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Commitments and Contingencies - Narrative (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 07, 2015 USD ($) | Apr. 05, 2011 USD ($) | Sep. 30, 2015 USD ($) bcf $ / Mcf | Sep. 30, 2015 USD ($) bcf $ / Mcf | Dec. 31, 2014 USD ($) bcf $ / Mcf | Mar. 31, 2013 claim
James Hart And Other Named Plaintiffs |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Litigation reserve established |  |  | $ 5.1 | $ 5.1 |  |
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Damages sought by plaintiff |  | $ 45.5 |  |  |  |
General Land Office of the State of Texas |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Damages sought by plaintiff |  | $ 13.0 |  |  |  |
Shareholder Derivative Actions |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Number of shareholder derivative actions claims filed | claim |  |  |  |  |  | 7
Treating Agreement |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Contract agreement, term |  |  |  | 30 years |  |
Minimum delivery required (in Bcf) | bcf |  |  | 3,200 | 3,200 |  |
Initial shortfall price (usd per Mcf) | $ / Mcf |  |  | 0.25 | 0.25 |  |
Delivery made (in Bcf) | bcf |  |  |  |  | 54.7 |
Delivery shortfall (in Bcf) | bcf |  |  |  |  | 300.1 |
Cumulative shortfall accrued |  |  | $ 101.0 | $ 101.0 | $ 75.0 |
Final shortfall price (usd per Mcf) | $ / Mcf |  |  | 0.70 | 0.70 | 0.70 |
Final shortfall, if not delivered in future periods |  |  | $ 100.7 | $ 100.7 | $ 210.1 |
Shortfall amount accrued |  |  | 8.8 | 26.0 |  |
Annual minimum delivery requirement shortfall. 2012 to 2019, assuming no deliveries subsequent to balance sheet date |  |  | 289.1 | 289.1 |  |
Delivery requirement reduction payment |  |  | 290.1 | 290.1 |  |
Treating Agreement | Minimum |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Projected shortfall amount |  |  | 31.0 | 31.0 |  |
Treating Agreement | Maximum |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Projected shortfall amount |  |  | $ 38.0 | $ 38.0 |  |
Pending Litigation | Subsequent Event | Federal Shareholder Derivative Litigation And Others |  |  |  |  |  |
Commitments and Contingencies Disclosure |  |  |  |  |  |
Escrow fund amount established | $ 38.0 |  |  |  |  |

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