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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts Payable and Accrued Liabilities    
Retention amounts included in accounts payable $ 11,300 $ 13,200
Accrued liabilities    
Payroll and related employee benefits 64,705 60,509
Current operating lease liability 74,036  
Casualty insurance reserves 9,918 11,360
Corporate income taxes and other taxes 9,027 5,040
Other 25,815 40,618
Total accrued liabilities $ 183,501 $ 117,527