Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income	$ 43,748	$ 25,922	$ 83,706	$ 51,112
Interest expense	30,813	14,175	57,089	25,770
Net interest income	12,935	11,747	26,617	25,342
(Loss) gain on derivative instruments, net	117,535	(20,667)	179,233	(59,021)
Loss on sale of investments, net	(10,360)	(12,444)	(10,360)	(16,219)
Fair value adjustments, net	(16)	27	(29)	56
Other operating income (expense), net	256	(339)	25	(592)
General and administrative expenses:
Compensation and benefits	(1,747)	(1,751)	(3,645)	(3,713)
Other general and administrative	(2,518)	(2,255)	(4,574)	(3,936)
Net (loss) income	(118,985)	15,652	(171,199)	59,959
Preferred stock dividends	(3,206)	(2,942)	(6,265)	(5,882)
Net (loss) income to common shareholders	(122,191)	12,710	(177,464)	54,077
Other comprehensive income:
Unrealized gain (loss) on available-for-sale investments, net	100,767	(22,156)	187,399	(71,345)
Reclassification adjustment for loss on sale of investments, net	10,360	12,444	10,360	16,219
Reclassification adjustment for de-designated cash flow hedges	0	(48)	(165)	(96)
Total other comprehensive income (loss)	111,127	(9,760)	197,594	(55,222)
Comprehensive (loss) income to common shareholders	$ (11,064)	$ 2,950	$ 20,130	$ (1,145)
Net (loss) income per common share-basic and diluted	$ (4.98)	$ 0.68	$ (7.49)	$ 2.89
Weighted average common shares-basic and diluted	24,541	18,765	23,681	18,695