Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income	$ 22,816	$ 24,527	$ 47,905	$ 48,626
Interest expense	6,100	5,542	12,410	10,913
Net interest income	16,716	18,985	35,495	37,713
(Loss) gain on derivative instruments, net	(16,297)	17,090	(64,561)	(8,233)
Loss on sale of investments, net	(297)	(1,491)	(4,238)	(183)
Fair value adjustments, net	28	20	51	59
Other income, net	290	612	353	645
General and administrative expenses:
Compensation and benefits	(1,875)	(2,351)	(4,093)	(4,467)
Other general and administrative	(1,796)	(2,403)	(3,669)	(4,544)
Net (loss) income	(3,231)	30,462	(40,662)	20,990
Preferred stock dividends	(2,294)	(2,294)	(4,588)	(4,588)
Net (loss) income to common shareholders	(5,525)	28,168	(45,250)	16,402
Other comprehensive income:
Change in net unrealized gain on available-for-sale investments	22,730	(42,027)	60,491	(18,722)
Reclassification adjustment for loss on sale of investments, net	297	1,491	4,238	183
Reclassification adjustment for de-designated cash flow hedges	(80)	857	(53)	1,914
Total other comprehensive income (loss)	22,947	(39,679)	64,676	(16,625)
Comprehensive income (loss) to common shareholders	$ 17,422	$ (11,511)	$ 19,426	$ (223)
Net (loss) income per common share-basic and diluted	$ (0.11)	$ 0.52	$ (0.92)	$ 0.30
Weighted average common shares-basic and diluted	49,119	54,574	49,080	54,687