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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current |  |  |
Federal | $ 44,887,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 56,544,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 24,618,000 us-gaap_CurrentFederalTaxExpenseBenefit
State | (4,387,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 10,841,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 563,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total | 40,500,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 67,385,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 25,181,000 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred |  |  |
Federal | (32,375,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 111,147,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 57,704,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State | (80,192,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 27,233,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 23,225,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total | (112,567,000)us-gaap_DeferredIncomeTaxExpenseBenefit | 138,380,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 80,929,000 us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (benefit) expense | (72,067,000)us-gaap_IncomeTaxExpenseBenefit | 205,765,000 us-gaap_IncomeTaxExpenseBenefit | 106,110,000 us-gaap_IncomeTaxExpenseBenefit
Reconciliation of actual provision for income taxes and provision for income taxes resulting from the use of federal statutory income tax |  |  |
Statutory federal income tax rate (as a percent) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Computed expected federal income tax | 11,341,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 169,938,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 83,244,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Deferred tax adjustment related to change in overall state tax rate | (86,956,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 15,220,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 13,596,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income tax, net of federal income tax benefit | 903,000 cog_IncomeTaxReconciliationDeferredTaxAdjustmentRelatedToChangeInOverallStateTaxRate | 17,513,000 cog_IncomeTaxReconciliationDeferredTaxAdjustmentRelatedToChangeInOverallStateTaxRate | 9,609,000 cog_IncomeTaxReconciliationDeferredTaxAdjustmentRelatedToChangeInOverallStateTaxRate
Valuation allowance | 3,977,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 262,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Uncertain tax positions | (1,974,000)cog_EffectiveIncomeTaxRateReconciliationUncertainTaxPositions | 2,400,000 cog_EffectiveIncomeTaxRateReconciliationUncertainTaxPositions | 0 cog_EffectiveIncomeTaxRateReconciliationUncertainTaxPositions
Other, net | 642,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 694,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | (601,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax (benefit) expense | (72,067,000)us-gaap_IncomeTaxExpenseBenefit | 205,765,000 us-gaap_IncomeTaxExpenseBenefit | 106,110,000 us-gaap_IncomeTaxExpenseBenefit
Deferred Tax Assets |  |  |
Net operating loss carryforward | 141,961,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 78,182,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Alternative minimum tax carryforward | 227,719,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 182,212,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |
Foreign tax credit | 4,525,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 4,822,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
Derivative instruments | 0 cog_DeferredTaxAssetsDerivativeAndHedgingTransactions | 3,946,000 cog_DeferredTaxAssetsDerivativeAndHedgingTransactions |
Incentive compensation | 21,961,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | 36,450,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation |
Deferred compensation | 9,531,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 11,988,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
Post-retirement benefits | 13,689,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 13,965,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits |
Other | 747,000 us-gaap_DeferredTaxAssetsOther | 3,619,000 us-gaap_DeferredTaxAssetsOther |
Total | 420,133,000 us-gaap_DeferredTaxAssetsNet | 335,184,000 us-gaap_DeferredTaxAssetsNet |
Deferred Tax Liabilities |  |  |
Properties and equipment | 1,248,532,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 1,321,241,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Deferred Tax Liabilities, Derivatives | 50,750,000 us-gaap_DeferredTaxLiabilitiesDerivatives | 0 us-gaap_DeferredTaxLiabilitiesDerivatives |
Total | 1,299,282,000 us-gaap_DeferredTaxLiabilities | 1,321,241,000 us-gaap_DeferredTaxLiabilities |
Net deferred tax liabilities | 879,149,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 986,057,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |
State tax effected net operating losses |  |  |
Tax benefits related to employee stock-based compensation not reflected in deferred tax assets | 108,600,000 cog_EmployeeServiceSharebasedCompensationTaxBenefitIncludedInOperatingLossCarryforwardButNotReflectedInDeferredTaxAssets |  |
Reconciliation of unrecognized tax benefits |  |  |
Balance at beginning of year | 3,700,000 us-gaap_UnrecognizedTaxBenefits | 0 us-gaap_UnrecognizedTaxBenefits | 0 us-gaap_UnrecognizedTaxBenefits
Additions based on tax provisions related to the current year | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 3,700,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for tax positions of prior years | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions of prior years | (3,037,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Settlements | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities
Balance at end of year | 663,000 us-gaap_UnrecognizedTaxBenefits | 3,700,000 us-gaap_UnrecognizedTaxBenefits | 0 us-gaap_UnrecognizedTaxBenefits
State Tax Reporting |  |  |
State tax effected net operating losses |  |  |
Net operating loss carryforwards | 483,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Federal |  |  |
State tax effected net operating losses |  |  |
Net operating loss carryforwards | $ 399,800,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |

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