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Fair Value Measurements And Derivative Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Fair value of long-term debt		$ 473,300,000us-gaap_LongTermDebtFairValue
Loan balance, net of unamortized discount		541,593,000us-gaap_LongTermDebt
Unrealized gain on foreign currency derivatives		100,000us-gaap_UnrealizedGainOnForeignCurrencyDerivativesBeforeTax
Unrealized loss on foreign currency derivatives	900,000us-gaap_UnrealizedLossOnForeignCurrencyDerivativesBeforeTax
Commodity derivative contracts, unrealized gain	7,100,000us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts	800,000us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Hedging Instruments, Non-derivative, Assets	15,800,000gti_HedgingInstrumentsNonderivativeAssets	25,200,000gti_HedgingInstrumentsNonderivativeAssets
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	200,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	4,700,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Foreign Currency Derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional amounts of foreign currency derivatives	138,600,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember	95,200,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gti_ForeignCurrencyDerivativesMember
Commodity Derivative Contracts [Member] | Refined Oil Products [Member]
Derivatives, Fair Value [Line Items]
Outstanding derivative swap contracts	17,800,000us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = gti_CommodityDerivativeContractsMember / us-gaap_TradingActivityByTypeAxis = gti_RefinedOilProductsMember
Minimum [Member] | Foreign Currency Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative maturities	January 2015
Minimum [Member] | Commodity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative maturities	January 2015
Maximum [Member] | Foreign Currency Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative maturities	October 2015
Maximum [Member] | Commodity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative maturities	March 2015
Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of long-term debt	$ 549,800,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition

Derivative maturities

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Hedging Instruments, Non-derivative, Assets

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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Nominal or face amount used to calculate payments on the derivative liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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-Article 7



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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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Amount of unrealized gain related to the increase in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

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Amount of unrealized loss recorded in accumulated other comprehensive income pertaining to the decrease in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments to the extent that a cash flow hedge is determined to be effective.

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