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Stock-Based Compensation (Details 4) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
2012 Hybrid Performance Share Awards | Percent vesting on first year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period |  |  |  |  | 33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2012HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember |
2012 Hybrid Performance Share Awards | Percent vesting on second year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period |  |  |  |  | 33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2012HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember |
2012 Hybrid Performance Share Awards | Percent vesting on third year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period |  |  |  |  | 33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2012HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheThreeMember |
2013 Hybrid Performance Share Awards | Percent vesting on first year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2013HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember |  |  |
2013 Hybrid Performance Share Awards | Percent vesting on second year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2013HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember |  |  |
2013 Hybrid Performance Share Awards | Percent vesting on third year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period |  |  | 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2013HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheThreeMember |  |  |
2014 Hybrid Performance Share Awards | Percent vesting on first year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2014HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember |  |  |  |  |
2014 Hybrid Performance Share Awards | Percent vesting on second year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2014HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember |  |  |  |  |
2014 Hybrid Performance Share Awards | Percent vesting on third year anniversary |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Percent vesting per anniversary period | 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_PlanNameAxis = cog_A2014HybridPerformanceShareAwardsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheThreeMember |  |  |  |  |
Performance Share Awards |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Number of types of performance awards granted to employees | 3 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfEquityInstrumentsOtherThanOptionsGranted / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |  |  |
Performance period | 3 years |  |  |  |  |
Performance Share Awards | Low end of range |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Annual forfeiture rate assumption (as a percent) | 0.00%cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Performance Share Awards | High end of range |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Annual forfeiture rate assumption (as a percent) | 6.00%cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Performance shares based on performance conditions |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Number of types of performance awards granted to employees | 2 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfEquityInstrumentsOtherThanOptionsGranted / us-gaap_AwardTypeAxis = cog_InternalMetricsPerformanceShareAwardsMember |  |  |  |  |
Performance shares based on performance conditions | High end of range |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Right to receive shares (as a percent) | 100.00%cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveShares / us-gaap_AwardTypeAxis = cog_InternalMetricsPerformanceShareAwardsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Employee Performance Share Awards |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Performance period | 3 years |  |  |  |  |
Vesting rights | An employee will earn one-third of the award for each of the three performance metrics that the Company meets |  |  |  |  |
Summary of employee performance share awards activity (in shares) |  |  |  |  |  |
Outstanding at beginning of period | 1,657,980 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | 1,919,640 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | 2,627,900 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Granted | 241,130 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | 379,540 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | 567,360 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Issued and fully vested | (751,780)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | (610,960)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | (1,189,920)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Forfeited | (58,370)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | (30,240)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | (85,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Outstanding at end of period | 1,088,960 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | 1,657,980 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | 1,919,640 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Weighted-Average Grant Date Fair Value per Share (in usd per share) |  |  |  |  |  |
Outstanding at beginning of period | $ 16.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 12.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 8.12 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Granted | $ 39.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 26.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 17.59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Issued and fully vested | $ 10.19 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 10.13 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 5.66 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Forfeited | $ 23.57 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 17.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 12.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Outstanding at end of period | $ 25.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 16.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |  | $ 12.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_EmployeePerformanceSharesMember |
Hybrid Performance Share Awards |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Performance period | 3 years |  |  |  |  |
Vesting rights | The 2013 awards vest 25% on each of the first and second anniversary dates and 50% on the third anniversary and the 2012 and 2011 awards vest one-third on each anniversary date |  |  |  |  |
Minimum operating cash flow for the year preceding the performance period | $ 100,000,000 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMinimumOperatingCashFlowRequirement / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  |  |  |  |
Summary of employee performance share awards activity (in shares) |  |  |  |  |  |
Outstanding at beginning of period | 450,212 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | 592,162 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | 759,328 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Granted | 123,257 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | 169,980 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | 234,922 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Issued and fully vested | (244,408)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | (311,930)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | (402,088)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Outstanding at end of period | 329,061 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | 450,212 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | 592,162 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Weighted-Average Grant Date Fair Value per Share (in usd per share) |  |  |  |  |  |
Outstanding at beginning of period | $ 18.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 13.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 9.16 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Granted | $ 39.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 26.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 17.59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Issued and fully vested | $ 15.41 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 12.03 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 8.27 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Outstanding at end of period | $ 29.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 18.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |  | $ 13.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_HybridPerformanceSharesMember |
Performance shares based on market conditions |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Number of types of performance awards granted to employees | 1 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfEquityInstrumentsOtherThanOptionsGranted / us-gaap_AwardTypeAxis = cog_MarketBasedPerformanceShareAwardsMember |  |  |  |  |
Performance shares based on market conditions | High end of range |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Right to receive shares (as a percent) | 100.00%cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveShares / us-gaap_AwardTypeAxis = cog_MarketBasedPerformanceShareAwardsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Right to receive additional shares (as a percent) | 100.00%cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveAdditionalShares / us-gaap_AwardTypeAxis = cog_MarketBasedPerformanceShareAwardsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
TSR Performance Share Awards |  |  |  |  |  |
Stock-Based Compensation arrangements |  |  |  |  |  |
Performance period | 3 years |  |  |  |  |
Summary of employee performance share awards activity (in shares) |  |  |  |  |  |
Outstanding at beginning of period | 860,686 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 605,706 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 1,495,904 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |
Granted | 184,885 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 254,980 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 234,922 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |
Issued and fully vested | (370,784)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 0 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | (1,125,120)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |
Outstanding at end of period | 674,787 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 860,686 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 605,706 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |
Weighted-Average Grant Date Fair Value per Share (in usd per share) |  |  |  |  |  |
Outstanding at beginning of period | $ 14.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 10.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 6.07 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1]
Granted | $ 32.04 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 23.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 14.16 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1]
Issued and fully vested | $ 7.81 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 0.00 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 5.49 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1]
Outstanding at end of period | $ 22.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 14.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1] | $ 10.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember | [1]
General information on stock-based compensation |  |  |  |  |  |
Cash payment | 7,000,000 cog_DeferredCompensationShareBasedArrangementsCashPayments / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 0 cog_DeferredCompensationShareBasedArrangementsCashPayments / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |  | 18,400,000 cog_DeferredCompensationShareBasedArrangementsCashPayments / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember |
TSR Performance Share Awards | Equity Component |  |  |  |  |  |
Assumptions |  |  |  |  |  |
Fair value per performance share award granted during the period (usd per share) | $ 32.04 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | $ 23.06 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | $ 14.16 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |
Stock price volatility | 41.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | 43.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | 46.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |
Risk free rate of return | 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |
Expected dividend yield (as a percent) | 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |  | 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_ShareholdersEquityMember |
TSR Performance Share Awards | Liability Component |  |  |  |  |  |
General information on stock-based compensation |  |  |  |  |  |
Non-current portion of the liability , included in Other Liabilities | 4,000,000 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 7,800,000 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  |  |
Current portion of the liability, included in Other Liabilities | $ 7,000,000 us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | $ 14,300,000 us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  |  |
Assumptions |  |  |  |  |  |
Expected dividend yield (as a percent) | 0.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |
Stock price volatility, minimum | 29.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 30.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 41.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |
Stock price volatility, maximum | 29.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 35.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 45.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |
Risk free rate of return, minimum | 0.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |
Risk free rate of return, maximum | 0.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |  | 0.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember |
TSR Performance Share Awards | Low end of range | Liability Component |  |  |  |  |  |
Assumptions |  |  |  |  |  |
Fair value per performance share award granted during the period (usd per share) | $ 12.88 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | $ 23.96 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | $ 19.11 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
TSR Performance Share Awards | High end of range | Liability Component |  |  |  |  |  |
Assumptions |  |  |  |  |  |
Fair value per performance share award granted during the period (usd per share) | $ 29.72 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | $ 38.61 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | $ 24.76 cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue / us-gaap_AwardTypeAxis = cog_TSRPerformanceSharesMember / us-gaap_BalanceSheetLocationAxis = us-gaap_LiabilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
[1] | The grant date fair value figures in this table represent the fair value of the equity component of the performance share awards.

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