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Unaudited Consolidated Schedule Of Investments - Schedule Of Investment Portfolio at Cost and Fair value(Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |
Cost | $ 2,551,299 |  | $ 2,535,576
Fair Value | $ 2,527,537 |  | $ 2,488,715
Percentage of Total Net Assets | 208.60% | [1] | 208.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00%
Senior debt and 1st lien notes |  |  |
Schedule of Investments [Line Items] |  |  |
Cost | $ 1,699,117 |  | $ 1,705,353
Fair Value | $ 1,658,742 |  | $ 1,670,300
Percentage of Total Net Assets | 137.00% |  | 140.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 67.00% |  | 67.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 66.00% |  | 67.00%
Subordinated debt and 2nd lien notes |  |  |
Schedule of Investments [Line Items] |  |  |
Cost | $ 260,225 |  | $ 256,850
Fair Value | $ 246,902 |  | $ 238,215
Percentage of Total Net Assets | 21.00% |  | 20.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 10.00% |  | 10.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 10.00% |  | 10.00%
Structured products |  |  |
Schedule of Investments [Line Items] |  |  |
Cost | $ 105,043 |  | $ 107,314
Fair Value | $ 95,131 |  | $ 93,038
Percentage of Total Net Assets | 8.00% |  | 8.00%
Structured products | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 4.00% |  | 4.00%
Structured products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 4.00% |  | 4.00%
Equity shares |  |  |
Schedule of Investments [Line Items] |  |  |
Cost | $ 343,533 |  | $ 320,335
Fair Value | $ 413,482 |  | $ 374,704
Percentage 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] |  |  |
Percentage of Total Portfolio | 13.00% |  | 13.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 16.00% |  | 15.00%
Equity warrants |  |  |
Schedule of Investments [Line Items] |  |  |
Cost | $ 129 |  | $ 76
Fair Value | $ 2,586 |  | $ 2,392
Percentage 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] |  |  |
Percentage 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] |  |  |
Percentage of Total Portfolio | 0.00% |  | 0.00%
Investment in joint ventures / PE fund |  |  |
Schedule of Investments [Line Items] |  |  |
Cost | $ 143,252 |  | $ 145,648
Fair Value | $ 110,694 |  | $ 110,066
Percentage of Total Net Assets | 9.00% |  | 9.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 6.00% |  | 6.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |
Schedule of Investments [Line Items] |  |  |
Percentage of Total Portfolio | 4.00% |  | 4.00%
[1] | Fair value as a percentage of net assets.

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