CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Income		$ 313,226	$ 313,504	$ 302,709
Other Comprehensive (Loss)/Income:
Reclassification adjustment for MBS sales included in net income		(37,207)	(34,948)	(19,833)
Reclassification adjustment for other-than-temporary impairments included in net income		(705)	0	0
Unrealized (loss)/gain on derivative hedging instruments, net		(10,337)	(44,292)	47,614
Reclassification of unrealized loss on de-designated derivative hedging instruments		0	447	0
Cumulative effect adjustment on adoption of revised accounting standard for repurchase agreement financing		4,537	0	0
Other Comprehensive (Loss)/Income		(238,602)	16,758	(24,282)
Comprehensive Income before preferred stock dividends and issuance costs of redeemed preferred stock		74,624	330,262	278,427
Dividends declared on preferred stock		(15,000)	(15,000)	(13,750)
Issuance costs of redeemed preferred stock	[1]	0	0	(3,947)
Comprehensive Income Available to Common Stock and Participating Securities		59,624	315,262	260,730
Agency MBS
Other Comprehensive (Loss)/Income:
Unrealized (loss)/gain on MBS and CRT securities, net		(51,332)	65,739	(186,568)
Non-Agency MBS
Other Comprehensive (Loss)/Income:
Unrealized (loss)/gain on MBS and CRT securities, net		$ (143,558)	$ 29,812	$ 134,505

[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 13)