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Investments - Schedule of Composition of Investment Portfolio at Cost And Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | $ 2,449,272 | $ 2,488,715
Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 1,686,411 | 1,670,300
Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 165,455 | 238,215
Structured Product |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 79,548 | 93,038
Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 409,129 | 374,704
Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 2,732 | 2,392
Royalty rights |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 5,833 |
Investments in joint ventures / PE fund |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 100,164 | 110,066
Level 1 |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 0 | 132
Level 1 | Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 0 | 0
Level 1 | Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 0 | 0
Level 1 | Structured Product |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 0 | 0
Level 1 | Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 0 | 132
Level 1 | Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 0 | 0
Level 1 | Royalty rights |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 0 |
Level 2 |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 104,200 | 140,986
Level 2 | Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 60,910 | 76,503
Level 2 | Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 11,752 | 14,417
Level 2 | Structured Product |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 30,884 | 50,066
Level 2 | Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 654 | 0
Level 2 | Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value |  | 0
Level 2 | Royalty rights |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value |  |
Level 3 |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 2,244,908 | 2,237,531
Level 3 | Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 1,625,501 | 1,593,797
Level 3 | Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 153,703 | 223,798
Level 3 | Structured Product |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 48,664 | 42,972
Level 3 | Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 408,475 | 374,572
Level 3 | Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 2,732 | 2,392
Level 3 | Royalty rights |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 5,833 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | 2,349,108 | 2,378,649
Fair Value Measured at Net Asset Value Per Share | Investment in joint ventures |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value | $ 100,164 |
Fair Value Measured at Net Asset Value Per Share | Investments in joint ventures / PE fund |  |
Summary of Investment Holdings [Line Items] |  |
Total investments at fair value |  | $ 110,066

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