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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 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 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 $ (2,861) $ 1,593 $ 1,099 $ (4,505)
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     12,161 4,267
Net change in unrealized appreciation (depreciation) on investments     (5,149) (143)
Purchase of investments     274,194 204,049
Proceeds from sales and repayments of investments     (154,109) (146,316)
Interest and dividend income paid-in-kind     5,745 4,661
Proceeds from loan origination fees     (1,952) (2,098)
Accretion of loan origination fees     1,801 1,809
Accretion of original issue discount     335 344
Ending Balance 1,090,675 926,592 1,090,675 926,592
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     1,256 (1,314)
Purchase of investments     12,500 29,041
Proceeds from sales and repayments of investments     (2,864) (10,149)
Interest and dividend income paid-in-kind     3,101 2,343
Proceeds from loan origination fees     (157) (541)
Accretion of loan origination fees     156 140
Accretion of original issue discount     5 5
Ending Balance 149,170 120,981 149,170 120,981
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     (3,280)  
Net change in unrealized appreciation (depreciation) on investments     (1,467) (1,576)
Purchase of investments     212,495 135,283
Proceeds from sales and repayments of investments     (90,314) (68,761)
Interest and dividend income paid-in-kind     822 850
Proceeds from loan origination fees     (1,672) (1,226)
Accretion of loan origination fees     1,503 1,563
Accretion of original issue discount     53 51
Ending Balance 696,280 522,289 696,280 522,289
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     (2,100) (9,333)
Net change in unrealized appreciation (depreciation) on investments     (2,481) 3,226
Purchase of investments     33,281 25,000
Proceeds from sales and repayments of investments     (36,472) (48,607)
Interest and dividend income paid-in-kind     1,822 1,468
Proceeds from loan origination fees     (123) (331)
Accretion of loan origination fees     142 106
Accretion of original issue discount     277 288
Ending Balance 113,907 154,765 113,907 154,765
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     17,541 13,600
Net change in unrealized appreciation (depreciation) on investments     (5,524) (1,976)
Purchase of investments     15,918 14,725
Proceeds from sales and repayments of investments     (24,458) (18,799)
Ending Balance 123,484 124,981 123,484 124,981
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     3,067 1,497
Proceeds from sales and repayments of investments     (1)  
Ending Balance $ 7,834 $ 3,576 $ 7,834 $ 3,576