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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, 2023
Mar. 31, 2022
(Increase) decrease in:    
Accounts receivable $ 180,813 $ (131,249)
Inventories (23,663) (282)
Deferred charges 11,461 12,805
Other current assets (11,365) (2,677)
Increase (decrease) in:    
Accounts payable (126,440) 107,747
Accrued liabilities (48,454) (15,513)
Net changes in components of operating assets and liabilities $ (17,648) $ (29,169)