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Commitments and Contingencies (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Operating Leases |  |
Nine months ending, 2012 | $ 7,342,000 |
Year ending, 2013 | 8,900,000 |
Year ending, 2014 | 6,951,000 |
Year ending, 2015 | 5,393,000 |
Year ending 31, 2016 | 4,471,000 |
Thereafter | 8,455,000 |
Operating leases | 41,512,000 |
Unconditional Purchase Obligations |  |
Nine months ending, 2012 | 92,276,000 |
Year ending, 2013 | 123,478,000 |
Year ending, 2014 | 117,694,000 |
Year ending, 2015 | 110,270,000 |
Year ending 31, 2016 | 110,605,000 |
Thereafter | 438,029,000 |
Unconditional purchase obligations | 992,352,000 |
Lease expenses | 1,300,000 | 1,300,000
Petroleum transportation service agreement with TransCanada | CRRM |  |
Unrecorded purchase agreements |  |
Amount payable related to petroleum transportation service agreements | $ 486,800,000 |
Term of agreement (in years) | 9 |
Minimum quantity of crude oil to be received per day (in barrels) | 25,000 |
Period over which minimum quantity of crude oil is receivable (in years) | 10 years |

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