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Fair Value of Financial Instruments - Summary of Reconciliation of Investments that Use Level 3 Inputs (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 1,513,914 $ 1,470,147
Amortized discounts/premiums 5,255 6,774
Paid in-kind interest 8,198 8,029
Net realized gain (loss) $ (13,856) $ (4,055)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation) $ 441 $ 3,550
Purchases 236,087 301,691
Sales/return of capital/principal repayments/paydowns (239,309) (274,799)
Transfers in 24,531 21,852
Transfers out   (3,330)
Ending balance 1,535,261 1,529,859
Net change in unrealized appreciation (depreciation) from investments still held (5,768) 3,550
Senior Secured First Lien    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance 379,628 409,945
Amortized discounts/premiums 1,237 1,588
Paid in-kind interest 1,622 2,326
Net realized gain (loss) $ (8,214) $ (969)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation) $ 2,835 $ (6,373)
Purchases 60,334 84,077
Sales/return of capital/principal repayments/paydowns (84,630) (91,472)
Transfers in   2,546
Ending balance 352,812 401,668
Net change in unrealized appreciation (depreciation) from investments still held (3,683) (6,373)
Unitranche First Lien    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance 1,013,934 948,781
Amortized discounts/premiums 3,733 4,839
Paid in-kind interest 3,681 2,201
Net realized gain (loss) $ (3,604) $ (232)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation) $ (10,003) $ 3,929
Purchases 149,225 194,932
Sales/return of capital/principal repayments/paydowns (147,462) (155,817)
Transfers in 24,531 19,186
Ending balance 1,034,035 1,017,819
Net change in unrealized appreciation (depreciation) from investments still held (8,959) 3,929
Unitranche First Last Out    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance 14,741 13,544
Amortized discounts/premiums 53 93
Paid in-kind interest 681 617
Net realized gain (loss)   $ (2,308)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation) 921 $ 2,269
Purchases 9,774  
Sales/return of capital/principal repayments/paydowns   (8,369)
Ending balance 26,170 5,846
Net change in unrealized appreciation (depreciation) from investments still held 921 2,269
Senior Secured Second Lien    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance 24,351 44,907
Amortized discounts/premiums 75 237
Paid in-kind interest 352 1,571
Net realized gain (loss) $ (693)  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments  
Net change in unrealized appreciation (depreciation) $ 1,779 (2,891)
Purchases   5,000
Sales/return of capital/principal repayments/paydowns (7,217) (18,068)
Transfers out   (3,330)
Ending balance 18,647 27,426
Net change in unrealized appreciation (depreciation) from investments still held 1,497 (2,891)
Unsecured Debt    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance 17,525 4,061
Amortized discounts/premiums 157 17
Paid in-kind interest 1,862 1,314
Net change in unrealized appreciation (depreciation) (13) 1,390
Purchases 0 11,904
Ending balance 19,531 18,686
Net change in unrealized appreciation (depreciation) from investments still held (13) 1,390
Equity & Other    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning balance 63,735 48,909
Net realized gain (loss) $ (1,345) $ (546)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation) $ 4,922 $ 5,226
Purchases 16,754 5,778
Sales/return of capital/principal repayments/paydowns   (1,073)
Transfers in   120
Ending balance 84,066 58,414
Net change in unrealized appreciation (depreciation) from investments still held $ 4,469 $ 5,226