CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)
Net Income	$ 306,839	$ 316,414	$ 269,762
Other Comprehensive Income/(Loss):
Unrealized (loss)/gain on Agency MBS, net	(7,820)	61,149	(59,644)
Unrealized gain/(loss) on Non-Agency MBS, net	785,830	(381,410)	167,732
Reclassification adjustment for MBS sales included in net income	(7,493)	(7,500)	(41,459)
Reclassification adjustment for other-than-temporary impairments included in net income	(1,200)	(10,570)	(12,277)
Unrealized gain on derivative hedging instruments, net	51,363	24,948	13,321
Other Comprehensive Income/(Loss)	820,680	(313,383)	67,673
Comprehensive Income before preferred stock dividends	1,127,519	3,031	337,435
Dividends declared on preferred stock	(8,160)	(8,160)	(8,160)
Comprehensive Income/(Loss) Available to Common Stock and Participating Securities	$ 1,119,359	$ (5,129)	$ 329,275