Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income	$ 60,051	$ 96,468	$ 170,168
Interest expense	(5,671)	(32,615)	(114,111)
Net interest income	54,380	63,853	56,057
Realized gain (loss) on sale of investments, net	6,705	308,084	(5,755)
Unrealized (loss) gain on investments, net	(14,814)	20	(56)
Gain (loss) on derivative instruments, net	(81,417)	172,290	186,949
Other operating (expense) income, net	(1,342)	(1,057)	22
General and administrative expenses:
Compensation and benefits	(12,757)	(11,743)	(7,520)
Other general and administrative	(11,328)	(9,337)	(8,467)
Net income (loss)	102,261	177,530	(152,668)
Preferred stock dividends	(8,329)	(13,599)	(12,967)
Preferred stock redemption charge	(2,987)	(3,914)	0
Net income (loss) to common shareholders	90,945	160,017	(165,635)
Other comprehensive income:
Unrealized (loss) gain on available-for-sale investments, net	(66,827)	214,539	203,995
Reclassification adjustment for realized (gain) loss on available-for-sale investments, net	(6,705)	(308,084)	5,755
Reclassification adjustment for de-designated cash flow hedges	0	0	(165)
Total other comprehensive (loss) income	(73,532)	(93,545)	209,585
Comprehensive income to common shareholders	$ 17,413	$ 66,472	$ 43,950
Weighted average common shares-basic (in shares)	32,596,272	23,106,200	23,620,125
Weighted average common shares-diluted (in shares)	32,761,331	23,106,200	23,620,125
Net income (loss) per common share-basic (in dollars per share)	$ 2.79	$ 6.93	$ (7.01)
Net income (loss) per common share-diluted (in dollars per share)	$ 2.78	$ 6.93	$ (7.01)