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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash paid for: |  |  |
Interest | $ 21,257 | $ 19,809 | $ 28,383
Income/withholding taxes | 64,622 | 6,481 | 5,009
Non-cash investing activities: |  |  |
Accrued capital costs | 1,041 | 172 | 10,579
Non-Cash Activities [Abstract] |  |  |
Incurred expense for contingent obligation |  | 13,091 |
Non-cash change in inventory |  |  | 18,023
Performance shares Liability | $ 0 | $ 1,050 | $ 694

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