Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts payable and other accrued liabilities:
Accounts payable	$ 48,855	$ 40,241
Accrued liabilities	41,473	41,167
Total Accounts payable and other accrued liabilities	90,328	81,408
Accrued payroll costs:
Payroll and benefits	51,724	43,738
Payroll taxes	29,791	22,466
Health insurance liabilities	4,342	4,474
Workers’ compensation liabilities	772	746
Total Accrued payroll costs	$ 86,629	$ 71,424