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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Accrued Liabilities, Current [Abstract]    
Compensation and related expenses $ 111,174 $ 138,728
Performance awards 14,891 9,359
Direct project accruals 4,060 1,783
Other 7,795 5,994
Total accrued expenses 137,920 155,864
Compensation and related expenses    
Accrued bonuses $ 86,700 $ 116,100