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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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