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Investments - Summary of Investments in CLO Fund Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 620,821 | $ 652,217
Fair Value |  | 539,122 | 576,478
CLO Fund Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | 30,860 | 34,649
Fair Value |  | $ 19,241 | 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 |  | $ 4,314 | 4,216
Fair Value |  | $ 3,297 | 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 |  | $ 2,534 | 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 |  | $ 6,269 | 6,338
Fair Value |  | $ 5,284 | 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 |  | $ 896 | 868
Fair Value |  | $ 846 | 868
CLO Fund Securities | Subordinated Notes | JMP CLO IV Junior Sub Note |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 57.00% |
Cost/Amortized Cost |  | $ 4,262 | 4,020
Fair Value |  | $ 3,295 | 4,020
CLO Fund Securities | Subordinated Notes | JMP CLO V Junior Sub Note |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of class held | [1] | 57.00% |
Cost/Amortized Cost |  | $ 6,519 | 10,607
Fair Value |  | $ 6,519 | $ 7,580
[1] | Represents percentage of class held at March 31, 2023.

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