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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Payables And Accruals [Abstract] |  |
Salaries and wages | $ 46,685 | $ 50,991
Employee benefits | 259,081 | 214,008
Self-insurance liability | 29,997 | 29,682
Project cost accruals | 217,729 | 183,362
Other accrued expenses | 86,371 | 81,657
Total accrued expenses and other current liabilities | $ 639,863 | $ 559,700

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