Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (11,613)	$ (12,683)	$ 9,615	$ (61,519)
Other comprehensive income (loss):
Net unrealized gain (loss) on RMBS	(1,021)	14,017	(18,276)	(11,157)
Reclassification of net realized (gain) loss on RMBS included in earnings	(983)	1,769	(3,077)	19,312
Other comprehensive income (loss)	(2,004)	15,786	(21,353)	8,155
Comprehensive income (loss)	(13,617)	3,103	(11,738)	(53,364)
Comprehensive income (loss) attributable to noncontrolling interests in Operating Partnership	(276)	66	(237)	(986)
Dividends on preferred stock	2,465	2,461	4,928	4,920
Comprehensive income (loss) attributable to common stockholders	$ (15,806)	$ 576	$ (16,429)	$ (57,298)