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Commitments and Contingencies (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Operating Leases |  |  |  |
Six months ending, 2012 | $ 5,065,000 |  | $ 5,065,000 |
Year ending, 2013 | 9,093,000 |  | 9,093,000 |
Year ending, 2014 | 7,145,000 |  | 7,145,000 |
Year ending, 2015 | 5,586,000 |  | 5,586,000 |
Year ending, 2016 | 4,664,000 |  | 4,664,000 |
Thereafter | 8,563,000 |  | 8,563,000 |
Operating leases | 40,116,000 |  | 40,116,000 |
Unconditional Purchase Obligations |  |  |  |
Six months ending, 2012 | 63,994,000 |  | 63,994,000 |
Year ending, 2013 | 126,619,000 |  | 126,619,000 |
Year ending, 2014 | 113,593,000 |  | 113,593,000 |
Year ending, 2015 | 103,115,000 |  | 103,115,000 |
Year ending, 2016 | 103,013,000 |  | 103,013,000 |
Thereafter | 457,896,000 |  | 457,896,000 |
Unconditional purchase obligations | 968,230,000 |  | 968,230,000 |
Lease expenses | 1,400,000 | 1,300,000 | 2,700,000 | 2,600,000
Petroleum transportation service agreement with TransCanada | CRRM |  |  |  |
Unrecorded purchase agreements |  |  |  |
Amount payable related to petroleum transportation service agreements | $ 497,800,000 |  | $ 497,800,000 |
Term of agreement (in years) |  |  | 9 |
Minimum quantity of crude oil to be received per day (in barrels) | 25,000 |  | 25,000 |
Period over which minimum quantity of crude oil is receivable (in years) |  |  | 10 years |

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