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