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Derivative Instruments (Schedule Of Realized (Gains) Losses On Derivatives Recognized In Statement Of Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Designated as Hedging Instrument | Cash Flow Hedging | Foreign Currency Derivatives | Cost of goods sold/Other expense / (income) / Revenue    
Derivative [Line Items]    
Amount of (Gain)/Loss Recognized (Effective Portion) $ (712)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_ForeignCurrencyDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= gti_CostOfGoodSoldOtherExpenseIncomeRevenueMember
$ 301us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_ForeignCurrencyDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= gti_CostOfGoodSoldOtherExpenseIncomeRevenueMember
Amount of (Gain)/Loss Recognized - Tax (223)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_ForeignCurrencyDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= gti_CostOfGoodSoldOtherExpenseIncomeRevenueMember
(3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_ForeignCurrencyDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= gti_CostOfGoodSoldOtherExpenseIncomeRevenueMember
Designated as Hedging Instrument | Cash Flow Hedging | Commodity Forward Derivatives | Cost of goods sold / Revenue    
Derivative [Line Items]    
Amount of (Gain)/Loss Recognized (Effective Portion) 265us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_CommodityForwardDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
529us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_CommodityForwardDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Amount of (Gain)/Loss Recognized - Tax (16)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_CommodityForwardDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
(193)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_CommodityForwardDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Not Designated As Hedging Instrument | Fair Value Hedging | Foreign Currency Derivatives | Cost of goods sold/Other expense (income)    
Derivative [Line Items]    
Amount of (Gain)/Loss Recognized (Effective Portion) $ 889us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_ForeignCurrencyDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= gti_CostOfGoodSoldOtherExpenseIncomeMember
$ (191)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= gti_ForeignCurrencyDerivativesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= gti_CostOfGoodSoldOtherExpenseIncomeMember