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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 | $ 76,063,000 us-gaap_GoodwillImpairmentLoss |  |
Rationalizations | 11,625,000 us-gaap_RestructuringAndRelatedCostIncurredCost | 20,156,000 us-gaap_RestructuringAndRelatedCostIncurredCost | 0 us-gaap_RestructuringAndRelatedCostIncurredCost
2013 Industrial Materials Rationalization [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Estimated Reduction in Capacity | 60,000 gti_EstimatedReductioninCapacity / us-gaap_RestructuringPlanAxis = gti_A2013IndustrialMaterialsRationalizationMember |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | 600 us-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 | 40 us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = gti_A2013EngineeredSolutionsRationalizationMember |  |
2013 Rationalization Initiatives [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | 31,231,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 65,701,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
Accelerated depreciation (recorded in Cost of sales) | 23,200,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 28,300,000 us-gaap_RestructuringReserveAcceleratedDepreciation / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
Other Restructuring Costs, Cost of Sales | 7,100,000 gti_OtherRestructuringCostsCostofSales / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember | 17,200,000 gti_OtherRestructuringCostsCostofSales / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |
2013 Rationalization Initiatives [Member] | Industrial Materials [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalizations | 29,714,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 60,257,000 us-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 | 1,517,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 3,628,000 us-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 |  | 400,000 us-gaap_GoodwillImpairmentLoss / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |
Other Restructuring Costs, Cost of Sales | 19,800,000 gti_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 | 25,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost / us-gaap_IncomeStatementLocationAxis = gti_ImpairmentsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
Impairments (recorded in Impairments) | 121,570,000 gti_RestructuringCostsAssetImpairment / us-gaap_IncomeStatementLocationAxis = gti_ImpairmentsMember / us-gaap_RestructuringPlanAxis = gti_A2014EngineeredSolutionsRationalizationMember |  |
Expected Payments for Restructuring | 19,800,000 gti_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 |  | 20,200,000 us-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 | $ 900,000 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpecialTerminationBenefitsMember / us-gaap_RestructuringPlanAxis = gti_A2013RationalizationInitiativesMember |  |

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