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Concentration of Risk - Regional Concentration Based on Net Book Value (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Concentration Risk [Line Items] |  |
Net Book Value | $ 24,538,385 | $ 22,899,004
Net Assets, Geographic Area | Geographic Region |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 24,538,385 | $ 22,899,004
% of Total | 100.00% | 100.00%
Net Assets, Geographic Area | Geographic Region | Europe |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 7,985,317 | $ 7,439,993
% of Total | 32.50% | 32.50%
Net Assets, Geographic Area | Geographic Region | Asia (excluding China) |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 7,144,188 | $ 5,952,981
% of Total | 29.10% | 26.00%
Net Assets, Geographic Area | Geographic Region | China |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 2,792,022 | $ 2,934,224
% of Total | 11.40% | 12.80%
Net Assets, Geographic Area | Geographic Region | The Middle East and Africa |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 2,253,342 | $ 2,447,919
% of Total | 9.30% | 10.70%
Net Assets, Geographic Area | Geographic Region | Central America, South America, and Mexico |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 1,924,216 | $ 1,566,133
% of Total | 7.80% | 6.80%
Net Assets, Geographic Area | Geographic Region | U.S. and Canada |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 1,557,260 | $ 1,638,450
% of Total | 6.30% | 7.20%
Net Assets, Geographic Area | Geographic Region | Pacific, Australia, and New Zealand |  |
Concentration Risk [Line Items] |  |
Net Book Value | $ 882,040 | $ 919,304
% of Total | 3.60% | 4.00%

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