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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2011
Supplemental Cash Flow Information [Abstract] |
Supplemental Cash Flow Information |
|  | Year Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 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 |

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