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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract] |
Net Changes In Components Of Operating Assets And Liabilities |
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
(Increase) decrease in: |  |  |  |  |
Accounts receivable | $ | (34,299 | ) |  | $ | (66,208 | ) |  | $ | (41,648 | )
Inventories | 14,074 |  |  | (46,151 | ) |  | (16,870 | )
Other current assets | (9,593 | ) |  | (3,598 | ) |  | (4,036 | )
Increase (decrease) in: |  |  |  |  |
Accounts payable | 53,146 |  |  | 33,049 |  |  | 47,401 |
Accrued liabilities | (10,263 | ) |  | 15,977 |  |  | 9,666 |
Net changes in components of operating assets and liabilities | $ | 13,065 |  |  | $ | (66,931 | ) |  | $ | (5,487 | )

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