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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Fair Valued Investments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized gain (loss) on investment | Realized gain (loss) on investment
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Realized gain (loss) on investment | Realized gain (loss) on investment
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized appreciation (depreciation) on investments | $ 2,840 | $ 793
Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 957,649 | 860,019
Net realized gains (losses) on investments | 1,743 | 58
Net change in unrealized appreciation (depreciation) on investments | 1,222 | 709
Purchase of investments | 145,861 | 51,521
Proceeds from sales and repayments of investments | (60,247) | (15,871)
Interest and dividend income paid-in-kind | 2,049 | 637
Proceeds from loan origination fees | (1,131) | (537)
Accretion of loan origination fees | 556 | 413
Accretion of original issue discount | 116 | 113
Ending Balance | 1,047,818 | 897,062
Subordinated Debt | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 135,173 | 101,456
Net change in unrealized appreciation (depreciation) on investments | (75) | (1,565)
Purchase of investments | 12,500 | 2,182
Proceeds from sales and repayments of investments | (209) |
Interest and dividend income paid-in-kind | 1,102 | 314
Proceeds from loan origination fees | (156) | (25)
Accretion of loan origination fees | 50 | 22
Accretion of original issue discount | 2 | 2
Ending Balance | 148,387 | 102,386
First Lien Debt | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 578,140 | 456,105
Net change in unrealized appreciation (depreciation) on investments | 1,116 | 133
Purchase of investments | 96,142 | 40,980
Proceeds from sales and repayments of investments | (41,963) | (15,699)
Interest and dividend income paid-in-kind | 256 | 127
Proceeds from loan origination fees | (896) | (481)
Accretion of loan origination fees | 478 | 366
Accretion of original issue discount | 17 | 16
Ending Balance | 633,290 | 481,547
Second Lien Debt | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 119,561 | 182,948
Net change in unrealized appreciation (depreciation) on investments | 453 | 698
Purchase of investments | 28,850 | 5,000
Proceeds from sales and repayments of investments | (14,852) |
Interest and dividend income paid-in-kind | 691 | 196
Proceeds from loan origination fees | (79) | (31)
Accretion of loan origination fees | 28 | 25
Accretion of original issue discount | 97 | 95
Ending Balance | 134,749 | 188,931
Equity | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 120,007 | 117,431
Net realized gains (losses) on investments | 1,743 | 58
Net change in unrealized appreciation (depreciation) on investments | (1,456) | 1,165
Purchase of investments | 8,369 | 3,359
Proceeds from sales and repayments of investments | (3,222) | (172)
Ending Balance | 125,441 | 121,841
Warrant | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 4,768 | 2,079
Net change in unrealized appreciation (depreciation) on investments | 1,184 | 278
Proceeds from sales and repayments of investments | (1) |
Ending Balance | $ 5,951 | $ 2,357

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