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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Employee compensation and benefits $ 28,742 $ 34,119
Project related reimbursable expenses 68,746 68,696
Other 5,462 6,437
Total accrued expenses $ 102,950 $ 109,252