v3.26.1
Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Fair Valued Investments (Details) - Level 3 - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax
Net change in unrealized appreciation (depreciation) on investments $ 3,596 $ 7,554 $ (5,294) $ 131
Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     $ 1,324,753 1,090,506
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total       $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Realized Gain (Loss), Investment and Derivative, Operating, before Tax Realized Gain (Loss), Investment and Derivative, Operating, before Tax
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax
Net realized gains (losses) on investments     $ 5,780 $ 5,762
Net change in unrealized appreciation (depreciation) on investments     3,021 (4,585)
Purchase of investments     216,662 210,006
Proceeds from sales and repayments of investments     (112,228) (166,605)
Interest and dividend income paid-in-kind     6,551 4,699
Proceeds from loan origination fees     (1,425) (1,333)
Accretion of loan origination fees     1,326 1,598
Accretion of original issue discount     31 86
Transfers by type       0
Ending Balance 1,432,911 1,149,304 1,432,911 1,149,304
Subordinated Debt | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     94,412 142,839
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total       0
Net change in unrealized appreciation (depreciation) on investments     (220) (263)
Purchase of investments     190 0
Proceeds from sales and repayments of investments     (13,910) (37,089)
Interest and dividend income paid-in-kind     1,060 1,628
Proceeds from loan origination fees     (4) 0
Accretion of loan origination fees     73 169
Accretion of original issue discount     4 4
Transfers by type       0
Ending Balance 81,605 107,288 81,605 107,288
First Lien Debt | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     1,019,063 718,120
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total       9,645
Net realized gains (losses) on investments     0 (11,964)
Net change in unrealized appreciation (depreciation) on investments     (12,916) 20,138
Purchase of investments     209,853 186,369
Proceeds from sales and repayments of investments     (86,055) (103,483)
Interest and dividend income paid-in-kind     3,827 1,692
Proceeds from loan origination fees     (1,421) (1,243)
Accretion of loan origination fees     1,201 1,375
Accretion of original issue discount     27 82
Transfers by type       9,645
Ending Balance 1,133,579 820,731 1,133,579 820,731
Second Lien Debt | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     68,929 83,543
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total       (9,645)
Net realized gains (losses) on investments     (15,035)  
Net change in unrealized appreciation (depreciation) on investments     15,851 (6,326)
Purchase of investments     0 13,600
Proceeds from sales and repayments of investments     (899) 0
Interest and dividend income paid-in-kind     1,664 1,379
Proceeds from loan origination fees     0 (90)
Accretion of loan origination fees     52 54
Accretion of original issue discount       0
Transfers by type       (9,645)
Ending Balance 70,562 82,515 70,562 82,515
Equity | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     142,111 138,371
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total       0
Net realized gains (losses) on investments     8,335 10,527
Net change in unrealized appreciation (depreciation) on investments     544 (3,830)
Purchase of investments     6,619 9,912
Proceeds from sales and repayments of investments     (10,444) (16,576)
Transfers by type       0
Ending Balance 147,165 138,404 147,165 138,404
Warrant | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     238 7,633
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total       0
Net realized gains (losses) on investments     920 7,199
Net change in unrealized appreciation (depreciation) on investments     (238) (5,134)
Purchase of investments     0 125
Proceeds from sales and repayments of investments     (920) (9,457)
Transfers by type       0
Ending Balance $ 0 $ 366 $ 0 $ 366