Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income	$ 26,925	$ 23,103	$ 78,037	$ 70,378
Interest expense	14,751	9,889	40,521	26,122
Net interest income	12,174	13,214	37,516	44,256
Gain (loss) on derivative instruments, net	19,499	5,993	78,520	(9,634)
Loss on sale of investments, net	(1,726)	(5,211)	(17,945)	(10,628)
Fair value adjustments, net	12	23	68	63
Other operating expense, net	(409)	(109)	(1,001)	(150)
General and administrative expenses:
Compensation and benefits	(1,712)	(2,070)	(5,425)	(6,356)
Other general and administrative	(2,252)	(1,529)	(6,188)	(5,620)
Net income (loss)	25,586	10,311	85,545	11,931
Preferred stock dividends	(2,956)	(2,808)	(8,838)	(7,885)
Net income (loss) to common shareholders	22,630	7,503	76,707	4,046
Other comprehensive income:
Unrealized (loss) gain on available-for-sale investments, net	(23,574)	981	(94,919)	28,087
Reclassification adjustment for loss on sale of investments, net	1,726	5,211	17,945	10,628
Reclassification adjustment for de-designated cash flow hedges	(66)	(48)	(162)	(220)
Total other comprehensive (loss) income	(21,914)	6,144	(77,136)	38,495
Comprehensive income (loss) to common shareholders	$ 716	$ 13,647	$ (429)	$ 42,541
Net income (loss) per common share-basic and diluted	$ 0.39	$ 0.15	$ 1.35	$ 0.08
Weighted average common shares-basic and diluted	57,727	49,832	56,638	49,411