CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 53,249	$ 94,032
Other comprehensive income (loss):
Unrealized gain (loss) on mortgage-backed and credit risk transfer securities, net	(132,317)	16,289
Reclassification of unrealized (gain) loss on sale of mortgage-backed and credit risk transfer securities to gain (loss) on investments, net	9,237	850
Reclassification of amortization of net deferred (gain) loss on de-designated interest rate swaps to repurchase agreements interest expense	(6,539)	(6,298)
Currency translation adjustments on investment in unconsolidated venture	312	(615)
Total other comprehensive income (loss)	(129,307)	10,226
Comprehensive income (loss)	(76,058)	104,258
Less: Comprehensive (income) loss attributable to non-controlling interest	959	(1,315)
Less: Dividends to preferred stockholders	(11,107)	(5,716)
Comprehensive income (loss) attributable to common stockholders	$ (86,206)	$ 97,227