Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (43,496)	$ 37,773	$ 48,014
Other comprehensive income (loss):
Net unrealized gain (loss) on RMBS	80,716	(43,820)	2,948
Reclassification of net realized gain (loss) on RMBS included in earnings	(902)	8,362	503
Other comprehensive income (loss)	79,814	(35,458)	3,451
Comprehensive income	36,318	2,315	51,465
Comprehensive income attributable to noncontrolling interests in Operating Partnership	587	30	702
Dividends on preferred stock	9,353	5,297	1,833
Comprehensive income (loss) attributable to common stockholders	$ 26,378	$ (3,012)	$ 48,930