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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.

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