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Investments - Schedule of Fair Value Portfolio of Investments by Asset Class (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,112,789 | $ 2,963,955
Senior Secured |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 2,878,923 | 2,741,388
Unsecured Debt |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 59,019 | 54,056
Investment Funds And Vehicles |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 4,353 | 3,893
Preferred Stock | Equity |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 41,249 | 41,488
Common Stock | Equity |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 94,931 | 92,484
Warrants | Warrant |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 34,314 | $ 30,646
Geographic Concentration Risk [Member] | Revenue Benchmark |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 100.00% | 100.00%
Investment Type Concentration Risk | Revenue Benchmark |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 100.00% | 100.00%
Investment Type Concentration Risk | Revenue Benchmark | Senior Secured |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 92.50% | 92.50%
Investment Type Concentration Risk | Revenue Benchmark | Unsecured Debt |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.90% | 1.80%
Investment Type Concentration Risk | Revenue Benchmark | Investment Funds And Vehicles |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.10% | 0.10%
Investment Type Concentration Risk | Preferred Stock | Revenue Benchmark | Equity |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.40% | 1.40%
Investment Type Concentration Risk | Common Stock | Revenue Benchmark | Equity |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 3.00% | 3.10%
Investment Type Concentration Risk | Warrants | Revenue Benchmark | Warrant |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.10% | 1.10%

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