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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Employee compensation and benefits $ 22,383 $ 34,119
Project related reimbursable expenses 76,136 68,696
Other 8,486 6,437
Total accrued expenses $ 107,005 $ 109,252