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Income Taxes (Summary of the Total Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Tax carryforwards $ 8,531us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 5,029us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Inventories 7,027us-gaap_DeferredTaxAssetsInventory 4,709us-gaap_DeferredTaxAssetsInventory
Accrued expenses and reserves 28,842us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 26,019us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Other employee benefits 13,264us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 11,432us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Asset impairment 39,757us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses [1] 841us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses [1]
Other 9,199us-gaap_DeferredTaxAssetsOther 6,534us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 106,620us-gaap_DeferredTaxAssetsGross 54,564us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance 8,521us-gaap_DeferredTaxAssetsValuationAllowance 2,280us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance 98,099us-gaap_DeferredTaxAssetsNet 52,284us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities    
Depreciation and depletion 43,111nacco_DeferredTaxLiabilitiesDepreciationAndDepletion 39,906nacco_DeferredTaxLiabilitiesDepreciationAndDepletion
Partnership investment - development costs 19,535us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts 20,215us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts
Accrued pension benefits 858nacco_DeferredTaxLiabilitiesAccruedPensionBenefits 1,037nacco_DeferredTaxLiabilitiesAccruedPensionBenefits
Unremitted foreign earnings 223us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 168us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Total deferred tax liabilities 63,727us-gaap_DeferredIncomeTaxLiabilities 61,326us-gaap_DeferredIncomeTaxLiabilities
Net deferred asset (liability) $ 34,372us-gaap_DeferredTaxAssetsLiabilitiesNet $ (9,042)us-gaap_DeferredTaxAssetsLiabilitiesNet
[1] )During the fourth quarter of 2014, NACoal's long-lived asset evaluation resulted in the Company recording a non-cash asset impairment charge of $105.1 million for the Reed Minerals' long-lived asset group. See Note 5, Note 6 and Note 10 for further discussion of the Company's long-lived asset impairment.