Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 147,326	$ (63,790)	$ 135,466	$ (128,569)
Other comprehensive income (loss):
Unrealized gain (loss) on mortgage-backed and credit risk transfer securities, net	(193,322)	244,615	(67,368)	406,312
Reclassification of unrealized (gain) loss on sale of mortgage-backed and credit risk transfer securities to gain (loss) on investments, net	(1,669)	20,766	(4,603)	32,484
Reclassification of amortization of net deferred losses on de-designated interest rate swaps to repurchase agreements interest expense	16,313	21,532	35,458	42,828
Total other comprehensive income (loss)	(178,678)	286,913	(36,513)	481,624
Comprehensive income (loss)	(31,352)	223,123	98,953	353,055
Less: Comprehensive income (loss) attributable to non-controlling interest	357	(2,553)	(1,133)	(4,036)
Less: Dividends to preferred stockholders	(5,716)	(2,712)	(11,432)	(5,425)
Comprehensive income (loss) attributable to common stockholders	$ (36,711)	$ 217,858	$ 86,388	$ 343,594