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Retirement Plans And Postretirement Benefits (Projected Future Pension Plan Cash Flow By Year) (Details) (Retirement Plans [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
U.S. [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions $ 9,084us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Expected employee contributions 0gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2012 8,941us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2013 9,039us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2014 9,166us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2015 9,278us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2016 9,340us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2017-2021 47,554us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Foreign [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions 974us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Expected employee contributions 0gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2012 3,826us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2013 3,835us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2014 3,918us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2015 4,145us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2016 3,904us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2017-2021 $ 22,523us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember