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FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy |  |
Balance at beginning of period | $ 41,159 | $ 195,127
Total Gains or (Losses) (Realized or Unrealized): |  |
Included in Earnings | 13,328 | 57,038
Included in Other Comprehensive Income | (71,058) | 22,692
Settlements | (13,328) | (56,300)
Transfers In and/or Out of Level 3 |  | 385
Balance at end of period | (29,899) | 218,942
Natural Gas Revenues |  |
Derivative disclosures |  |
Unrealized gain (loss) included in natural gas revenues | $ 0 | $ 42

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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity). + References No definition available. + Details
Name: | cog_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInOtherComprehensiveIncome
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- Definition Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | cog_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilitySettlements
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Balance Type: | credit
Period Type: | duration

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- Definition This element represents [net] transfers in to and out of assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
Name: | cog_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityTransfersNet
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition This element represents the net asset (liability) measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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