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Commitments and Contingencies - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating Leases |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Total rental expense under operating leases | $ 2,600,000 | $ 1,500,000 | $ 2,600,000
Rig Commitments |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Minimum future commitments, 2013 | 44,200,000 |  |
Minimum future commitments, 2014 | 9,700,000 |  |
Hyrdaulic Services Agreements |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Termination fee | 33,400,000 |  |
Gas Gathering Agreement |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Minimum future commitments, 2013 | 42,634,000 |  |
Minimum future commitments, 2014 | 42,360,000 |  |
Treating Agreement |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Contract agreement, term | 30 years |  |
Minimum delivery required (in Bcf) | 3,200 |  |
Accrued shortfall | 8,500,000 |  |
Treating Agreement | Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Range of projected shortfall in one year | 29,500,000 |  |
Treating Agreement | Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Range of projected shortfall in one year | 36,000,000 |  |
Aspen Pipeline, II, L.P. |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Damages sought by plaintiff | 100,000,000 |  |
Settlement amount | 20,000,000 |  |
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Damages sought by plaintiff | 45,500,000 |  |
General Land Office of the State of Texas |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Damages sought by plaintiff | 13,000,000 |  |
Patriot Exploration, LLC, Jonathan Feldman, Redwing Drilling Partners, Mapleleaf Drilling Partners, Avalanche Drilling Partners, Penguin Drilling Partners and Gramax Insurance Company Ltd. |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Plaintiffs investment under participation agreement | 15,000,000 |  |
Pinon Gathering Company LLC | Gas Gathering Agreement |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Agreement expiration date | Jun. 30, 2029 |  |
Grey Ranch Plant, L.P |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Insurance recoveries from damages caused by the fire | 24,500,000 |  |
Ownership interest | 50.00% |  |
Estimate of reasonably possible losses for claims associated with Grey Ranch Plant | $ 1,100,000 |  |

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