Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income	$ 44,502	$ 26,925	$ 128,207	$ 78,037
Interest expense	31,256	14,751	88,345	40,521
Net interest income	13,246	12,174	39,862	37,516
(Loss) gain on derivative instruments, net	50,709	(19,499)	229,941	(78,520)
Gain (loss) on sale of investments, net	4,605	(1,726)	(5,755)	(17,945)
Fair value adjustments, net	(13)	12	(42)	68
Other operating income (expense), net	25	(409)	50	(1,001)
General and administrative expenses:
Compensation and benefits	(1,786)	(1,712)	(5,430)	(5,425)
Other general and administrative	(1,972)	(2,252)	(6,547)	(6,188)
Net (loss) income	(36,604)		(207,803)	85,545
Preferred stock dividends	(3,341)		(9,606)	(8,838)
Net (loss) income to common shareholders	(39,945)	22,630	(217,409)	76,707
Other comprehensive income:
Unrealized gain (loss) on available-for-sale investments, net	59,800	(23,574)	247,199	(94,919)
Reclassification adjustment for (gain) loss on sale of investments, net	(4,605)	1,726	5,755	17,945
Reclassification adjustment for de-designated cash flow hedges	0	(66)	(165)	(162)
Total other comprehensive income (loss)	55,195	(21,914)	252,789	(77,136)
Comprehensive income (loss) to common shareholders	$ 15,250	$ 716	$ 35,380	$ (429)
Net (loss) income per common share-basic and diluted	$ (1.65)	$ 1.18	$ (9.12)	$ 4.06
Weighted average common shares-basic and diluted	24,174	19,242	23,847	18,879