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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Operating Leases |  |  |
2012 | $ 8,793,000 |  |
2013 | 8,022,000 |  |
2014 | 6,076,000 |  |
2015 | 4,566,000 |  |
2016 | 3,776,000 |  |
Thereafter | 8,332,000 |  |
Operating leases | 39,565,000 |  |
Unconditional Purchase Obligations |  |  |
2012 | 102,164,000 |  |
2013 | 101,164,000 |  |
2014 | 101,244,000 |  |
2015 | 93,819,000 |  |
2016 | 94,155,000 |  |
Thereafter | 411,408,000 |  |
Unconditional purchase obligations | 903,954,000 |  |
Lease expenses | 5,100,000 | 5,100,000 | 5,100,000
Petroleum transportation service agreement with TransCanada | CRRM |  |  |
Unrecorded purchase agreements |  |  |
Amount payable related to petroleum transportation service agreements | $ 500,900,000 |  |
Term of agreement (in years) | 10 |  |
Minimum quantity of crude oil to be received per day (in barrels) | 25,000 |  |

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