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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
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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 | $ 301 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
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) | 265 us-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 | 529 us-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) | $ 889 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 | $ (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

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
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