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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, 2019
Mar. 31, 2018
(Increase) decrease in:    
Accounts receivable $ 18,170 $ 27,368
Inventories (6,616) (4,469)
Deferred charges (4,092) (4,161)
Other current assets (5,067) (7,694)
(Decrease) increase in:    
Accounts payable 5,226 94
Accrued liabilities (4,421) (14,920)
Net changes in components of operating assets and liabilities $ 3,200 $ (3,782)