CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 71,328		$ 78,141		$ 224,152		$ 237,620
Other Comprehensive Income:
Unrealized gain/(loss) on Agency MBS, net	15,469		61,999		(152,302)		47,169
Unrealized gain on Non-Agency MBS, net	16,381		409,742		62,455		666,287
Reclassification adjustment for MBS sales included in net income	(15,158)		(3,130)		(17,398)		(5,529)
Reclassification adjustment for other-than-temporary impairments included in net income	0		0		0		1,200
Unrealized (loss)/gain on derivative hedging instruments, net	(19,934)		11,654		10,930		36,025
Other Comprehensive (Loss)/Income	(3,242)		480,265		(96,315)		745,152
Comprehensive income before preferred stock dividends and issuance costs of redeemed preferred stock	68,086		558,406		127,837		982,772
Dividends declared on preferred stock	(3,750)		(2,040)		(10,000)		(6,120)
Issuance costs of redeemed preferred stock	0	[1]	0	[1]	(3,947)	[1]	0	[1]
Comprehensive Income Available to Common Stock and Participating Securities	$ 64,336		$ 556,366		$ 113,890		$ 976,652

[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)