118	($491,636)		$370,382		$291,933
Net income (loss) per common share basic & diluted	($0.59)	$0.14	($2.32)	($0.10)	($0.24)	$1.46	$0.87	$0.66	($2.90)		$2.64		$3.66
[1]	See Note 2 for additional information on the Companybs purpose for entering into interest rate swaps and caps and the decision not to designate them as hedging instruments.