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Investments - Investment Portfolio at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 2,488,715 | [1] | $ 2,448,935
Senior debt and 1st lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 1,670,300 |  | 1,696,192
Subordinated debt and 2nd lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 238,215 |  | 263,139
Structured Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 93,038 |  | 73,550
Equity shares |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 374,704 |  | 284,570
Equity warrants |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 2,392 |  | 1,057
Investments in joint ventures / PE fund |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 110,066 |  | 130,427
Level 1 |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 132 |  | 164
Level 1 | Senior debt and 1st lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 0 |  | 0
Level 1 | Subordinated debt and 2nd lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 0 |  | 0
Level 1 | Structured Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 0 |  | 0
Level 1 | Equity shares |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 132 |  | 164
Level 1 | Equity warrants |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 0 |  | 0
Level 2 |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 140,986 |  | 190,823
Level 2 | Senior debt and 1st lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 76,503 |  | 104,836
Level 2 | Subordinated debt and 2nd lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 14,417 |  | 28,925
Level 2 | Structured Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 50,066 |  | 55,723
Level 2 | Equity shares |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 0 |  | 1,339
Level 2 | Equity warrants |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 0 |  | 0
Level 3 |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 2,237,531 |  | 2,127,521
Level 3 | Senior debt and 1st lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 1,593,797 |  | 1,591,356
Level 3 | Subordinated debt and 2nd lien notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 223,798 |  | 234,214
Level 3 | Structured Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 42,972 |  | 17,827
Level 3 | Equity shares |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 374,572 |  | 283,067
Level 3 | Equity warrants |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 2,392 |  | 1,057
Fair Value, Inputs, Level 1, Level 2, and Level 3 |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 2,378,649 |  | 2,318,508
Fair Value Measured at Net Asset Value Per Share |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 110,066 |  | $ 130,427
[1] | Fair value as a percentage of net assets.

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