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Supplemental Cash Flow Information (Net Changes in Components of Operating Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
(Increase) decrease in:    
Accounts receivable $ (131,249) $ (99,504)
Inventories (282) 27,450
Deferred charges 12,805 7,731
Other current assets (2,677) (2,294)
Increase (decrease) in:    
Accounts payable 107,747 38,994
Accrued liabilities (15,513) 22,561
Net changes in components of operating assets and liabilities $ (29,169) $ (5,062)