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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
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, Asset Derivatives, Fair Value	$ 722us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue	$ 1,606us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Derivatives designated as cash flow hedges, Liability Derivatives, Fair Value	8,301us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue	1,185us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Foreign Currency Derivatives [Member] | Other Receivables [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, Asset Derivatives, Fair Value	722us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = gti_OtherReceivablesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	772us-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	1,234us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = gti_OtherPayablesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	1,185us-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	0us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	834us-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	$ 7,067us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	$ 0us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember

X

- 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

X

- 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

X

- Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration