Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts payable and other accrued liabilities
Accounts payable	$ 20,267	$ 18,793
Accrued liabilities	12,965	13,749
Total Accounts payable and other accrued liabilities	33,232	32,542
Accrued payroll costs
Payroll and benefits	38,035	34,768
Payroll taxes	992	920
Health insurance liabilities	3,907	2,680
Workers’ compensation liabilities	1,067	1,016
Total Accrued payroll costs	$ 44,001	$ 39,384