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Commitments and Contingencies (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2015
Lease Commitments |  |  |  |
Rent expense | $ 10,800,000 us-gaap_LeaseAndRentalExpense | $ 12,300,000 us-gaap_LeaseAndRentalExpense | $ 11,600,000 us-gaap_LeaseAndRentalExpense |
Future minimum rental commitments under non-cancelable leases |  |  |  |
2015 | 5,818,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |  |
2016 | 3,469,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |  |
2017 | 2,873,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |  |
2018 | 2,312,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |  |
2019 | 1,877,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |  |
Thereafter | 9,464,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |  |
Aggregate future minimum rental commitments | 25,813,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |  |
Transportation and Gathering Agreements |  |  |  |
Future minimum obligations under transportation and gathering |  |  |  |
2015 | 130,411,000 cog_FutureMinimumObligationsTransportationAgreementFirstFullFiscalYear / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember |  |  |
2016 | 161,675,000 cog_FutureMinimumObligationsTransportationAgreementSecondFullFiscalYear / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember |  |  |
2017 | 163,573,000 cog_FutureMinimumObligationsTransportationAgreementThirdFullFiscalYear / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember |  |  |
2018 | 138,917,000 cog_FutureMinimumObligationsTransportationAgreementFourthFullFiscalYear / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember |  |  |
2019 | 129,245,000 cog_FutureMinimumObligationsTransportationAgreementFifthFullFiscalYear / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember |  |  |
Thereafter | 1,226,791,000 cog_FutureMinimumObligationsTransportationAgreementThereafter / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember |  |  |
Future minimum obligations under transportation and gathering | 1,950,612,000 cog_AggregateFutureMinimumTransportationAgreementObligation / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember |  |  |
Drilling Rig Commitments |  |  |  |
Drilling Rig Commitments |  |  |  |
Number of drilling rig commitments | 3 cog_NumberOfDrillingRigCommitments / us-gaap_OtherCommitmentsAxis = cog_DrillingRigObligationMember |  |  |
Drilling Rig Commitments |  |  |  |
2015 | 14,400,000 us-gaap_ContractualObligationDueInNextTwelveMonths / us-gaap_OtherCommitmentsAxis = cog_DrillingRigObligationMember |  |  |
2016 | 7,000,000 us-gaap_ContractualObligationDueInSecondYear / us-gaap_OtherCommitmentsAxis = cog_DrillingRigObligationMember |  |  |
Drilling Rig Commitments | Minimum |  |  |  |
Drilling Rig Commitments |  |  |  |
Drilling rig commitment term | 2 years |  |  |
Drilling Rig Commitments | Maximum |  |  |  |
Drilling Rig Commitments |  |  |  |
Drilling rig commitment term | 3 years |  |  |
Subsequent event | Transportation and Gathering Agreements |  |  |  |
Other transportation and gathering commitments disclosure |  |  |  |
Increase in future aggregate obligations under transportation commitments |  |  |  | $ 105,900,000 cog_AggregateFutureMinimumTransportationAgreementObligationIncreaseInCommitmentAmount / us-gaap_OtherCommitmentsAxis = cog_TransportationAgreementObligationMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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