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Fair Value Measurements And Derivative Instruments (Schedule Of Fair Value Of Derivatives Designated As Cash Flow Hedges) (Details) (Derivatives Designated As Cash Flow Hedges [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivatives, Fair Value [Line Items] |  |
Derivatives designated as cash flow hedges, Asset Derivatives, Fair Value | $ 722 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue | $ 1,606 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Derivatives designated as cash flow hedges, Liability Derivatives, Fair Value | 8,301 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue | 1,185 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Foreign Currency Derivatives [Member] | Other Receivables [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as cash flow hedges, Asset Derivatives, Fair Value | 722 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = gti_OtherReceivablesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 772 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = gti_OtherReceivablesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Foreign Currency Derivatives [Member] | Other Payables [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as cash flow hedges, Liability Derivatives, Fair Value | 1,234 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = gti_OtherPayablesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 1,185 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = gti_OtherPayablesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Commodity Derivative Contracts [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as cash flow hedges, Asset Derivatives, Fair Value | 0 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 834 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Commodity Derivative Contracts [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as cash flow hedges, Liability Derivatives, Fair Value | $ 7,067 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | $ 0 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember

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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=7476318&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=7476318&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_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration