Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income	$ 24,856	$ 22,816	$ 47,275	$ 47,905
Interest expense	8,714	6,100	16,233	12,410
Net interest income	16,142	16,716	31,042	35,495
Loss on derivative instruments, net	(15,802)	(16,297)	(15,627)	(64,561)
Loss on sale of investments, net	(3,709)	(297)	(5,417)	(4,238)
Fair value adjustments, net	30	28	40	51
Other income (loss), net	4	290	(42)	353
General and administrative expenses:
Compensation and benefits	(2,041)	(1,875)	(4,286)	(4,093)
Other general and administrative	(2,056)	(1,796)	(4,091)	(3,669)
Net (loss) income	(7,432)	(3,231)	1,619	(40,662)
Preferred stock dividends	(2,641)	(2,294)	(5,077)	(4,588)
Net loss to common shareholders	(10,073)	(5,525)	(3,458)	(45,250)
Other comprehensive income:
Unrealized gain on available-for-sale investments, net	8,739	22,730	27,107	60,491
Reclassification adjustment for loss on sale of investments, net	3,709	297	5,417	4,238
Reclassification adjustment for de-designated cash flow hedges	(73)	(80)	(172)	(53)
Total other comprehensive income	12,375	22,947	32,352	64,676
Comprehensive income to common shareholders	$ 2,302	$ 17,422	$ 28,894	$ 19,426
Net loss per common share-basic and diluted	$ (0.20)	$ (0.11)	$ (0.07)	$ (0.92)
Weighted average common shares-basic and diluted	49,218	49,119	49,197	49,080