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Investments - Additional Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Member
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Investment Holdings [Line Items]          
CLO fund securities percentage of total assets 1.60%   1.60%    
Non qualified assets percentage of total assets 12.90%   13.40%    
Joint ventures percentage of total assets 10.10%   10.80%    
Fair Value $ 471,255   $ 467,865    
Unfunded commitment to investee 33,338   28,566    
Level II          
Investment Holdings [Line Items]          
Fair Value $ 66,000   65,300    
Non Qualifying Assets          
Investment Holdings [Line Items]          
Investment portfolio percentage 30.00%        
Joint venture          
Investment Holdings [Line Items]          
Investment income from investments in joint ventures $ 1,700 $ 2,500      
Aggregate fair value of investments in joint venture $ 53,200   59,300    
F3C Joint Venture          
Investment Holdings [Line Items]          
F3C Joint venture ownership percentage 62.80%        
Number of board of directors | Member 4        
Directors selected by company | Member 2        
Directors selected by Freedom 3 Opportunities | Member 2        
Fair Value $ 13,500   14,300    
Series A-Great Lakes Funding II LLC          
Investment Holdings [Line Items]          
Percentage of voting interest 50.00%        
Fair Value $ 39,600   45,000 $ 39,600 $ 45,000
Increase in aggregate commitment to investee 50,000        
Unfunded commitment to investee $ 10,900   $ 5,500