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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities And Other Liabilities [Abstract]    
Employee compensation and benefits $ 34,119 $ 31,344
Project related reimbursable expenses 68,696 51,109
Other 6,437 5,040
Total accrued expenses $ 109,252 $ 87,493