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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, 2025
Mar. 31, 2024
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 $ (6,416) $ 2,840
Level 3 | Fair Value, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,090,506 957,649
Net realized gains (losses) on investments 13,330 1,743
Net change in unrealized appreciation (depreciation) on investments (9,793) 1,222
Purchase of investments 115,555 145,861
Proceeds from sales and repayments of investments (57,343) (60,247)
Interest and dividend income paid-in-kind 2,239 2,049
Proceeds from loan origination fees (677) (1,131)
Accretion of loan origination fees 548 556
Accretion of original issue discount 43 116
Ending Balance 1,154,408 1,047,818
Subordinated Debt | Level 3 | Fair Value, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 142,839 135,173
Net change in unrealized appreciation (depreciation) on investments (158) (75)
Purchase of investments 3 12,500
Proceeds from sales and repayments of investments (16,690) (209)
Interest and dividend income paid-in-kind 824 1,102
Proceeds from loan origination fees   (156)
Accretion of loan origination fees 112 50
Accretion of original issue discount 2 2
Ending Balance 126,932 148,387
First Lien Debt | Level 3 | Fair Value, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 718,120 578,140
Net change in unrealized appreciation (depreciation) on investments 1,180 1,116
Purchase of investments 104,846 96,142
Proceeds from sales and repayments of investments (23,729) (41,963)
Interest and dividend income paid-in-kind 700 256
Proceeds from loan origination fees (621) (896)
Accretion of loan origination fees 409 478
Accretion of original issue discount 19 17
Ending Balance 800,924 633,290
Second Lien Debt | Level 3 | Fair Value, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 83,543 119,561
Net change in unrealized appreciation (depreciation) on investments (2,203) 453
Purchase of investments 6,746 28,850
Proceeds from sales and repayments of investments   (14,852)
Interest and dividend income paid-in-kind 715 691
Proceeds from loan origination fees (56) (79)
Accretion of loan origination fees 27 28
Accretion of original issue discount 22 97
Ending Balance 88,794 134,749
Equity | Level 3 | Fair Value, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 138,371 120,007
Net realized gains (losses) on investments 6,131 1,743
Net change in unrealized appreciation (depreciation) on investments (3,523) (1,456)
Purchase of investments 3,960 8,369
Proceeds from sales and repayments of investments (7,468) (3,222)
Ending Balance 137,471 125,441
Warrant | Level 3 | Fair Value, Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 7,633 4,768
Net realized gains (losses) on investments 7,199  
Net change in unrealized appreciation (depreciation) on investments (5,089) 1,184
Proceeds from sales and repayments of investments (9,456) (1)
Ending Balance $ 287 $ 5,951