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Rationalizations and Impairments (Rationalization-Roll-forward) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
2013 Rationalization Initiatives
Restructuring Reserve [Roll Forward]
Beginning balance	$ 1,035us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	$ 18,421us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Charges incurred	0us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	613us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Change in estimates	(112)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	(153)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Payments and settlements	(549)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	(16,494)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Effect of change in currency exchange rates	(108)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	(1,658)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Ending balance	490us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	1,035us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
2014 Engineered Solutions Rationalization
Restructuring Reserve [Roll Forward]
Beginning balance	1,655us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember	0us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Charges incurred	50us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember	2,611us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Change in estimates	(16)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember	(40)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Payments and settlements	(434)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember	(916)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Ending balance	1,255us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember	1,655us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
2014 Corporate and Research & Development Rationalization
Restructuring Reserve [Roll Forward]
Beginning balance	6,873us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember	0us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Charges incurred	(2)us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember	8,159us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Change in estimates	34us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember	(21)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Payments and settlements	(2,231)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember	(1,155)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Effect of change in currency exchange rates	(48)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember	(152)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
Ending balance	4,558us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember	6,873us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2014CorporateandResearchDevelopmentRationalizationMember
2015 Advanced Graphite Materials Rationalization
Restructuring Reserve [Roll Forward]
Beginning balance	0us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember
Charges incurred	2,382us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember
Payments and settlements	(17)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember
Ending balance	$ 2,329us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = gti_A2015AdvancedGraphiteMaterialsRationalizationMember

X

- 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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X

- Definition

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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- Definition

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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Amount of (expense) reversal of expense related to a previously accrued restructuring cost liability. Excludes adjustments for costs incurred, costs settled, and foreign currency translation adjustments.

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Amount of gain (loss) from translating a restructuring reserve to the currency of the reporting entity from an amount denominated or measured in a different currency.

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