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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Net change in unrealized appreciation (depreciation) on investments | $ 1,593 | $ (36,403) | $ (4,505) | $ (42,882)
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 |  |  | 4,267 | 65,220
Net change in unrealized appreciation (depreciation) on investments |  |  | (143) | (67,774)
Purchase of investments |  |  | 204,049 | 267,950
Proceeds from sales and repayments of investments |  |  | (146,316) | (128,255)
Interest and dividend income paid-in-kind |  |  | 4,661 | 1,327
Proceeds from loan origination fees |  |  | (2,098) | (1,869)
Accretion of loan origination fees |  |  | 1,809 | 1,094
Accretion of original issue discount |  |  | 344 | 137
Ending Balance | 926,592 | 856,597 | 926,592 | 856,597
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 |  |  | (1,314) | 1,213
Purchase of investments |  |  | 29,041 | 44,469
Proceeds from sales and repayments of investments |  |  | (10,149) |
Interest and dividend income paid-in-kind |  |  | 2,343 | 273
Proceeds from loan origination fees |  |  | (541) | (300)
Accretion of loan origination fees |  |  | 140 | 40
Accretion of original issue discount |  |  | 5 |
Ending Balance | 120,981 | 81,759 | 120,981 | 81,759
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 |  |  | (1,576) | (1,281)
Purchase of investments |  |  | 135,283 | 166,279
Proceeds from sales and repayments of investments |  |  | (68,761) | (31,574)
Interest and dividend income paid-in-kind |  |  | 850 | 481
Proceeds from loan origination fees |  |  | (1,226) | (1,454)
Accretion of loan origination fees |  |  | 1,563 | 943
Accretion of original issue discount |  |  | 51 | 18
Ending Balance | 522,289 | 488,334 | 522,289 | 488,334
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 |  |  | 3,226 | (13,048)
Purchase of investments |  |  | 25,000 | 49,498
Proceeds from sales and repayments of investments |  |  | (48,607) | (18,731)
Interest and dividend income paid-in-kind |  |  | 1,468 | 573
Proceeds from loan origination fees |  |  | (331) | (115)
Accretion of loan origination fees |  |  | 106 | 111
Accretion of original issue discount |  |  | 288 | 119
Ending Balance | 154,765 | 177,222 | 154,765 | 177,222
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 |  |  | 13,600 | 65,220
Net change in unrealized appreciation (depreciation) on investments |  |  | (1,976) | (54,102)
Purchase of investments |  |  | 14,725 | 7,704
Proceeds from sales and repayments of investments |  |  | (18,799) | (77,950)
Ending Balance | 124,981 | 106,634 | 124,981 | 106,634
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 |  |  | 1,497 | (556)
Ending Balance | $ 3,576 | $ 2,648 | $ 3,576 | $ 2,648

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