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Rationalizations Rationalization Costs Incurred (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Restructuring Reserve	$ 18,421us-gaap_RestructuringReserve
Charges incurred	613us-gaap_RestructuringCharges	16,159us-gaap_RestructuringCharges
Change in estimates	(153)us-gaap_RestructuringReserveAccrualAdjustment	(3,997)us-gaap_RestructuringReserveAccrualAdjustment
Payments and settlements	(16,494)us-gaap_PaymentsForRestructuring	(1,506)us-gaap_PaymentsForRestructuring
Effect of change in currency exchange rates	(1,658)us-gaap_RestructuringReserveTranslationAdjustment	(229)us-gaap_RestructuringReserveTranslationAdjustment
Restructuring Reserve	1,035us-gaap_RestructuringReserve	0us-gaap_RestructuringReserve
2014 Engineered Solutions Rationalization [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			1,655us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Charges incurred		2,611us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Change in estimates		(40)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Payments and settlements		(916)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Effect of change in currency exchange rates		0us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Restructuring Reserve		0us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember	1,655us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
2014 Corporate and Research & Development Rationalization [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve	0us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Charges incurred	8,159us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Change in estimates	(21)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Payments and settlements	(1,155)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Effect of change in currency exchange rates	(152)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Restructuring Reserve	$ 6,873us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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