CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 78,141	$ 83,699	$ 237,620	$ 245,850
Other Comprehensive Income/(Loss):
Unrealized gain on Agency MBS, net	61,999	12,035	47,169	50,092
Unrealized gain/(loss) on Non-Agency MBS, net	409,742	(109,294)	666,287	(250,845)
Reclassification adjustment for MBS sales included in net income	(3,130)	(4,525)	(5,529)	(4,869)
Reclassification adjustment for other-than-temporary impairments included in net income		3,991	1,200	6,383
Unrealized gain/(loss) on derivative hedging instruments, net	11,654	(10,255)	36,025	4,483
Other Comprehensive Income/(Loss)	480,265	(108,048)	745,152	(194,756)
Comprehensive income/(loss) before preferred stock dividends	558,406	(24,349)	982,772	51,094
Dividends declared on preferred stock	(2,040)	(2,040)	(6,120)	(6,120)
Comprehensive Income/(Loss) Available to Common Stock and Participating Securities	$ 556,366	$ (26,389)	$ 976,652	$ 44,974