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Investments - Schedule of Fair Value Portfolio of Investments by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,571,641 | $ 3,248,046
Geographic Concentration Risk | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,571,641 | $ 3,248,046
Percentage of Total Portfolio | 100.00% | 100.00%
Geographic Concentration Risk | United States | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,181,414 | $ 2,861,615
Percentage of Total Portfolio | 89.10% | 88.10%
Geographic Concentration Risk | United Kingdom | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 230,240 | $ 222,136
Percentage of Total Portfolio | 6.50% | 6.90%
Geographic Concentration Risk | Netherlands | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 90,894 | $ 89,995
Percentage of Total Portfolio | 2.50% | 2.80%
Geographic Concentration Risk | Israel | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 46,710 | $ 52,868
Percentage of Total Portfolio | 1.30% | 1.60%
Geographic Concentration Risk | Canada | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 16,392 | $ 15,730
Percentage of Total Portfolio | 0.50% | 0.50%
Geographic Concentration Risk | Denmark | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 4,211 | $ 4,173
Percentage of Total Portfolio | 0.10% | 0.10%
Geographic Concentration Risk | Germany | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 1,166 | $ 1,144
Percentage of Total Portfolio | 0.00% | 0.00%
Geographic Concentration Risk | Other | Total Investments Benchmark, Geographical |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 614 | $ 385
Percentage of Total Portfolio | 0.00% | 0.00%

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