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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, 2024
Dec. 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 on investments Realized gain on investments
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized gain on investments Realized gain on investments
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net change in unrealized appreciation (depreciation) on investments $ 984 $ (12,219)
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 12,155 24,071
Net change in unrealized appreciation (depreciation) on investments (6,241) (10,353)
Purchase of investments 394,532 336,741
Proceeds from sales and repayments of investments (276,861) (258,828)
Interest and dividend income paid-in-kind 7,840 6,634
Proceeds from loan origination fees (2,569) (3,600)
Accretion of loan origination fees 2,814 2,504
Accretion of original issue discount 1,187 461
Ending Balance 1,090,506 957,649
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 realized gains (losses) on investments   178
Net change in unrealized appreciation (depreciation) on investments 1,057 (1,096)
Purchase of investments 21,966 42,041
Proceeds from sales and repayments of investments (19,689) (10,328)
Interest and dividend income paid-in-kind 4,050 3,348
Proceeds from loan origination fees (194) (622)
Accretion of loan origination fees 469 189
Accretion of original issue discount 7 7
Ending Balance 142,839 135,173
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 realized gains (losses) on investments (3,482)  
Net change in unrealized appreciation (depreciation) on investments (11,420) (2,064)
Purchase of investments 318,608 245,741
Proceeds from sales and repayments of investments (164,986) (122,680)
Interest and dividend income paid-in-kind 1,270 1,516
Proceeds from loan origination fees (2,252) (2,647)
Accretion of loan origination fees 2,172 2,101
Accretion of original issue discount 70 68
Ending Balance 718,120 578,140
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 realized gains (losses) on investments (2,154) (10,168)
Net change in unrealized appreciation (depreciation) on investments (3,462) 1,461
Purchase of investments 33,281 25,000
Proceeds from sales and repayments of investments (67,363) (81,719)
Interest and dividend income paid-in-kind 2,520 1,770
Proceeds from loan origination fees (123) (331)
Accretion of loan origination fees 173 214
Accretion of original issue discount 1,110 386
Ending Balance 83,543 119,561
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 17,791 34,061
Net change in unrealized appreciation (depreciation) on investments 4,719 (11,343)
Purchase of investments 20,677 23,959
Proceeds from sales and repayments of investments (24,823) (44,101)
Ending Balance 138,371 120,007
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 realized gains (losses) on investments 0  
Net change in unrealized appreciation (depreciation) on investments 2,865 2,689
Proceeds from sales and repayments of investments 0  
Ending Balance $ 7,633 $ 4,768