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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Net operating loss carryforward $ 18,200us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 11,324us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Credit carryforward 694us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 708us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Accruals 62,845us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 32,352us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Allowance for doubtful accounts 1,998us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 2,068us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventories 11,437us-gaap_DeferredTaxAssetsInventory 15,440us-gaap_DeferredTaxAssetsInventory
Other 7,660us-gaap_DeferredTaxAssetsOther 6,666us-gaap_DeferredTaxAssetsOther
Deferred taxes assets, total 102,834us-gaap_DeferredTaxAssetsGross 68,558us-gaap_DeferredTaxAssetsGross
Property, plant and equipment (398,683)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (434,561)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Turnaround costs (2,289)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts (26,002)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts
Basis difference—consolidated partnerships (194,480)wlk_DeferredTaxLiabilitiesParentsBasisInConsolidatedPartnerships 0wlk_DeferredTaxLiabilitiesParentsBasisInConsolidatedPartnerships
Other 0us-gaap_DeferredTaxLiabilitiesOther (478)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities-total (595,452)us-gaap_DeferredTaxLiabilities (461,041)us-gaap_DeferredTaxLiabilities
Valuation allowance (11,011)us-gaap_DeferredTaxAssetsValuationAllowance (11,324)us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred tax liabilities (503,629)us-gaap_DeferredTaxAssetsLiabilitiesNet (403,807)us-gaap_DeferredTaxAssetsLiabilitiesNet
Balance sheet classifications    
Current deferred tax asset 32,437us-gaap_DeferredTaxAssetsNetCurrent 34,169us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax liability (536,066)us-gaap_DeferredTaxLiabilitiesNoncurrent (437,976)us-gaap_DeferredTaxLiabilitiesNoncurrent
Total net deferred tax liabilities $ (503,629)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (403,807)us-gaap_DeferredTaxAssetsLiabilitiesNet