CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (90,000)	$ (1,674,352)	$ 364,101
Other comprehensive income (loss):
Unrealized gain (loss) on mortgage-backed and credit risk transfer securities, net	756	(223,416)	83,965
Reclassification of unrealized (gain) loss on sale of mortgage-backed and credit risk transfer securities to gain (loss) on investments, net	0	13,940	9,072
Reclassification of unrealized loss on available-for-sale securities to (increase) decrease in provision for credit losses	0	1,768	0
Reclassification of amortization of net deferred (gain) loss on de-designated interest rate swaps to repurchase agreements interest expense	(22,000)	(23,794)	(23,729)
Currency translation adjustments on investment in unconsolidated venture	(75)	1,144	(1,158)
Total other comprehensive income (loss)	(21,319)	(230,358)	68,150
Comprehensive income (loss)	(111,319)	(1,904,710)	432,251
Less: Dividends to preferred stockholders	(37,795)	(44,426)	(44,426)
Less: Issuance and redemption costs of redeemed preferred stock	(4,682)	0	0
Comprehensive income (loss) attributable to common stockholders	$ (153,796)	$ (1,949,136)	$ 387,825