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Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2012
Supplemental Cash Flow Information [Abstract] |
Net Changes In Components Of Operating Assets And Liabilities |
|  | Three Months Ended March 31, |
|  | 2012 |  |  | 2011 |
(Increase) decrease in: |  |  |  |  |  |  |  |
Accounts receivable |  | $ | (55,904 | ) |  | $ | (96,899 | )
Inventories |  |  | (2,307 | ) |  |  | 20,211 |
Other current assets |  |  | (2,327 | ) |  |  | (7,890 | )
Increase (decrease) in: |  |  |  |  |  |  |  |
Accounts payable |  |  | 52,055 |  |  |  | 51,249 |
Accrued liabilities |  |  | (8,785 | ) |  |  | 607 |
Net changes in components of operating assets and liabilities |  | $ | (17,268 | ) |  | $ | (32,722 | )

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