Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income (loss)	$ (2,951)	$ 27,499	$ (51,247)	$ 76,583
Other comprehensive income (loss):
Net unrealized gain (loss) on RMBS	15,826	(13,656)	73,343	(57,682)
Reclassification of net realized gain (loss) on RMBS included in earnings	(275)	428	(275)	5,430
Other comprehensive income (loss)	15,551	(13,228)	73,068	(52,252)
Comprehensive income	12,600	14,271	21,821	24,331
Comprehensive income attributable to noncontrolling interests in Operating Partnership	203	187	353	316
Dividends on preferred stock	2,459	1,372	6,893	3,902
Comprehensive income attributable to common stockholders	$ 9,938	$ 12,712	$ 14,575	$ 20,113