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Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2021
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,
| 2021 |  | 2020
(Increase) decrease in: |  |  |
Accounts receivable | $ | (99,504) |  |  | $ | 101,405 |
Inventories | 27,450 |  |  | (5,024) |
Deferred charges | 7,731 |  |  | 2,783 |
Other current assets | (2,294) |  |  | (3,746) |
Increase (decrease) in: |  |  |
Accounts payable | 38,994 |  |  | (62,365) |
Accrued liabilities | 22,561 |  |  | (25,519) |
Net changes in components of operating assets and liabilities | $ | (5,062) |  |  | $ | 7,534 |

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