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Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts payable and other accrued liabilities:    
Accounts payable $ 21,489 $ 18,793
Accrued liabilities 14,537 13,749
Total Accounts payable and other accrued liabilities 36,026 32,542
Accrued payroll costs:    
Payroll and benefits 43,432 34,768
Health insurance liabilities 3,498 2,680
Payroll taxes 1,175 920
Workers’ compensation liabilities 1,044 1,016
Total Accrued payroll costs $ 49,149 $ 39,384