Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]
Net income (loss)	$ (27,158)	$ 13,845	$ (48,296)	$ 49,084
Other comprehensive income (loss):
Net unrealized gain (loss) on RMBS	25,536	(8,102)	57,517	(44,026)
Reclassification of net realized gain on RMBS included in earnings	0	121	0	5,002
Other comprehensive income (loss)	25,536	(7,981)	57,517	(39,024)
Comprehensive income (loss)	(1,622)	5,864	9,221	10,060
Comprehensive income (loss) attributable to noncontrolling interests in Operating Partnership	(29)	75	150	129
Dividends on preferred stock	2,593	1,317	4,434	2,530
Comprehensive income (loss) attributable to common stockholders	$ (4,186)	$ 4,472	$ 4,637	$ 7,401