v3.26.3
Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Fair Valued Investments (Details) - Level 3 - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 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 $ 656 $ 521 $ (6,039) $ 6,578
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     $ (16,661) $ 4,832
Net change in unrealized appreciation (depreciation) on investments     13,358 8,009
Purchase of investments     268,422 284,480
Proceeds from sales and repayments of investments     (164,651) (203,319)
Interest and dividend income paid-in-kind     9,677 7,884
Proceeds from loan origination fees     (1,729) (1,757)
Accretion of loan origination fees     1,960 2,007
Accretion of original issue discount     46 106
Transfers by type       0
Ending Balance 1,435,175 1,192,748 1,435,175 1,192,748
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 realized gains (losses) on investments     (89)  
Net change in unrealized appreciation (depreciation) on investments     (1,346) (470)
Purchase of investments     190 0
Proceeds from sales and repayments of investments     (16,932) (37,246)
Interest and dividend income paid-in-kind     1,522 2,378
Proceeds from loan origination fees     (4) 0
Accretion of loan origination fees     98 199
Accretion of original issue discount     5 5
Transfers by type       0
Ending Balance 77,856 107,705 77,856 107,705
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 (14,498)
Net change in unrealized appreciation (depreciation) on investments     (16,198) 23,929
Purchase of investments     252,655 256,210
Proceeds from sales and repayments of investments     (134,314) (137,539)
Interest and dividend income paid-in-kind     5,602 3,348
Proceeds from loan origination fees     (1,725) (1,667)
Accretion of loan origination fees     1,783 1,726
Accretion of original issue discount     41 101
Transfers by type       9,645
Ending Balance 1,126,907 859,375 1,126,907 859,375
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     (25,940)  
Net change in unrealized appreciation (depreciation) on investments     26,953 (7,381)
Purchase of investments     1 13,600
Proceeds from sales and repayments of investments     (901) 0
Interest and dividend income paid-in-kind     2,553 2,158
Proceeds from loan origination fees     0 (90)
Accretion of loan origination fees     79 82
Accretion of original issue discount       0
Transfers by type       (9,645)
Ending Balance 71,674 82,267 71,674 82,267
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     8,448 11,214
Net change in unrealized appreciation (depreciation) on investments     4,187 (2,876)
Purchase of investments     15,576 14,545
Proceeds from sales and repayments of investments     (11,584) (18,160)
Transfers by type       0
Ending Balance 158,738 143,094 158,738 143,094
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 8,116
Net change in unrealized appreciation (depreciation) on investments     (238) (5,193)
Purchase of investments     0 125
Proceeds from sales and repayments of investments     (920) (10,374)
Transfers by type       0
Ending Balance $ 0 $ 307 $ 0 $ 307