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Segment Reporting (Schedule Of Financial Information Concerning Reportable Segments) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | $ 1,085,304,000 us-gaap_SalesRevenueNet | $ 1,166,674,000 us-gaap_SalesRevenueNet | $ 1,248,264,000 us-gaap_SalesRevenueNet
Total segment operating income (loss) |  | (255,620,000)us-gaap_OperatingIncomeLoss | (2,570,000)us-gaap_OperatingIncomeLoss | 156,468,000 us-gaap_OperatingIncomeLoss
Equity in earnings of and gain recorded on acquisition of non-consolidated affiliate |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Other (income) expense, net |  | 2,445,000 us-gaap_OtherNonoperatingIncomeExpense | 1,698,000 us-gaap_OtherNonoperatingIncomeExpense | (1,005,000)us-gaap_OtherNonoperatingIncomeExpense
Interest expense |  | 37,057,000 us-gaap_InterestExpense | 36,037,000 us-gaap_InterestExpense | 23,247,000 us-gaap_InterestExpense
Interest income |  | (330,000)us-gaap_InvestmentIncomeInterest | (203,000)us-gaap_InvestmentIncomeInterest | (261,000)us-gaap_InvestmentIncomeInterest
Income before income taxes |  | (294,792,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (40,102,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 134,487,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Impairment of long-lived assets and goodwill | 75,700,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 197,220,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Loss Related to Bankruptcy of Major Customer |  | 4,800,000 gti_LossRelatedtoBankruptcyofMajorCustomer |  |
Industrial Materials [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 840,103,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 909,448,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 1,025,571,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember
Total segment operating income (loss) |  | (50,260,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 20,007,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 197,335,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember
Other (income) expense, net |  |  | 60,300,000 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 34,500,000 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember
Mark To Market Adjustment |  | 3,500,000 gti_MarkToMarketAdjustment / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember | 4,200,000 gti_MarkToMarketAdjustment / us-gaap_StatementBusinessSegmentsAxis = gti_IndustrialMaterialsMember |
Engineered Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 245,201,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 257,226,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 222,693,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember
Total segment operating income (loss) |  | (138,271,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 28,392,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 22,374,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember
Other (income) expense, net |  |  | 3,600,000 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 22,000,000 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember
Mark To Market Adjustment |  | 9,200,000 gti_MarkToMarketAdjustment / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember | 5,900,000 gti_MarkToMarketAdjustment / us-gaap_StatementBusinessSegmentsAxis = gti_EngineeredSolutionsMember |
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment operating income (loss) |  | (67,089,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (50,969,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | (63,241,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Other (income) expense, net |  |  | 1,800,000 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 6,300,000 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Mark To Market Adjustment |  | (6,300,000)gti_MarkToMarketAdjustment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 4,200,000 gti_MarkToMarketAdjustment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Proxy Context Costs |  | $ 2,400,000 gti_ProxyContextCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |

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