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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2015 | Dec. 31, 2011
Income Tax Examination [Line Items] |  |  |  |  |
U.S. federal income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |
Net non-current deferred tax assets | $ 16,819,000 us-gaap_DeferredTaxAssetsNetNoncurrent | $ 10,334,000 us-gaap_DeferredTaxAssetsNetNoncurrent |  |  |
Net non-current deferred tax liabilities | 28,197,000 us-gaap_DeferredTaxLiabilitiesNoncurrent | 41,684,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |  |
Total foreign tax credit carryforwards | 64,214,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 46,283,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 25,600,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |  |
Unrecognized tax benefits | 3,710,000 us-gaap_UnrecognizedTaxBenefits | 7,203,000 us-gaap_UnrecognizedTaxBenefits | 9,769,000 us-gaap_UnrecognizedTaxBenefits |  | 16,788,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would have a favorable impact on effective tax rate |  | 2,700,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
Accrued interest and penalties | 600,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 500,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 1,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |
Changes attributable to movement in underlying assets | 73,400,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 1,180,000 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 163,000 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount | 1,100,000,000 us-gaap_IncomeTaxReconciliationTaxSettlementsForeign |  |  |  |
Prepaid Expenses And Other Current Assets [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Net current deferred income tax assets | 28,400,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember | 37,100,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember |  |  |
Accrued Income And Other Taxes [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Net current deferred tax liabilities | 7,200,000 us-gaap_DeferredTaxLiabilitiesCurrent / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = gti_AccruedIncomeAndOtherTaxesMember | 10,900,000 us-gaap_DeferredTaxLiabilitiesCurrent / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = gti_AccruedIncomeAndOtherTaxesMember |  |  |
Foreign Country [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Total foreign tax credit carryforwards |  | 19,500,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Tax credit carryforwards, years | 7 years |  |  |  |
Operating loss carryforwards |  | 23,100,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 44,300,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |
Operating loss carryforwards | 36,300,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |
State [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Operating loss carryforwards | 191,500,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  |  | $ 2,000,000 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |

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