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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.