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Fair Value Measurements And Derivative Instruments (Schedule Of Realized (Gains) Losses On Derivatives Recognized In Statement Of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Not Designated as Hedging Instrument [Member] | Derivatives Designated As Fair Value Hedges [Member] | Foreign Currency Derivatives [Member] | Cost Of Good Sold Other Expense Income [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amount of (Gain)/Loss Recognized | $ 1,020 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 | $ (1,123)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
Designated as Hedging Instrument [Member] | Derivatives Designated As Cash Flow Hedges [Member] | Foreign Currency Derivatives [Member] | Cost Of Good Sold Other Expense Income Revenue [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amount of (Gain)/Loss Recognized | (849)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 | 1,445 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
Designated as Hedging Instrument [Member] | Derivatives Designated As Cash Flow Hedges [Member] | Commodity Forward Derivatives [Member] | Cost of Sales [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amount of (Gain)/Loss Recognized | $ 328 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 | $ 70 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

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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=7476318&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=7476318&loc=SL5624171-113959 + Details
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- Details
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