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Derivative Instruments (Schedule Of Fair Value Of Derivatives Designated As Cash Flow Hedges) (Details) (Designated as Hedging Instrument, Cash Flow Hedging, USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Derivative [Line Items] |  |
Asset Derivatives, Fair Value | $ 722 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue | $ 2,255 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Liability Derivatives, Fair Value | 8,301 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue | 1,109 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Foreign Currency Derivatives | Prepaid and other current assets |  |
Derivative [Line Items] |  |
Asset Derivatives, Fair Value | 2,211 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 722 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Foreign Currency Derivatives | Other current liabilities |  |
Derivative [Line Items] |  |
Liability Derivatives, Fair Value | 1,108 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 1,234 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Commodity Derivative Contracts | Prepaid and other current assets |  |
Derivative [Line Items] |  |
Asset Derivatives, Fair Value | 44 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Commodity Derivative Contracts | Other current liabilities |  |
Derivative [Line Items] |  |
Liability Derivatives, Fair Value | $ 1 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 7,067 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration