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Consolidated Schedule of Investments - Schedule of Investment Portfolio at Cost and Fair Value (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 2,522,696 |  | $ 2,535,576 |
Total investments at fair value | $ 2,449,272 |  | $ 2,488,715 |
Percent of Total Net Assets | 205.80% | [1] | 208.00% | [2]
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 100.00% |  | 100.00% |
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 100.00% |  | 100.00% |
Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 1,747,841 |  | $ 1,705,353 |
Total investments at fair value | $ 1,686,411 |  | $ 1,670,300 |
Percent of Total Net Assets | 142.00% |  | 140.00% |
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 69.00% |  | 67.00% |
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 69.00% |  | 67.00% |
Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 184,043 |  | $ 256,850 |
Total investments at fair value | $ 165,455 |  | $ 238,215 |
Percent of Total Net Assets | 14.00% |  | 20.00% |
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 7.00% |  | 10.00% |
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 7.00% |  | 10.00% |
Structured Product |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 89,543 |  | $ 107,314 |
Total investments at fair value | $ 79,548 |  | $ 93,038 |
Percent of Total Net Assets | 7.00% |  | 8.00% |
Structured Product | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 4.00% |  | 4.00% |
Structured Product | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 3.00% |  | 4.00% |
Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 360,691 |  | $ 320,335 |
Total investments at fair value | $ 409,129 |  | $ 374,704 |
Percent of Total Net Assets | 34.00% |  | 31.00% |
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 14.00% |  | 13.00% |
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 17.00% |  | 15.00% |
Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 76 |  | $ 76 |
Total investments at fair value | $ 2,732 |  | $ 2,392 |
Percent of Total Net Assets | 0.00% |  | 0.00% |
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 0.00% |  | 0.00% |
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 0.00% |  | 0.00% |
Investments in joint ventures / PE fund |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 136,875 |  | $ 145,648 |
Total investments at fair value | $ 100,164 |  | $ 110,066 |
Percent of Total Net Assets | 8.00% |  | 9.00% |
Investments in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 6.00% |  | 6.00% |
Investments in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of Total Portfolio | 4.00% |  | 4.00% |
[1] | Fair value as a percentage of net assets.
[2] | Fair value as a percentage of net assets.

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