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v2.4.1.9

Properties and Equipment (Details 2) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014
Properties and Equipment |  |  |  |
Impairment of oil and gas properties | $ 771,037,000 us-gaap_ImpairmentOfOilAndGasProperties | $ 0 us-gaap_ImpairmentOfOilAndGasProperties | $ 0 us-gaap_ImpairmentOfOilAndGasProperties |
Oil and Gas Properties | Significant Unobservable Inputs (Level 3) |  |  |  |
Properties and Equipment |  |  |  |
Capital rate |  |  |  | 10.00%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember
East And South Texas |  |  |  |
Properties and Equipment |  |  |  |
Fair value of oil and gas properties subject to impairment | $ 86,500,000 cog_OilAndGasPropertySuccessfulEffortMethodSubjectToImpairmentFairValue / us-gaap_StatementGeographicalAxis = cog_EastAndSouthTexasMember |  |  | 86,500,000 cog_OilAndGasPropertySuccessfulEffortMethodSubjectToImpairmentFairValue / us-gaap_StatementGeographicalAxis = cog_EastAndSouthTexasMember

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- Definition Oil And Gas Property, Successful Effort Method, Subject To Impairment, Fair Value + References No definition available. + Details
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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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