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Rationalizations Rationalization Text (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Goodwill, Impairment Loss	$ 76,063,000us-gaap_GoodwillImpairmentLoss
Rationalizations	11,625,000us-gaap_RestructuringAndRelatedCostIncurredCost	20,156,000us-gaap_RestructuringAndRelatedCostIncurredCost	0us-gaap_RestructuringAndRelatedCostIncurredCost
2013 Industrial Materials Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Estimated Reduction in Capacity	60,000gti_EstimatedReductioninCapacity / us-gaap_RestructuringPlanAxis = gti_A2013IndustrialMaterialsRationalizationMember
Restructuring and Related Cost, Expected Number of Positions Eliminated	600us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = gti_A2013IndustrialMaterialsRationalizationMember
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent		20.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent / us-gaap_RestructuringPlanAxis = gti_A2013IndustrialMaterialsRationalizationMember
2013 Engineered Solutions Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	40us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = gti_A2013EngineeredSolutionsRationalizationMember
2013 Rationalization Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Rationalizations	31,231,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	65,701,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Accelerated depreciation (recorded in Cost of sales)	23,200,000us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	28,300,000us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Other Restructuring Costs, Cost of Sales	7,100,000gti_OtherRestructuringCostsCostofSales / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember	17,200,000gti_OtherRestructuringCostsCostofSales / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
2013 Rationalization Initiatives [Member] | Industrial Materials [Member]
Restructuring Cost and Reserve [Line Items]
Rationalizations	29,714,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember	60,257,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember
2013 Rationalization Initiatives [Member] | Engineered Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Rationalizations	1,517,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember	3,628,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember
2014 Engineered Solutions Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Goodwill, Impairment Loss		400,000us-gaap_GoodwillImpairmentLoss / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Other Restructuring Costs, Cost of Sales	19,800,000gti_OtherRestructuringCostsCostofSales / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Impairments [Member] | 2014 Engineered Solutions Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	25,000,000us-gaap_RestructuringAndRelatedCostExpectedCost / us-gaap_IncomeStatementLocationAxis = gti_ImpairmentsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Impairments (recorded in Impairments)	121,570,000gti_RestructuringCostsAssetImpairment / us-gaap_IncomeStatementLocationAxis = gti_ImpairmentsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Expected Payments for Restructuring	19,800,000gti_ExpectedPaymentsforRestructuring / us-gaap_IncomeStatementLocationAxis = gti_ImpairmentsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember
Employee Severance [Member] | 2013 Rationalization Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Rationalizations		20,200,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember
Special Termination Benefits [Member] | 2013 Rationalization Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Rationalizations	$ 900,000us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember

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Estimated Reduction in Capacity

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Expected Payments for Restructuring

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Restructuring Costs, Asset Impairment

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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Amount expected to be recognized in earnings for the specified restructuring cost.

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