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Commitments and Contingencies (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Minimum | Dec. 31, 2012 Minimum | Dec. 31, 2011 Maximum | Dec. 31, 2012 Maximum
Natural gas and liquids transportation agreements initial term |  |  |  |  | 4 years |  | 23 years
2013 | $ 94,714,000 |  |  |  |  |  |
2014 | 98,145,000 |  |  |  |  |  |
2015 | 115,203,000 |  |  |  |  |  |
2016 | 126,973,000 |  |  |  |  |  |
2017 | 121,923,000 |  |  |  |  |  |
Thereafter | 1,156,294,000 |  |  |  |  |  |
Future minimum obligations of natural gas and liquids transportation agreements | 1,713,252,000 |  |  |  |  |  |
Drilling Rig Commitments |  |  |  |  |  |  |
Drilling rig commitment term |  |  |  | 2 years |  | 3 years |
Drilling Rig Commitments |  |  |  |  |  |  |
2013 | 17,900,000 |  |  |  |  |  |
2014 | 9,200,000 |  |  |  |  |  |
Lease Commitments |  |  |  |  |  |  |
Rent expense | 11,600,000 | 13,600,000 | 18,300,000 |  |  |  |
Future minimum rental commitments under non-cancelable leases |  |  |  |  |  |  |
2013 | 5,106,000 |  |  |  |  |  |
2014 | 4,652,000 |  |  |  |  |  |
2015 | 3,624,000 |  |  |  |  |  |
2016 | 730,000 |  |  |  |  |  |
2017 | 192,000 |  |  |  |  |  |
Aggregate future minimum rental commitments | $ 14,304,000 |  |  |  |  |  |

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