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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 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.
| Six Months Ended June 30,
| 2018 |  | 2017
(Increase) decrease in: |  |  |
Accounts receivable | $ | 15,834 |  |  | $ | 3,666 |
Inventories | (1,436 | ) |  | 29,800 |
Deferred charges | (3,968 | ) |  | (93 | )
Other current assets | (2,024 | ) |  | (2,115 | )
Decrease in: |  |  |
Accounts payable | (26,596 | ) |  | (6,843 | )
Accrued liabilities | (15,965 | ) |  | (16,102 | )
Net changes in components of operating assets and liabilities | $ | (34,155 | ) |  | $ | 8,313 |

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