Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest income	$ 13,393	$ 19,853	$ 27,285	$ 59,676
Interest expense	(1,275)	(4,850)	(2,908)	(26,952)
Net interest income	12,118	15,003	24,377	32,724
Realized gain on sale of investments, net	2,008	193,099	6,705	277,882
Loss on investments, net	1,084	332	104	(40)
(Loss) gain on derivative instruments, net	52,940	8,563	(54,861)	204,130
Other operating expense, net	(323)	(222)	(703)	(645)
General and administrative expenses:
Compensation and benefits	(3,233)	(2,736)	(6,329)	(4,898)
Other general and administrative	(2,473)	(2,075)	(4,845)	(4,534)
Net (loss) income	(43,759)	194,838	74,170	96,359
Preferred stock dividends	(1,923)	(3,253)	(4,482)	(7,094)
Preferred stock redemption charge	0	0	(2,987)	(3,914)
Net (loss) income to common shareholders	(45,682)	191,585	66,701	85,351
Other comprehensive income:
Unrealized gain (loss) on available-for-sale investments, net	16,278	28,052	(44,181)	185,807
Reclassification adjustment for realized gain on available-for-sale investments, net	(2,008)	(193,099)	(6,705)	(277,882)
Total other comprehensive income (loss)	14,270	(165,047)	(50,886)	(92,075)
Comprehensive (loss) income to common shareholders	$ (31,412)	$ 26,538	$ 15,815	$ (6,724)
Weighted Average Number of Shares Outstanding, Basic	31,973,587	23,056,812	29,395,463	23,009,948
Earnings Per Share, Basic	$ (1.43)	$ 8.31	$ 2.27	$ 3.71
Earnings Per Share, Diluted	$ (1.43)	$ 8.31	$ 2.26	$ 3.71
Weighted Average Number of Shares Outstanding, Diluted	31,973,587	23,056,812	29,560,522	23,009,948
Common Stock, Dividends, Per Share, Declared	$ 0.39	$ 0.43	$ 0.78	$ 0.88