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Supplemental Cash Flow Information (Net Changes in Components of Operating Assets and Liabilities) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
(Increase) decrease in:    
Accounts receivable $ (170,635) $ 15,487
Inventories (12,677) 11,108
Deferred charges 47,191 20,362
Other current assets (4,717) (10,335)
Increase (decrease) in:    
Accounts payable 109,687 (50,361)
Accrued liabilities (17,425) 20,196
Net changes in components of operating assets and liabilities $ (48,576) $ 6,457