CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net Income	$ 302,709		$ 306,839		$ 316,414
Other Comprehensive Income/(Loss):
Unrealized (loss)/gain on Agency MBS, net	(186,568)		(7,820)		61,149
Unrealized gain/(loss) on Non-Agency MBS, net	134,505		785,830		(381,410)
Reclassification adjustment for MBS sales included in net income	(19,833)		(7,493)		(7,500)
Reclassification adjustment for other-than-temporary impairments included in net income	0		(1,200)		(10,570)
Unrealized gain on derivative hedging instruments, net	47,614		51,363		24,948
Other Comprehensive (Loss)/Income	(24,282)		820,680		(313,383)
Comprehensive Income before preferred stock dividends and issuance costs of redeemed preferred stock	278,427		1,127,519		3,031
Dividends declared on preferred stock	(13,750)		(8,160)		(8,160)
Issuance costs of redeemed preferred stock	(3,947)	[1]	0	[1]	0	[1]
Comprehensive Income/(Loss) Available to Common Stock and Participating Securities	$ 260,730		$ 1,119,359		$ (5,129)

[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)