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Other supplemental information - Accounts payable and accrued liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 137,571 $ 131,797
Compensation 109,173 115,061
Taxes (primarily property and sales taxes) 28,786 30,834
Benefits 22,120 22,821
Interest 22,327 3,676
Other 57,393 74,057
Accounts payable and accrued liabilities $ 377,370 $ 378,246