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Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2019
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.
| Three Months Ended March 31,
| 2019 |  | 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 | )

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