XML 88 R73.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Employee Benefit Plans - Narrative (Details) | 1 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2017 | Oct. 31, 2017 | Dec. 31, 2017 USD ($) Retiree employee shares | Dec. 31, 2016 USD ($) Retiree shares | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of retirees and dependents | Retiree |  |  | 340 | 310 |
Subsidy limit percentage of expected annual fully insured premium over age threshold |  |  | 60.00% |  |
Subsidy limit percentage of expected annual fully insured premium under age threshold |  |  | $ 648,000 |  |
Annual subsidy limit percentage increases for fully insured premium over age threshold |  |  | 3.50% |  |
Estimated contributions in 2016 |  |  | $ 1,700,000 |  |
Liabilities, including the Company's common stock |  |  | 29,145,000 | $ 24,169,000 |
Defined contribution cost (credit) recognized |  |  | $ 2,600,000 | 1,800,000 | $ (6,400,000)
Savings Investment Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer matching percent |  |  | 6.00% |  |
Maximum contribution, percent of employee salary | 10.00% | 9.00% |  |  |
Plan contributions charged to expense |  |  | $ 6,500,000 | 6,500,000 | 7,100,000
Deferred compensation plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Market value of the trust assets, excluding the Company's common stock |  |  | 15,000,000 | 12,600,000 |
Liabilities, including the Company's common stock |  |  | $ 29,100,000 | $ 24,200,000 |
Number of common stock deferred into the rabbi trust (in shares) | shares |  |  | 495,774 | 495,774 |
Company's common stock held in the rabbi trust |  |  | $ 5,100,000 | $ 5,100,000 |
Company contributions to deferred compensation plan |  |  | $ 1,000,000 | $ 600,000 | $ 1,000,000
West Virginia, Virginia, and Ohio |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employees terminated | employee |  |  | 100 |  |

X
- Definition Represents the number of common stock representing vested performance share awards that were deferred into the rabbi trust. + References No definition available. + Details
Name: | cog_CommonStockSharesVestedPerformanceShareAwardsHeldInEmployeeTrustShares
Namespace Prefix: | cog_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the market value of the trust assets, excluding the entity's common stock. + References No definition available. + Details
Name: | cog_DeferredCompensationMarketValueOfAssetsExcludingCommonStock
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of retired employees, including their spouses, eligible dependents and surviving spouses (retirees), to whom Company provides benefits under the plan. + References No definition available. + Details
Name: | cog_DefinedBenefitPlanNumberOfRetireesAndDependents
Namespace Prefix: | cog_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent the percentage of annual increase in subsidy limit. + References No definition available. + Details
Name: | cog_DefinedBenefitPlanSubsidyLimitPercentageOfAnnualIncreaseUnderAgeThreshold
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the entity's subsidy which is limited to the percentage of the expected annual fully-insured premium. + References No definition available. + Details
Name: | cog_DefinedBenefitPlanSubsidyLimitPercentageOfExpectedAnnualFullyInsuredPremiumOverAgeThreshold
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the entity's subsidy limit which should not exceed aggregate annual amount. + References No definition available. + Details
Name: | cog_DefinedBenefitPlanSubsidyLimitPercentageOfExpectedAnnualFullyInsuredPremiumUnderAgeThreshold
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the plan contributions that are charged to expense. + References No definition available. + Details
Name: | cog_DefinedContributionPlanCostRecognizedDiscretionary
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | cog_DefinedContributionPlanMaximumAnnualContributionsPerEmployerPercent
Namespace Prefix: | cog_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19850-108362 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19833-108362 + Details
Name: | us-gaap_CommonStockIssuedEmployeeTrustDeferred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in cost for defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanIncreaseDecreaseCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=cog_SavingsInvestmentPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=cog_DeferredCompensationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=cog_WestVirginiaVirginiaandOhioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |