Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]
Net income (Loss)	$ 22,587	$ (7,162)
Other comprehensive income (loss):
Net unrealized gain (loss) on RMBS	1,416	7,652
Reclassification of net realized (gain) loss on RMBS in earnings	256	(320)
Other comprehensive income (loss)	1,672	7,332
Comprehensive income (loss)	24,259	170
Comprehensive income (loss) attributable to noncontrolling interests in Operating Partnership	440	2
Comprehensive income (loss) attributable to common stockholders	$ 23,819	$ 168