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Supplemental Gas Data Oil and Gas Expenditures (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |  |
Proven properties | $ 0 us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves | $ 0 us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves | $ 50,005 us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
Unproven properties | 119,597 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties | 260,477 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties | 28,634 us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
Development | 952,733 us-gaap_CostsIncurredDevelopmentCosts | 629,100 us-gaap_CostsIncurredDevelopmentCosts | 339,608 us-gaap_CostsIncurredDevelopmentCosts
Exploration | 45,006 us-gaap_CostsIncurredExplorationCosts | 95,413 us-gaap_CostsIncurredExplorationCosts | 130,312 us-gaap_CostsIncurredExplorationCosts
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities | $ 1,117,336 us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities | $ 984,990 us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities | $ 548,559 us-gaap_CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities

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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62038-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Exploration -URI http://asc.fasb.org/extlink&oid=6512329 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense. + References No definition available. + Details
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