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Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred income tax assets:        
Pension $ 12,317us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions $ 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions    
Non-pension postretirement benefits 24,326us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 22,749us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits    
Other accrued liabilities 18,726us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 18,084us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther    
Receivables 1,798us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 1,467us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts    
Net operating loss and charitable contribution carry forwards 33,531lby_DeferredTaxAssetsOperatingLossAndCharitableContributionCarryforwards 32,806lby_DeferredTaxAssetsOperatingLossAndCharitableContributionCarryforwards    
Tax credits 10,320us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 10,953us-gaap_DeferredTaxAssetsTaxCreditCarryforwards    
Total deferred income tax assets 101,018us-gaap_DeferredTaxAssetsGross 86,059us-gaap_DeferredTaxAssetsGross    
Deferred income tax liabilities:        
Property, plant and equipment 20,986us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 22,053us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Inventories 5,037us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts 4,762us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts    
Pension 0lby_DeferredTaxLiabilitiesPension 3,031lby_DeferredTaxLiabilitiesPension    
Intangibles and other assets 7,581lby_DeferredTaxLiabilitiesIntangiblesAndOtherAssets 10,238lby_DeferredTaxLiabilitiesIntangiblesAndOtherAssets    
Total deferred income tax liabilities 33,604us-gaap_DeferredIncomeTaxLiabilities 40,084us-gaap_DeferredIncomeTaxLiabilities    
Net deferred income tax asset (liability):        
Net deferred income tax asset before valuation allowance 67,414lby_DeferredTaxAssetsLiabilitiesGross 45,975lby_DeferredTaxAssetsLiabilitiesGross    
Valuation allowance (66,486)us-gaap_DeferredTaxAssetsValuationAllowance (46,048)us-gaap_DeferredTaxAssetsValuationAllowance (77,629)us-gaap_DeferredTaxAssetsValuationAllowance (76,452)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax asset (liability) $ 928us-gaap_DeferredTaxAssetsLiabilitiesNet $ (73)us-gaap_DeferredTaxAssetsLiabilitiesNet