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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Fair Valued Investments (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net change in unrealized appreciation (depreciation) on investments	$ (5,885)	$ (5,656)	$ (6,345)	$ (2,974)
Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			860,019	718,767
Net realized gains (losses) on investments			(5,483)	25,176
Net change in unrealized appreciation (depreciation) on investments			1,914	(26,500)
Purchase of investments			147,348	160,098
Proceeds from sales and repayments of investments			(76,456)	(68,008)
Interest and dividend income paid-in-kind			1,872	914
Proceeds from loan origination fees			(1,762)	(1,023)
Accretion of loan origination fees			775	711
Accretion of original issue discount			228	60
Ending Balance	928,455	810,195	928,455	810,195
Subordinated Debt | Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			101,456	36,064
Net change in unrealized appreciation (depreciation) on investments			(842)	54
Purchase of investments			23,682	32,471
Interest and dividend income paid-in-kind			812	139
Proceeds from loan origination fees			(508)	(239)
Accretion of loan origination fees			54	19
Accretion of original issue discount			3
Ending Balance	124,657	68,508	124,657	68,508
First Lien Debt | Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			456,105	354,922
Net change in unrealized appreciation (depreciation) on investments			(76)	379
Purchase of investments			92,162	91,247
Proceeds from sales and repayments of investments			(26,264)	(14,312)
Interest and dividend income paid-in-kind			237	366
Proceeds from loan origination fees			(923)	(669)
Accretion of loan origination fees			653	606
Accretion of original issue discount			34	10
Ending Balance	521,928	432,549	521,928	432,549
Second Lien Debt | Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			182,948	158,815
Net realized gains (losses) on investments			(9,333)
Net change in unrealized appreciation (depreciation) on investments			4,737	(3,862)
Purchase of investments			25,000	31,895
Proceeds from sales and repayments of investments			(42,413)	(18,731)
Interest and dividend income paid-in-kind			823	409
Proceeds from loan origination fees			(331)	(115)
Accretion of loan origination fees			68	86
Accretion of original issue discount			191	50
Ending Balance	161,690	168,547	161,690	168,547
Equity | Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			117,431	165,762
Net realized gains (losses) on investments			3,850	25,176
Net change in unrealized appreciation (depreciation) on investments			(2,529)	(23,048)
Purchase of investments			6,504	4,485
Proceeds from sales and repayments of investments			(7,779)	(34,965)
Ending Balance	117,477	137,410	117,477	137,410
Warrant | Fair Value, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			2,079	3,204
Net change in unrealized appreciation (depreciation) on investments			624	(23)
Ending Balance	$ 2,703	$ 3,181	$ 2,703	$ 3,181

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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