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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accrued salaries, wages and related employee benefits $ 38,470 $ 30,214
Contingent consideration, current portion 1,736 1,300
Accrued workers’ compensation and health benefits 3,654 3,948
Deferred revenue 7,143 6,538
Pension accrual 2,519 2,519
Right-of-use liability - Operating 9,871 10,348
Other accrued expenses 24,919 23,633
Accrued expenses and other current liabilities $ 88,312 $ 78,500