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Commitments and Contingencies - Narrative (Details) Mcf in Millions |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 07, 2015 USD ($) | Apr. 05, 2011 USD ($) | Dec. 31, 2015 USD ($) $ / Mcf Mcf | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 26, 2014 director | Jul. 15, 2013 plaintiff | Mar. 31, 2013 claim | Mar. 06, 2013 claim
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total rental expense under operating leases |  |  | $ 1,000,000 | $ 1,700,000 | $ 3,600,000 |  |  |  |
Number of independent company directors that formed a Special Litigation Committee | director |  |  |  |  |  | 2 |  |  |
Number of claims consolidated by the court | claim |  |  |  |  |  |  |  |  | 2
Treating Agreement |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Contract agreement, term |  |  | 30 years |  |  |  |  |  |
Minimum delivery required (in Bcf) | Mcf |  |  | 3,200.0 |  |  |  |  |  |
Initial shortfall price, per Mcf (in dollars per mcf) | $ / Mcf |  |  | 0.25 |  |  |  |  |  |
Cumulative deliveries (in Bcf) | Mcf |  |  | 73.1 |  |  |  |  |  |
Cumulative shortfall (in Bcf) | Mcf |  |  | 439.6 |  |  |  |  |  |
Cumulative shortfall accrued |  |  | $ 109,900,000 |  |  |  |  |  |
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency, damages sought, value |  | $ 45,500,000 |  |  |  |  |  |  |
General Land Office of the State of Texas |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency, damages sought, value |  | $ 13,000,000 |  |  |  |  |  |  |
Shareholder Derivative Actions |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Number of putative shareholder derivative actions filed | claim |  |  |  |  |  |  |  | 7 |
Rig Commitments |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Minimum future commitments, 2016 |  |  | 2,500,000 |  |  |  |  |  |
Minimum future commitments, 2017 |  |  | 0 |  |  |  |  |  |
Federal Shareholder Derivative Litigation And Others | Pending Litigation |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Proposed escrow fund amount to be established by insurers of individual defendants to litigation settlement | $ 38,000,000 |  |  |  |  |  |  |  |
James Hart And Other Named Plaintiffs |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Number of additional plaintiffs | plaintiff |  |  |  |  |  |  | 15 |  |
Reserve established for lawsuit |  |  | $ 5,100,000 |  |  |  |  |  |

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