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Investments - Summarized Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Investment income									$ 69,614	$ 80,086	$ 42,764
Net investment income	$ 7,068	$ 8,392	$ 5,522	$ 7,908	$ 8,363	$ 13,718	$ 11,711	$ 8,213	28,890	42,004	17,000
Net income	$ (12,416)	$ (4,205)	$ (8,433)	$ 4,058	$ (2,000)	$ 9,144	$ 10,844	$ 8,037	$ (20,996)	26,026	31,573
F3C Joint Venture
Investment Holdings [Line Items]
Investment income										7,274	5,006
Operating expenses										67	72
Net investment income										7,207	4,934
Unrealized appreciation on investments										2,577	(518)
Net income										$ 9,784	$ 4,416

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