Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income	$ 170,168	$ 110,051	$ 94,502
Interest expense	114,111	59,574	36,178
Net interest income	56,057	50,477	58,324
(Loss) gain on derivative instruments, net	186,949	3,461	(3,044)
Loss on sale of investments, net	(5,755)	(23,373)	(11,530)
Fair value adjustments, net	(56)	52	75
Other operating income (expense), net	22	(1,567)	(201)
General and administrative expenses:
Compensation and benefits	(7,520)	(6,605)	(8,509)
Other general and administrative	(8,467)	(8,500)	(7,310)
Net (loss) income	(152,668)	7,023	33,893
Preferred stock dividends	(12,967)	(11,801)	(10,794)
Net (loss) income to common shareholders	(165,635)	(4,778)	23,099
Other comprehensive income:
Unrealized gain (loss) on available-for-sale investments, net	203,995	(50,218)	12,650
Reclassification adjustment for loss on sale of investments, net	5,755	23,373	11,530
Reclassification adjustment for de-designated cash flow hedges	(165)	(237)	(268)
Total other comprehensive income (loss)	209,585	(27,082)	23,912
Comprehensive income (loss) to common shareholders	$ 43,950	$ (31,860)	$ 47,011
Net (loss) income per common share-basic and diluted	$ (7.01)	$ (0.25)	$ 1.37
Weighted average common shares-basic and diluted	23,620	19,235	16,806