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Investments - Summary of Investments in CLO Fund Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 584,586 | $ 652,217
Fair Value |  | 500,419 | 576,478
CLO Fund Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | 21,868 | 34,649
Fair Value |  | $ 10,425 | 20,453
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2014-1 Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 22.00% |
Cost/Amortized Cost |  | $ 938 | 4,216
Fair Value |  | $ 938 | 3,232
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2014-2 Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 25.00% |
Cost/Amortized Cost |  | $ 6,066 | 6,066
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2015-1 Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 10.00% |
Cost/Amortized Cost |  | $ 2,531 | 2,534
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2018-1 Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 25.00% |
Cost/Amortized Cost |  | $ 5,794 | 6,338
Fair Value |  | $ 3,945 | 4,753
CLO Fund Securities | Subordinated Notes | Dryden 30 Senior Loan Fund |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 7.00% |
Cost/Amortized Cost |  | $ 454 | 868
Fair Value |  | $ 455 | 868
CLO Fund Securities | Subordinated Notes | JMP Credit Advisors CLO IV Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 57.00% |
Cost/Amortized Cost |  | $ 1,860 | 4,020
Fair Value |  | $ 1,204 | 4,020
CLO Fund Securities | Subordinated Notes | JMP Credit Advisors CLO V Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 57.00% |
Cost/Amortized Cost |  | $ 4,225 | 10,607
Fair Value |  | $ 3,883 | $ 7,580
[1] | Represents percentage of class held at September 30, 2023.

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