CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Income	$ 312,668	$ 313,226	$ 313,504
Other Comprehensive Income/(Loss):
Reclassification adjustment for MBS sales included in net income	(36,922)	(37,207)	(34,948)
Reclassification adjustment for other-than-temporary impairments included in net income	(485)	(705)	0
Unrealized gain/(loss) on derivative hedging instruments, net	22,678	(10,337)	(44,292)
Reclassification of unrealized loss on de-designated derivative hedging instruments	0	0	447
Cumulative effect adjustment on adoption of revised accounting standard for repurchase agreement financing	0	4,537	0
Other Comprehensive Income/(Loss)	57,831	(238,602)	16,758
Comprehensive Income before preferred stock dividends	370,499	74,624	330,262
Dividends declared on preferred stock	(15,000)	(15,000)	(15,000)
Comprehensive Income Available to Common Stock and Participating Securities	355,499	59,624	315,262
Agency MBS
Other Comprehensive Income/(Loss):
Unrealized (loss)/gain on MBS, net	(9,322)	(51,332)	65,739
Non-Agency MBS
Other Comprehensive Income/(Loss):
Unrealized (loss)/gain on MBS, net	$ 81,882	$ (143,558)	$ 29,812