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Supplemental Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract] |
Net Changes In Components of Operating Assets and Liabilities | The following table provides information regarding the net changes in components of operating assets and liabilities.
| Nine Months Ended September 30,
| 2018 |  | 2017
(Increase) decrease in: |  |  |
Accounts receivable | $ | 87,318 |  |  | $ | (79,938 | )
Inventories | 9,159 |  |  | 31,973 |
Deferred charges | (4,899 | ) |  | (293 | )
Other current assets | (1,798 | ) |  | (2,769 | )
(Decrease) increase in: |  |  |
Accounts payable | (68,974 | ) |  | 32,896 |
Accrued liabilities | 6,524 |  |  | (8,131 | )
Net changes in components of operating assets and liabilities | $ | 27,330 |  |  | $ | (26,262 | )

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