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v2.4.1.9

Income Taxes (Schedule Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Postretirement and other employee benefits | $ 43,204 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | $ 41,604 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Foreign tax credit and other carryforwards | 64,214 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 46,283 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Capitalized research and experimental costs | 23,446 gti_DeferredTaxAssetsDeferredExpenseCapitalizedResearchAndDevelopmentCosts | 20,243 gti_DeferredTaxAssetsDeferredExpenseCapitalizedResearchAndDevelopmentCosts
Environmental reserves | 3,366 gti_DeferredTaxAssetsEnvironmentalReserves | 3,503 gti_DeferredTaxAssetsEnvironmentalReserves
Inventory adjustments | 19,568 us-gaap_DeferredTaxAssetsInventory | 16,255 us-gaap_DeferredTaxAssetsInventory
Capital loss | 272 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 2,697 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Deferred Tax Assets, Goodwill and Intangible Assets | 0 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 0 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Deferred Tax Assets, Property, Plant and Equipment | 0 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 0 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Asset, Option Amortization | 2,214 gti_DeferredTaxAssetOptionAmortization | 0 gti_DeferredTaxAssetOptionAmortization
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges | 17,255 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges | 17,410 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges
Other | 6,288 us-gaap_DeferredTaxAssetsOther | 5,889 us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets | 179,827 us-gaap_DeferredTaxAssetsGross | 153,884 us-gaap_DeferredTaxAssetsGross
Less: valuation allowance | (95,721)us-gaap_DeferredTaxAssetsValuationAllowance | (20,411)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets | 84,106 us-gaap_DeferredTaxAssetsNet | 133,473 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |
Fixed assets | 59,292 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 109,824 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Debt discount amortization | 3,301 us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts | 6,620 us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts
Inventory | 6,865 gti_DeferredTaxLiabilitiesInventory | 9,212 gti_DeferredTaxLiabilitiesInventory
Goodwill and acquired intangibles | 1,046 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | 10,813 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Other | 3,761 us-gaap_DeferredTaxLiabilitiesOther | 2,204 us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | 74,265 us-gaap_DeferredTaxLiabilities | 138,673 us-gaap_DeferredTaxLiabilities
Net deferred tax liability | $ 9,841 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (5,200)us-gaap_DeferredTaxAssetsLiabilitiesNet

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