Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income	$ 15,714	$ 20,088	$ 43,000	$ 79,764
Interest expense	(1,320)	(3,375)	(4,228)	(30,327)
Net interest income	14,394	16,713	38,772	49,437
Realized gain on sale of investments, net	0	20,846	6,705	298,728
Loss on investments, net	(3,085)	194	(2,981)	154
Gain (loss) on derivative instruments, net	(9,603)	(7,974)	(64,463)	196,156
Other operating expense, net	(330)	(207)	(1,033)	(852)
General and administrative expenses:
Compensation and benefits	(2,977)	(2,402)	(9,306)	(7,301)
Other general and administrative	(3,572)	(2,393)	(8,417)	(6,926)
Net income	14,033	40,725	88,203	137,084
Preferred stock dividends	(1,923)	(3,252)	(6,405)	(10,346)
Preferred stock redemption charge	0	0	(2,987)	(3,914)
Net income to common shareholders	12,110	37,473	78,811	122,824
Other comprehensive income:
Unrealized (loss) gain on available-for-sale investments, net	(9,139)	27,844	(53,320)	213,651
Reclassification adjustment for realized gain on available-for-sale investments, net	0	(20,846)	(6,705)	(298,728)
Total other comprehensive (loss) income	(9,139)	6,998	(60,025)	(85,077)
Comprehensive income to common shareholders	$ 2,971	$ 44,471	$ 18,786	$ 37,747
Weighted Average Number of Shares Outstanding, Basic	34,924,449	23,141,270	31,258,711	23,054,042
Earnings Per Share, Basic	$ 0.35	$ 1.62	$ 2.52	$ 5.33
Earnings Per Share, Diluted	$ 0.35	$ 1.62	$ 2.51	$ 5.33
Weighted Average Number of Shares Outstanding, Diluted	35,089,508	23,141,270	31,423,770	23,054,042
Common Stock, Dividends, Per Share, Declared	$ 0.39	$ 0.39	$ 1.17	$ 1.27