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Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Other Liabilities Disclosure [Abstract] |  |
General trade and overhead liabilities | $ 463,882 | $ 530,204
Personnel related liabilities | 385,499 | 395,862
Operating lease liabilities | 36,414 | 43,657
Facility related liabilities | 11,078 | 16,896
Other liabilities | 13,532 | 12,852
Restructuring liabilities | 4,951 | 5,512
Short term government grants | 43 | 42
Other liabilities | 915,399 | 1,005,025
Amounts due to third parties for reimbursable expenses | $ 333,000 | $ 406,300

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