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Stock-Based Compensation (Schedule Of Restricted Stock And Performance Share Awards Activity) (Details) (Restricted Stock And Performance Shares [Member], USD $)
3 Months Ended
Mar. 31, 2015
Restricted Stock And Performance Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding unvested as of January 1, 2015 1,814,130us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Number of Shares, Granted 3,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Number of Shares, Vested (44,922)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Number of Shares, Forfeited/canceled/expired (41,836)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Outstanding unvested as of March 31, 2015 1,730,372us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Outstanding unvested as of January 1, 2015 $ 6.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Weighted-Average Grant Date Fair Value, Granted $ 4.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Weighted-Average Grant Date Fair Value, Vested $ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Weighted-Average Grant Date Fair Value, Forfeited/canceled/expired $ 6.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember
Outstanding unvested as of March 31, 2015 $ 6.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= gti_RestrictedStockAndPerformanceSharesMember