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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued salaries, wages and related employee benefits $ 28,930 $ 27,185
Contingent consideration, current portion 1,669 3,430
Accrued workers’ compensation and health benefits 4,808 5,181
Deferred revenue 5,560 6,338
Legal settlement accrual 0 1,600
Other accrued expenses 22,955 21,827
Total accrued expenses and other current liabilities $ 63,922 $ 65,561