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Portfolio Company Investments - Schedule of Investments Type With Corresponding Percentage of Total Portfolio Investments (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 856,914 $ 719,124
Percentage of Fair Value 100.00% 100.00%
Investments at cost $ 827,390 $ 621,786
Percentage of Cost 100.00% 100.00%
First Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 488,334 $ 354,922
Percentage of Fair Value 57.00% 49.40%
Investments at cost $ 487,999 $ 353,306
Percentage of Cost 59.00% 56.80%
Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 177,222 $ 158,815
Percentage of Fair Value 20.70% 22.10%
Investments at cost $ 200,028 $ 168,573
Percentage of Cost 24.20% 27.10%
Subordinated Debt    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 81,759 $ 36,064
Percentage of Fair Value 9.50% 5.00%
Investments at cost $ 80,477 $ 35,995
Percentage of Cost 9.70% 5.80%
Equity    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 106,951 $ 166,119
Percentage of Fair Value 12.50% 23.10%
Investments at cost $ 55,563 $ 60,589
Percentage of Cost 6.70% 9.80%
Warrants    
Summary of Investment Holdings [Line Items]    
Investments at Fair Value $ 2,648 $ 3,204
Percentage of Fair Value 0.30% 0.40%
Investments at cost $ 3,323 $ 3,323
Percentage of Cost 0.40% 0.50%