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Investments - Summarized Statements of Financial Condition (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment Holdings [Line Items]          
Investment at fair value $ 576,478 $ 549,985      
Total Assets 619,486 648,301      
Total Liabilities 387,363 368,179      
Total Equity [1] 232,123 280,122 $ 216,264 $ 152,199 $ 158,021
Total Liabilities and Net Assets $ 619,486 648,301      
F3C Joint Venture          
Investment Holdings [Line Items]          
Investment at fair value   35,841      
Total Assets   35,841      
Total Liabilities   164      
Total Equity   35,677      
Total Liabilities and Net Assets   $ 35,841      
[1] Totals may not sum due to rounding.