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Retirement Plans And Postretirement Benefits (Projected Future Postretirement Cash Flow By Year) (Details) (Postretirement Benefit Costs [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 $ 1,204us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Expected employee contributions 0gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2012 1,204us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2013 1,172us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2014 1,124us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2015 1,062us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2016 985us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2017-2021 3,668us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Foreign [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions 953us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Expected employee contributions 0gti_DefinedBenefitPlanEstimatedFutureEmployeeContributionsInCurrentFiscalYear
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2012 953us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2013 985us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2014 990us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2015 999us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2016 1,007us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
2017-2021 $ 5,258us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember