Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts Payable and Accrued Liabilities
Retention amounts included in accounts payable	$ 20,000	$ 15,200
Accrued liabilities
Payroll and related employee benefits	114,441	77,887
Current operating lease liability	59,361	61,587
Casualty insurance reserves	10,475	7,107
Corporate income taxes and other taxes	20,359	7,967
Other	22,683	20,273
Total accrued liabilities	$ 227,319	$ 174,821