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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, 2020
Sep. 30, 2019
(Increase) decrease in:    
Accounts receivable $ 165,505 $ 6,294
Inventories (24,674) 709
Deferred charges 17,616 135
Other current assets (1,620) (10,358)
Increase (decrease) in:    
Accounts payable (59,477) 46,530
Accrued liabilities (25,204) (48,954)
Net changes in components of operating assets and liabilities $ 72,146 $ (5,644)