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Investments - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Member
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Investment Holdings [Line Items]      
CLO fund securities percentage of total assets 1.60% 3.30%  
Non qualified assets percentage of total assets 13.40% 17.60%  
Joint ventures percentage of total assets 10.80% 9.50%  
Fair Value $ 467,865 $ 576,478  
Unfunded commitment to investee 28,566 34,959  
Level II      
Investment Holdings [Line Items]      
Fair Value $ 65,300 65,000  
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 $ 8,900 8,600 $ 9,200
Aggregate fair value of investments in joint venture $ 59,300 59,000  
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    
BCP Great Lakes Partnership LP      
Investment Holdings [Line Items]      
Fair Value $ 45,000 40,300  
Series A-Great Lakes Funding II LLC      
Investment Holdings [Line Items]      
Percentage of class held 50.00%    
Fair Value $ 45,000 40,300  
Unfunded commitment to investee $ 5,500 $ 8,000