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Commitments and Contingencies - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items] |  |  |
Total rental expense under operating leases | $ 3,600,000 | $ 2,600,000 | $ 1,500,000
Permian Trust |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Development period deadline under development agreement latest date | Mar. 31, 2016 |  |
Mississippian Trust II |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Development period deadline under development agreement latest date | Dec. 31, 2016 |  |
Permian Trust and Mississippian Trust II |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Estimated remaining drilling obligation | 137,000,000 |  |
Gas Gathering Agreement | Pinon Gathering Company LLC |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Agreement expiration date | Jun. 30, 2029 |  |
Treating Agreement |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Contract agreement, term | 30 years |  |
Minimum delivery required (in Bcf) | 3,200 |  |
Estimated minimum delivery required remaining (in Bcf) | 3,000 |  |
Initial shortfall price, per Mcf | 0.25 |  |
Shortfall price, per Mcf, final year of agreement | 0.70 |  |
Accrued shortfall | 32,700,000 |  |
Treating Agreement | Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Range of projected shortfall in one year | 30,000,000 |  |
Treating Agreement | Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Range of projected shortfall in one year | 37,000,000 |  |
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 | 16,000,000 |  |
General Land Office of the State of Texas |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Loss contingency, damages sought, value | 13,000,000 |  |
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Loss contingency, damages sought, value | 45,500,000 |  |
Rig Commitments |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Minimum future commitments, 2014 | 20,300,000 |  |
Minimum future commitments, 2015 | $ 1,100,000 |  |

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- Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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