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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

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