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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 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.
| Six Months Ended June 30,
| 2021 |  | 2020
(Increase) decrease in: |  |  |
Accounts receivable | $ | (77,785) |  |  | $ | 178,509 |
Inventories | 21,550 |  |  | (44,394) |
Deferred charges | 9,823 |  |  | 9,240 |
Other current assets | (4,835) |  |  | (9,919) |
Increase (decrease) in: |  |  |
Accounts payable | 49,809 |  |  | (93,080) |
Accrued liabilities | 32,710 |  |  | (20,838) |
Net changes in components of operating assets and liabilities | $ | 31,272 |  |  | $ | 19,518 |

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