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Investments - Summary of Investments in CLO Fund Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Summary of Investment Holdings [Line Items]    
Cost/Amortized Cost $ 543,601 $ 540,282
Fair Value 471,255 467,865
CLO Fund Securities    
Summary of Investment Holdings [Line Items]    
Cost/Amortized Cost 8,762 9,103
Fair Value 8,549 $ 8,968
CLO Fund Securities | Subordinated Notes    
Summary of Investment Holdings [Line Items]    
Cost/Amortized Cost 8,762  
Fair Value $ 8,549  
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2014-1 Ltd.    
Summary of Investment Holdings [Line Items]    
Percentage Ownership [1] 22.20% 22.20%
Cost/Amortized Cost $ 702 $ 1,024
Fair Value $ 702 $ 904
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2018-1 Ltd.    
Summary of Investment Holdings [Line Items]    
Percentage Ownership [1] 24.80% 24.80%
Cost/Amortized Cost $ 3,846 $ 3,923
Fair Value $ 3,757 $ 3,923
CLO Fund Securities | Subordinated Notes | Dryden 30 Senior Loan Fund    
Summary of Investment Holdings [Line Items]    
Percentage Ownership [1] 6.80% 6.80%
Cost/Amortized Cost $ 246 $ 424
Fair Value $ 246 $ 409
CLO Fund Securities | Subordinated Notes | JMP Credit Advisors CLO IV Ltd.    
Summary of Investment Holdings [Line Items]    
Percentage Ownership [1] 57.20% 57.20%
Cost/Amortized Cost $ 715 $ 683
Fair Value $ 668 $ 683
CLO Fund Securities | Subordinated Notes | JMP Credit Advisors CLO V Ltd.    
Summary of Investment Holdings [Line Items]    
Percentage Ownership [1] 57.20% 57.20%
Cost/Amortized Cost $ 3,253 $ 3,049
Fair Value 3,176 3,049
Equity Securities    
Summary of Investment Holdings [Line Items]    
Cost/Amortized Cost 34,077 31,280
Fair Value $ 23,428 $ 20,533
[1] Represents percentage of class held at March 31, 2024 and December 31, 2023, respectively.