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Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2013
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,
| 2013 |  | 2012
(Increase) decrease in: |  |  |
Accounts receivable | $ | (85,915 | ) |  | $ | (55,904 | )
Inventories | 7,947 |  |  | (2,307 | )
Other current assets | 4,736 |  |  | (2,327 | )
Increase (decrease) in: |  |  |
Accounts payable | 57,048 |  |  | 52,055 |
Accrued liabilities | 6,019 |  |  | (8,785 | )
Net changes in components of operating assets and liabilities | $ | (10,165 | ) |  | $ | (17,268 | )

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