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Supplemental Information on Oil and Natural Gas Producing Activities - Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Acquisitions of properties      
Proved $ 73,370us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves $ 21,130us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves $ 1,761,556us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Unproved 123,649us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties 100,242us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties 377,185us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration 41,070us-gaap_CostsIncurredExplorationCosts [1] 82,775us-gaap_CostsIncurredExplorationCosts [1] 120,438us-gaap_CostsIncurredExplorationCosts [1]
Development 1,288,395us-gaap_CostsIncurredDevelopmentCosts [2] 1,131,269us-gaap_CostsIncurredDevelopmentCosts [2] 1,704,991us-gaap_CostsIncurredDevelopmentCosts [2]
Total cost incurred $ 1,526,484us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities $ 1,335,416us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities $ 3,964,170us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities
[1] Includes seismic costs of $10.8 million, $6.7 million and $15.3 million for 2014, 2013 and 2012, respectively.
[2] Includes the Company’s share of Century Plant construction costs of $50.0 million for 2012. See Note 7.