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Investments - Summarized Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022		Sep. 30, 2021
Investment Holdings [Line Items]
Investment income	$ 19,009			$ 22,911			$ 50,997		$ 62,761
Net investment income	8,392	$ 5,522	$ 7,908	13,718	$ 11,710	$ 8,213	21,822	[1]	33,641	[1]
Net income	(4,205)			9,145			(8,580)	[1]	28,026	[1]
F3C Joint Venture
Investment Holdings [Line Items]
Investment income	2,542			1,620			6,938		4,919
Operating expenses	2			36			5		52
Net investment income	2,540			1,584			6,933		4,867
Unrealized appreciation on investments	(4,199)			(766)			(9,282)		564
Net income	$ (1,659)			$ 818			$ (2,349)		$ 5,431
[1] Refer to Note 9 "Stockholders' Equity" for additional information on changes in components of Stockholders' Equity

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