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Investments - Schedule of Portfolio Investments by Investment Type at Cost and Fair Value and as Percentage of Total Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Investments [Line Items]    
Cost $ 1,419,998 $ 1,319,316
Cost, Percentage 100.00% 100.00%
Fair Value $ 1,363,862 $ 1,275,180
Fair Value, Percentage 100.00% 100.00%
Secured Loans    
Schedule Of Investments [Line Items]    
Cost $ 1,055,348 $ 918,836
Cost, Percentage 74.30% 69.70%
Fair Value $ 1,010,841 $ 885,299
Fair Value, Percentage 74.10% 69.50%
Equipment Financing    
Schedule Of Investments [Line Items]    
Cost $ 279,111 $ 336,934
Cost, Percentage 19.70% 25.50%
Fair Value $ 277,550 $ 336,778
Fair Value, Percentage 20.40% 26.40%
Warrants    
Schedule Of Investments [Line Items]    
Cost $ 32,868 $ 30,244
Cost, Percentage 2.30% 2.30%
Fair Value $ 39,930 $ 33,527
Fair Value, Percentage 2.90% 2.60%
Equity    
Schedule Of Investments [Line Items]    
Cost $ 52,671 $ 33,302
Cost, Percentage 3.70% 2.50%
Fair Value $ 35,541 $ 19,576
Fair Value, Percentage 2.60% 1.50%