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Investments - Schedule of Fair Value Portfolio of Investments by Asset Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,130,178 | $ 2,963,955
Senior Secured |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 2,910,526 | 2,741,388
Unsecured Debt |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 58,125 | 54,056
Investment Funds And Vehicles |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 3,900 | 3,893
Preferred Stock | Equity Investments [Member] |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 40,345 | 41,488
Common Stock | Equity Investments [Member] |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 84,072 | 92,484
Warrant | Warrant Investment [Member] |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 33,210 | $ 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 | 93.00% | 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 Investments [Member] |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.30% | 1.40%
Investment Type Concentration Risk | Common Stock | Revenue Benchmark | Equity Investments [Member] |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 2.70% | 3.10%
Investment Type Concentration Risk | Warrant | Revenue Benchmark | Warrant Investment [Member] |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 1.00% | 1.10%

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