Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts payable and other accrued liabilities:
Accounts payable	$ 41,836	$ 20,177
Accrued liabilities	36,147	15,356
Total Accounts payable and other accrued liabilities	77,983	35,533
Accrued payroll costs:
Payroll and benefits	60,402	38,257
Payroll taxes	7,623	21,842
Health insurance liabilities	4,184	4,641
Workers’ compensation liabilities	797	1,109
Total Accrued payroll costs	$ 73,006	$ 65,849