Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income	$ 23,103	$ 21,135	$ 70,378	$ 69,040
Interest expense	9,889	6,068	26,122	18,478
Net interest income	13,214	15,067	44,256	50,562
Gain (loss) on derivative instruments, net	5,993	2,409	(9,634)	(62,153)
Loss on sale of investments, net	(5,211)	0	(10,628)	(4,238)
Fair value adjustments, net	23	34	63	86
Other (loss) income, net	(109)	545	(150)	898
General and administrative expenses:
Compensation and benefits	(2,070)	(1,736)	(6,356)	(5,829)
Other general and administrative	(1,529)	(1,619)	(5,620)	(5,288)
Net income (loss)	10,311	14,700	11,931	(25,962)
Preferred stock dividends	(2,808)	(2,294)	(7,885)	(6,882)
Net income (loss) to common shareholders	7,503	12,406	4,046	(32,844)
Other comprehensive income:
Unrealized gain on available-for-sale investments, net	981	769	28,087	61,260
Reclassification adjustment for loss on sale of investments, net	5,211	0	10,628	4,238
Reclassification adjustment for de-designated cash flow hedges	(48)	(99)	(220)	(152)
Total other comprehensive income	6,144	670	38,495	65,346
Comprehensive income to common shareholders	$ 13,647	$ 13,076	$ 42,541	$ 32,502
Net income (loss) per common share-basic and diluted	$ 0.15	$ 0.25	$ 0.08	$ (0.67)
Weighted average common shares-basic and diluted	49,832	49,147	49,411	49,102