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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Commodity and foreign currency derivative tax $ (63)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax $ (300)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax $ 2,327us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Foreign currency translation adjustments 328,233us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 295,192us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Commodities and foreign currency derivatives, net of tax of $1,714 and ($25), respectively 8,291gti_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsOnSecuritiesNetOfTax (2,568)gti_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsOnSecuritiesNetOfTax  
Total accumulated comprehensive loss $ 336,524us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 292,624us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax