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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 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 $ (5,885) $ 4,369 $ (6,345)
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     12,527 (5,483)
Net change in unrealized appreciation (depreciation) on investments     (829) 1,914
Purchase of investments     208,306 147,348
Proceeds from sales and repayments of investments     (103,343) (76,456)
Interest and dividend income paid-in-kind     3,894 1,872
Proceeds from loan origination fees     (1,365) (1,762)
Accretion of loan origination fees     1,106 775
Accretion of original issue discount     231 228
Ending Balance 1,078,176 928,455 1,078,176 928,455
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     1,334 (842)
Purchase of investments     12,500 23,682
Proceeds from sales and repayments of investments     (2,709)  
Interest and dividend income paid-in-kind     2,096 812
Proceeds from loan origination fees     (156) (508)
Accretion of loan origination fees     104 54
Accretion of original issue discount     4 3
Ending Balance 148,346 124,657 148,346 124,657
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     1,640 (76)
Purchase of investments     154,282 92,162
Proceeds from sales and repayments of investments     (59,157) (26,264)
Interest and dividend income paid-in-kind     555 237
Proceeds from loan origination fees     (1,130) (923)
Accretion of loan origination fees     909 653
Accretion of original issue discount     34 34
Ending Balance 675,273 521,928 675,273 521,928
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       (9,333)
Net change in unrealized appreciation (depreciation) on investments     (2,086) 4,737
Purchase of investments     28,850 25,000
Proceeds from sales and repayments of investments     (25,683) (42,413)
Interest and dividend income paid-in-kind     1,243 823
Proceeds from loan origination fees     (79) (331)
Accretion of loan origination fees     93 68
Accretion of original issue discount     193 191
Ending Balance 122,092 161,690 122,092 161,690
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     12,527 3,850
Net change in unrealized appreciation (depreciation) on investments     (3,670) (2,529)
Purchase of investments     12,674 6,504
Proceeds from sales and repayments of investments     (15,793) (7,779)
Ending Balance 125,745 117,477 125,745 117,477
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     1,953 624
Proceeds from sales and repayments of investments     (1)  
Ending Balance $ 6,720 $ 2,703 $ 6,720 $ 2,703