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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 69,509 $ 71,197
Project related reimbursable expenses 183,998 128,416
Other 11,278 10,512
Total accrued expenses $ 264,785 $ 210,125