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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Fair Valued Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
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] | Net Change In Unrealized (appreciation) Depreciation on Investments | Net Change In Unrealized (appreciation) Depreciation on Investments
Transfers in/(out) of Level 3 | $ 0 | $ 1
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net change in unrealized appreciation (depreciation) on investments | (28,524) | 46,340
Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 718,767 | 742,869
Net realized gains (losses) on investments | 65,635 | 55,808
Net change in unrealized appreciation (depreciation) on investments | (65,655) | 41,496
Purchase of investments | 333,846 | 346,737
Proceeds from sales and repayments of investments | (193,980) | (472,782)
Interest and dividend income paid-in-kind | 1,663 | 4,399
Proceeds from loan origination fees | (2,124) | (2,670)
Accretion of loan origination fees | 1,625 | 2,512
Accretion of original issue discount | 242 | 755
Transfers in/(out) of Level 3 |  | (357)
Ending Balance | 860,019 | 718,767
Subordinated Debt | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 36,064 | 107,911
Net realized gains (losses) on investments | 0 |
Net change in unrealized appreciation (depreciation) on investments | 753 | (499)
Purchase of investments | 66,516 | 16,500
Proceeds from sales and repayments of investments | (2,000) | (88,384)
Interest and dividend income paid-in-kind | 415 | 92
Proceeds from loan origination fees | (350) | (135)
Accretion of loan origination fees | 58 | 579
Accretion of original issue discount | 0 | 0
Transfers in/(out) of Level 3 |  | 0
Ending Balance | 101,456 | 36,064
First Lien Debt | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 354,922 | 187,353
Net realized gains (losses) on investments | (1,717) |
Net change in unrealized appreciation (depreciation) on investments | 904 | (1,152)
Purchase of investments | 189,149 | 244,596
Proceeds from sales and repayments of investments | (87,622) | (75,124)
Interest and dividend income paid-in-kind | 597 | 292
Proceeds from loan origination fees | (1,566) | (2,322)
Accretion of loan origination fees | 1,412 | 1,279
Accretion of original issue discount | 26 | 0
Transfers in/(out) of Level 3 |  | 0
Ending Balance | 456,105 | 354,922
Second Lien Debt | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 158,815 | 332,154
Net realized gains (losses) on investments | 0 |
Net change in unrealized appreciation (depreciation) on investments | (20,948) | 35
Purchase of investments | 67,998 | 72,181
Proceeds from sales and repayments of investments | (23,731) | (250,662)
Interest and dividend income paid-in-kind | 651 | 3,911
Proceeds from loan origination fees | (208) | (213)
Accretion of loan origination fees | 155 | 654
Accretion of original issue discount | 216 | 755
Transfers in/(out) of Level 3 |  | 0
Ending Balance | 182,948 | 158,815
Equity | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 165,762 | 112,836
Net realized gains (losses) on investments | 65,817 | 55,779
Net change in unrealized appreciation (depreciation) on investments | (45,610) | 42,652
Purchase of investments | 10,183 | 13,331
Proceeds from sales and repayments of investments | (78,721) | (58,583)
Interest and dividend income paid-in-kind | 0 | 104
Proceeds from loan origination fees | 0 | 0
Accretion of loan origination fees | 0 | 0
Accretion of original issue discount | 0 | 0
Transfers in/(out) of Level 3 |  | (357)
Ending Balance | 117,431 | 165,762
Warrant | Level 3 | Fair Value, Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 3,204 | 2,615
Net realized gains (losses) on investments | 1,535 | 29
Net change in unrealized appreciation (depreciation) on investments | (754) | 460
Purchase of investments | 0 | 129
Proceeds from sales and repayments of investments | (1,906) | (29)
Interest and dividend income paid-in-kind | 0 | 0
Proceeds from loan origination fees | 0 | 0
Accretion of loan origination fees | 0 | 0
Accretion of original issue discount | 0 | 0
Transfers in/(out) of Level 3 |  | 0
Ending Balance | $ 2,079 | $ 3,204

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