v3.26.3
Fair Value Measurements - Schedule of Changes in Fair Value of Investments (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Schedule of Investments [Line Items]        
Fair value, beginning of period $ 1,906,400 $ 1,089,314 $ 1,574,901 $ 778,371
Purchases of investments 177,803 249,939 597,381 600,978
Proceeds from principal repayments and sales of investments (31,305) (5,368) (117,148) (44,300)
Accretion of discount/amortization of premium 879 759 2,522 1,903
Payment-in-kind interest and fees capitalized 1,372 438 3,891 1,089
Net realized gain (loss) on investments 274 0 943 525
Net change in unrealized appreciation (depreciation) (1,105) (2,131) (8,172) (5,615)
Fair value, end of period 2,054,318 1,332,951 2,054,318 1,332,951
Net change in unrealized appreciation (depreciation) related to financial instruments still held (1,104) (2,131) (7,695) (5,088)
L.P. Interest        
Schedule of Investments [Line Items]        
Fair value, beginning of period 590 470 533 0
Purchases of investments 0 0 0 434
Proceeds from principal repayments and sales of investments 0 0 0 0
Accretion of discount/amortization of premium 0 0 0 0
Payment-in-kind interest and fees capitalized 0 0 0 0
Net realized gain (loss) on investments 0 0 0 0
Net change in unrealized appreciation (depreciation) 24 0 81 36
Fair value, end of period 614 470 614 470
Net change in unrealized appreciation (depreciation) related to financial instruments still held $ 24 $ 0 $ 81 $ 36
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Common Stock        
Schedule of Investments [Line Items]        
Fair value, beginning of period $ 1,125 $ 4,848 $ 1,598 $ 8,000
Purchases of investments 0 0 0 0
Proceeds from principal repayments and sales of investments 0 0 0 0
Accretion of discount/amortization of premium 0 0 0 0
Payment-in-kind interest and fees capitalized 0 0 0 0
Net realized gain (loss) on investments 0 0 0 0
Net change in unrealized appreciation (depreciation) (244) (2,620) (717) (5,772)
Fair value, end of period 881 2,228 881 2,228
Net change in unrealized appreciation (depreciation) related to financial instruments still held $ (244) $ (2,620) $ (717) $ (5,772)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Preferred Stock        
Schedule of Investments [Line Items]        
Fair value, beginning of period $ 596 $ 780 $ 846 $ 706
Purchases of investments 0 0 0 0
Proceeds from principal repayments and sales of investments 0 0 (273) 0
Accretion of discount/amortization of premium 0 0 0 0
Payment-in-kind interest and fees capitalized 0 0 39 46
Net realized gain (loss) on investments 0 0 4 0
Net change in unrealized appreciation (depreciation) 2 32 (18) 60
Fair value, end of period 598 812 598 812
Net change in unrealized appreciation (depreciation) related to financial instruments still held $ 2 $ 32 $ (18) $ 60
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
First Lien Debt        
Schedule of Investments [Line Items]        
Fair value, beginning of period $ 1,904,089 $ 1,083,216 $ 1,571,924 $ 769,665
Purchases of investments 177,803 249,939 597,381 600,544
Proceeds from principal repayments and sales of investments (31,305) (5,368) (116,875) (44,300)
Accretion of discount/amortization of premium 879 759 2,522 1,903
Payment-in-kind interest and fees capitalized 1,372 438 3,852 1,043
Net realized gain (loss) on investments 274 0 939 525
Net change in unrealized appreciation (depreciation) (887) 457 (7,518) 61
Fair value, end of period 2,052,225 1,329,441 2,052,225 1,329,441
Net change in unrealized appreciation (depreciation) related to financial instruments still held $ (886) $ 457 $ (7,041) $ 588
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments