CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 78,726		$ 75,473		$ 154,914		$ 152,824
Other Comprehensive Income/(Loss):
Unrealized gain/(loss) on Agency MBS, net	43,094		(140,480)		60,937		(167,771)
Unrealized gain/(loss) on Non-Agency MBS, net	50,136		(98,282)		101,554		48,388
Reclassification adjustment for MBS sales included in net income	(6,748)		(3,254)		(9,699)		(4,554)
Unrealized (loss)/gain on derivative hedging instruments, net	(27,634)		18,548		(39,901)		30,864
Reclassification of unrealized loss on de-designated derivative hedging instruments	0		0		447		0
Other Comprehensive Income/(Loss)	58,848		(223,468)		113,338		(93,073)
Comprehensive income/(loss) before preferred stock dividends and issuance costs of redeemed preferred stock	137,574		(147,995)		268,252		59,751
Dividends declared on preferred stock	(3,750)		(4,210)		(7,500)		(6,250)
Issuance costs of redeemed preferred stock	0	[1]	(3,947)	[1]	0	[1]	(3,947)	[1]
Comprehensive Income/(Loss) Available to Common Stock and Participating Securities	$ 133,824		$ (156,152)		$ 260,752		$ 49,554

[1] Issuance costs of redeemed preferred stock represent the original offering costs related to the Series A Preferred Stock, which was redeemed on May 16, 2013. (See Note 11)