CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified		Total	Common Stock, Par Value $.01:		Additional Paid-in Capital, in excess of Par:		Accumulated Deficit:	Accumulated Other Comprehensive Income/(Loss):	Series A Preferred Stock Preferred Stock [Member]	Series A Preferred Stock Additional Paid-in Capital, in excess of Par:	Series B Preferred Stock Preferred Stock [Member]	Series B Preferred Stock Additional Paid-in Capital, in excess of Par:
Balance at Dec. 31, 2010			$ 2,805		$ 2,184,493		$ (191,569)	$ 254,680	$ 38		$ 0
Balance (in shares) at Dec. 31, 2010			280,481,000						3,840,000		0
Increase (Decrease) in Stockholders' Equity
Redemption of Series A Preferred Stock									0	0
Redemption of Series A Preferred Stock (in shares)									0
Issuance of stock, net of expenses			756	[1]	607,047	[1]					0	0
Issuance of common stock, net of expenses (in shares)			75,631,000	[1]							0
Repurchase of shares of common stock	[1]		0		0
Repurchase of shares of common stock (in shares)	[1]		0
Shares issued for common stock option exercises					0
Equity-based compensation expense					4,385
Net income		316,414					316,414
Dividends declared on common stock							(358,104)
Dividends declared on preferred stock		(8,160)					(8,160)
Dividends attributable to DERs							(1,642)
Issuance costs of redeemed Preferred Stock							0
Change in unrealized (losses)/gains on MBS, net		(338,331)						(338,331)
Change in unrealized gains on derivative hedging instruments, net								24,948
Balance at Dec. 31, 2011		2,497,760	3,561		2,795,925		(243,061)	(58,703)	38		0
Balance (in shares) at Dec. 31, 2011			356,112,000						3,840,000		0
Increase (Decrease) in Stockholders' Equity
Redemption of Series A Preferred Stock									0	0
Redemption of Series A Preferred Stock (in shares)									0
Issuance of stock, net of expenses			30	[1]	15,432	[1]					0	0
Issuance of common stock, net of expenses (in shares)			2,966,000	[1]							0
Repurchase of shares of common stock	[1]		(16)		(12,156)
Repurchase of shares of common stock (in shares)	[1]		(1,532,000)
Shares issued for common stock option exercises					35
Equity-based compensation expense					6,488
Net income		306,839					306,839
Dividends declared on common stock							(314,553)
Dividends declared on preferred stock		(8,160)					(8,160)
Dividends attributable to DERs							(1,373)
Issuance costs of redeemed Preferred Stock							0
Change in unrealized (losses)/gains on MBS, net		769,317						769,317
Change in unrealized gains on derivative hedging instruments, net								51,363
Balance at Dec. 31, 2012		3,311,006	3,575		2,805,724		(260,308)	761,977	38		0
Balance (in shares) at Dec. 31, 2012			357,546,000						3,840,000		0
Increase (Decrease) in Stockholders' Equity
Redemption of Series A Preferred Stock									(38)	(92,015)
Redemption of Series A Preferred Stock (in shares)									(3,840,000)
Issuance of stock, net of expenses			97	[1]	77,528	[1]					80	193,236
Issuance of common stock, net of expenses (in shares)			9,855,000	[1]							8,000,000
Repurchase of shares of common stock	[1]		(21)		(16,260)
Repurchase of shares of common stock (in shares)	[1]		(2,276,000)
Shares issued for common stock option exercises					0
Equity-based compensation expense					4,156
Net income		302,709					302,709
Dividends declared on common stock							(594,318)
Dividends declared on preferred stock		(13,750)					(13,750)
Dividends attributable to DERs							(1,930)
Issuance costs of redeemed Preferred Stock							(3,947)
Change in unrealized (losses)/gains on MBS, net		(71,896)						(71,896)
Change in unrealized gains on derivative hedging instruments, net								47,614
Balance at Dec. 31, 2013		$ 3,142,251	$ 3,651		$ 2,972,369		$ (571,544)	$ 737,695	$ 0		$ 80
Balance (in shares) at Dec. 31, 2013			365,125,000						0		8,000,000

[1] For the year ended December 31, 2013, includes approximately $15.4 million (2,143,354 shares) repurchased through the Company’s publicly announced stock repurchase program and approximately $849,000 (132,276 shares) surrendered for tax purposes related to equity-based compensation awards. For the year ended December 31, 2012, includes approximately $9.7 million (1,240,291 shares) repurchased through the Company’s publicly announced stock repurchase program and approximately $2.5 million (291,803 shares) surrendered for tax purposes related to equity-based compensation awards.