Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income	$ 21,135	$ 26,096	$ 69,040	$ 74,722
Interest expense	6,068	5,859	18,478	16,772
Net interest income	15,067	20,237	50,562	57,950
Gain (loss) on derivative instruments, net	2,409	(52,749)	(62,153)	(60,982)
Gain (loss) on sale of investments, net	0	113	(4,238)	(70)
Fair value adjustments, net	34	16	86	75
Other income (expense), net	545	(215)	898	430
General and administrative expenses:
Compensation and benefits	(1,736)	(2,327)	(5,829)	(6,794)
Other general and administrative	(1,619)	(2,052)	(5,288)	(6,596)
Net income (loss)	14,700	(36,977)	(25,962)	(15,987)
Preferred stock dividends	(2,294)	(2,294)	(6,882)	(6,882)
Net income (loss) to common shareholders	12,406	(39,271)	(32,844)	(22,869)
Other comprehensive income:
Change in net unrealized gain on available-for-sale investments	769	26,674	61,260	7,951
Reclassification adjustment for (gain) loss on sale of investments, net	0	(113)	4,238	70
Reclassification adjustment for de-designated cash flow hedges	(99)	857	(152)	2,772
Total other comprehensive income	670	27,418	65,346	10,793
Comprehensive income (loss) to common shareholders	$ 13,076	$ (11,853)	$ 32,502	$ (12,076)
Net income (loss) per common share-basic and diluted	$ 0.25	$ (0.74)	$ (0.67)	$ (0.42)
Weighted average common shares-basic and diluted	49,147	52,777	49,102	54,043