Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income	$ 25,190	$ 22,419
Interest expense	11,595	7,519
Net interest income	13,595	14,900
Gain on derivative instruments, net	38,354	175
Loss on sale of investments, net	(3,775)	(1,708)
Fair value adjustments, net	29	10
Other expense, net	(253)	(46)
General and administrative expenses:
Compensation and benefits	(1,962)	(2,245)
Other general and administrative	(1,681)	(2,035)
Net income	44,307	9,051
Preferred stock dividends	(2,940)	(2,435)
Net income to common shareholders	41,367	6,616
Other comprehensive income:
Unrealized (loss) gain on available-for-sale investments, net	(49,189)	18,368
Reclassification adjustment for loss on sale of investments, net	3,775	1,708
Reclassification adjustment for de-designated cash flow hedges	(48)	(99)
Total other comprehensive (loss) income	(45,462)	19,977
Comprehensive (loss) income to common shareholders	$ (4,095)	$ 26,593
Net income per common share-basic and diluted	$ 0.74	$ 0.13
Weighted average common shares-basic and diluted	55,871	49,176