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Portfolio Company Investments - Schedule of Investments Type With Corresponding Percentage of Total Portfolio Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 860,329 $ 719,124
Percentage of Fair Value 100.00% 100.00%
Investments at cost $ 828,693 $ 621,786
Percentage of Cost 100.00% 100.00%
First Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 456,105 $ 354,922
Percentage of Fair Value 53.00% 49.40%
Investments at cost $ 453,585 $ 353,306
Percentage of Cost 54.70% 56.80%
Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 182,948 $ 158,815
Percentage of Fair Value 21.30% 22.10%
Investments at cost $ 213,654 $ 168,573
Percentage of Cost 25.80% 27.10%
Subordinated Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 101,456 $ 36,064
Percentage of Fair Value 11.80% 5.00%
Investments at cost $ 100,634 $ 35,995
Percentage of Cost 12.10% 5.80%
Equity    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 117,741 $ 166,119
Percentage of Fair Value 13.70% 23.10%
Investments at cost $ 57,868 $ 60,589
Percentage of Cost 7.00% 9.80%
Warrants    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 2,079 $ 3,204
Percentage of Fair Value 0.20% 0.40%
Investments at cost $ 2,952 $ 3,323
Percentage of Cost 0.40% 0.50%