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INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Workers compensation and other claims related accruals $ 15,904,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther $ 11,825,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther  
Provision for doubtful accounts 8,921,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 7,370,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Closure, post-closure and remedial liabilities 43,640,000clh_DeferredTaxAssetsClosurePostClosureAndRemedialLiabilities 53,302,000clh_DeferredTaxAssetsClosurePostClosureAndRemedialLiabilities  
Accrued expenses 13,451,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 19,671,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Accrued compensation 12,094,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 5,681,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation  
Net operating loss carryforwards 46,740,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 77,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Tax credit carryforwards 29,347,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 29,985,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Uncertain tax positions accrued interest and federal benefit 1,953,000clh_DeferredTaxAssetsUncertainTaxPositionsAccruedInterestAndFederalBenefit 1,949,000clh_DeferredTaxAssetsUncertainTaxPositionsAccruedInterestAndFederalBenefit  
Stock-based compensation 489,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,159,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Other 3,622,000us-gaap_DeferredTaxAssetsOther 2,170,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 176,161,000us-gaap_DeferredTaxAssetsNet 210,812,000us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:      
Property, plant and equipment (232,106,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (225,271,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Permits and other intangible assets (155,326,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (159,223,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Total deferred tax liabilities (387,432,000)us-gaap_DeferredIncomeTaxLiabilities (384,494,000)us-gaap_DeferredIncomeTaxLiabilities  
Total net deferred tax liability before valuation allowance (211,271,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (173,682,000)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Less valuation allowance (29,061,000)us-gaap_DeferredTaxAssetsValuationAllowance (29,726,000)us-gaap_DeferredTaxAssetsValuationAllowance (26,300,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax liabilities (240,332,000)us-gaap_DeferredTaxLiabilitiesCurrent (203,408,000)us-gaap_DeferredTaxLiabilitiesCurrent  
State and local operating loss carryforwards 134,100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Domestic operating loss carryforwards 84,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
Foreign operating loss carryforwards 52,100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign    
Foreign tax credit carryforwards $ 29,300,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign