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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
(Increase) decrease in: |  |  |  |  |
Accounts receivable | $ | (140,948 | ) |  | $ | (9,859 | ) |  | $ | 99,384 |
Inventories | 49,055 |  |  | (54,361 | ) |  | 3,811 |
Deferred charges | (3,622 | ) |  | (3,902 | ) |  | (11,916 | )
Other current assets | (410 | ) |  | 3,059 |  |  | 6,417 |
Increase (decrease) in: |  |  |  |  |
Accounts payable | 97,569 |  |  | (17,426 | ) |  | (101,581 | )
Accrued liabilities | 8,512 |  |  | (8,161 | ) |  | 9,257 |
Net changes in components of operating assets and liabilities | $ | 10,156 |  |  | $ | (90,650 | ) |  | $ | 5,372 |

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