CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 53,220	$ (5,976)	$ 147,252	$ (158,303)
Other comprehensive income (loss):
Unrealized gain (loss) on mortgage-backed and credit risk transfer securities, net	39,633	117,116	55,922	238,576
Reclassification of unrealized (gain) loss on sale of mortgage-backed and credit risk transfer securities to gain (loss) on investments, net	651	(1,037)	1,501	(11,581)
Reclassification of amortization of net deferred (gain) loss on de-designated interest rate swaps to repurchase agreements interest expense	(6,369)	3,238	(12,667)	16,162
Currency translation adjustments on investment in unconsolidated venture	139	274	(476)	225
Total other comprehensive income (loss)	34,054	119,591	44,280	243,382
Comprehensive income (loss)	87,274	113,615	191,532	85,079
Less: Comprehensive (income) loss attributable to non-controlling interest	(1,099)	(1,435)	(2,414)	(1,094)
Less: Dividends to preferred stockholders	(5,716)	(5,716)	(11,432)	(11,432)
Comprehensive income (loss) attributable to common stockholders	$ 80,459	$ 106,464	$ 177,686	$ 72,553