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Fair Value of Investments - Schedule of Net Change in Unrealized Gains on Investments (Details) - 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]        
Net change in unrealized gain (loss) $ (102,242) $ (111,430) $ (290,980) $ 17,137
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Net change in unrealized gain (loss)   Net change in unrealized gain (loss)
First-lien senior secured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (49,105) $ (91,669) (150,437) $ (40,510)
Second-lien senior secured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (68,508) (34,067) (130,487) (16,898)
Unsecured debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (648) 9,168 (5,859) 17,431
Specialty finance debt investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (11) 21 (23) 311
Preferred equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) (11,918) (4,973) (40,677) (1,254)
Common equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) 31,234 (18,939) 44,314 15,269
Specialty finance equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net change in unrealized gain (loss) $ (3,286) $ 29,029 $ (7,811) $ 42,788