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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, 2023 | Dec. 31, 2022
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 3,130,178 | $ 2,963,955
United States |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 2,829,873 | 2,670,520
United Kingdom |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 174,678 | 171,629
Netherlands |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 89,952 | 88,915
Canada |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 11,132 | 19,472
Israel |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 19,432 | 9,052
Denmark |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 3,739 | 0
Ireland |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 0 | 2,804
Germany |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | 893 | 990
Other |  |
Schedule Of Investments [Line Items] |  |
Investments at Fair Value | $ 479 | $ 573
Geographic Concentration Risk [Member] | Revenue Benchmark |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 100.00% | 100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | United States |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 90.40% | 90.10%
Geographic Concentration Risk [Member] | Revenue Benchmark | United Kingdom |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 5.60% | 5.80%
Geographic Concentration Risk [Member] | Revenue Benchmark | Netherlands |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 2.90% | 3.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | Canada |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.40% | 0.70%
Geographic Concentration Risk [Member] | Revenue Benchmark | Israel |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.60% | 0.30%
Geographic Concentration Risk [Member] | Revenue Benchmark | Denmark |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.10% | 0.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | Ireland |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.10%
Geographic Concentration Risk [Member] | Revenue Benchmark | Germany |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | Other |  |
Schedule Of Investments [Line Items] |  |
Concentration Risk, Percentage | 0.00% | 0.00%

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