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Accrued Payroll Costs
 9 Months Ended
Sep. 30, 2018
Payables and Accruals [Abstract]  
Accrued Payroll Costs Accrued Payroll Costs
Accrued payroll costs consisted of the following (in thousands):
September 30, 2018December 31, 2017
Payroll and benefits $42,721 $37,788 
Health insurance liabilities 3,265 2,596 
Payroll taxes 1,861 5,270 
Workers’ compensation liabilities 1,016 1,232 
Total Accrued payroll costs $48,863 $46,886