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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Acquisitions of properties      
Proved $ 21,130us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves $ 1,761,556us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves $ 58,190us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Unproved 100,242us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties 377,185us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties 320,361us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Exploration(1) 82,775us-gaap_CostsIncurredExplorationCosts [1] 120,438us-gaap_CostsIncurredExplorationCosts [1] 98,849us-gaap_CostsIncurredExplorationCosts [1]
Development(2) 1,131,269us-gaap_CostsIncurredDevelopmentCosts [2] 1,704,991us-gaap_CostsIncurredDevelopmentCosts [2] 1,296,903us-gaap_CostsIncurredDevelopmentCosts [2]
Total costs incurred $ 1,335,416us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities $ 3,964,170us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities $ 1,774,303us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities
[1] Includes seismic costs of $6.7 million, $15.3 million and $4.9 million for 2013, 2012 and 2011, respectively.
[2] Includes Company’s share of Century Plant construction costs of $50.0 million and $25.0 million for 2012 and 2011, respectively. See Note 8.