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Investments - Schedule of Composition of Portfolio Investments by Geographic Region (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%
West    
Schedule Of Investments [Line Items]    
Cost $ 451,413 $ 468,917
Cost, Percentage 31.90% 35.50%
Fair Value $ 436,480 $ 464,909
Fair Value, Percentage 32.10% 36.50%
Northeast    
Schedule Of Investments [Line Items]    
Cost $ 409,086 $ 392,739
Cost, Percentage 28.80% 29.80%
Fair Value $ 398,610 $ 383,008
Fair Value, Percentage 29.20% 29.90%
South    
Schedule Of Investments [Line Items]    
Cost $ 189,131 $ 169,014
Cost, Percentage 13.30% 12.80%
Fair Value $ 194,746 $ 172,746
Fair Value, Percentage 14.30% 13.50%
Mountain    
Schedule Of Investments [Line Items]    
Cost $ 135,732 $ 118,126
Cost, Percentage 9.60% 9.00%
Fair Value $ 128,827 $ 110,681
Fair Value, Percentage 9.40% 8.70%
Southeast    
Schedule Of Investments [Line Items]    
Cost $ 86,865 $ 43,878
Cost, Percentage 6.10% 3.30%
Fair Value $ 84,516 $ 42,129
Fair Value, Percentage 6.20% 3.30%
Midwest    
Schedule Of Investments [Line Items]    
Cost $ 84,336 $ 64,535
Cost, Percentage 5.90% 4.90%
Fair Value $ 76,810 $ 56,945
Fair Value, Percentage 5.60% 4.50%
Senior Credit Corp 2022 LLC    
Schedule Of Investments [Line Items]    
Cost [1] $ 13,421 $ 11,006
Cost, Percentage [1] 0.90% 0.80%
Fair Value [1] $ 14,004 $ 11,335
Fair Value, Percentage [1] 1.00% 0.90%
Western Europe    
Schedule Of Investments [Line Items]    
Cost $ 19,930 $ 22,235
Cost, Percentage 1.40% 1.70%
Fair Value $ 19,850 $ 22,400
Fair Value, Percentage 1.50% 1.80%
Canada    
Schedule Of Investments [Line Items]    
Cost $ 30,084 $ 28,866
Cost, Percentage 2.10% 2.20%
Fair Value $ 10,019 $ 11,027
Fair Value, Percentage 0.70% 0.90%
[1] Senior Credit Corp 2022 LLC is a joint venture between the Company and the JV Partner. This entity invests in secured loans and equipment financings to growth-stage companies that have been originated by the Company. The portfolio companies held by the JV represent a diverse set of geographical classifications, which are similar to those in which the Company invests directly. See “Note 1 – Organization and Basis of Presentation” for further discussion.