CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 75,473		$ 74,766		$ 152,824		$ 159,479
Other Comprehensive Income:
Unrealized loss on Agency MBS, net	(140,480)		(11,170)		(167,771)		(14,328)
Unrealized (loss)/gain on Non-Agency MBS, net	(98,282)		(6,057)		48,388		256,545
Reclassification adjustment for MBS sales included in net income	(3,254)		0		(4,554)		(2,901)
Reclassification adjustment for other-than-temporary impairments included in net income	0		280		0		1,200
Unrealized gain on derivative hedging instruments, net	18,548		12,280		30,864		24,371
Other Comprehensive (Loss)/Income	(223,468)		(4,667)		(93,073)		264,887
Comprehensive (loss)/income before preferred stock dividends and issuance costs of redeemed preferred stock	(147,995)		70,099		59,751		424,366
Dividends declared on preferred stock	(4,210)		(2,040)		(6,250)		(4,080)
Issuance costs of redeemed preferred stock	(3,947)	[1]	0	[1]	(3,947)	[1]	0	[1]
Comprehensive (Loss)/Income Available to Common Stock and Participating Securities	$ (156,152)		$ 68,059		$ 49,554		$ 420,286

[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)