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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net (loss) income $ (28,328)us-gaap_ProfitLoss $ 95,566us-gaap_ProfitLoss $ 129,674us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 276,083us-gaap_DepreciationDepletionAndAmortization 264,449us-gaap_DepreciationDepletionAndAmortization 161,646us-gaap_DepreciationDepletionAndAmortization
Goodwill impairment charge 123,414us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Pre-tax, non-cash acquisition accounting inventory adjustments 0clh_NoncashAcquisitionAccountingAdjustmentsBeforeTax 13,559clh_NoncashAcquisitionAccountingAdjustmentsBeforeTax 0clh_NoncashAcquisitionAccountingAdjustmentsBeforeTax
Allowance for doubtful accounts 8,917us-gaap_ProvisionForDoubtfulAccounts 7,933us-gaap_ProvisionForDoubtfulAccounts 1,213us-gaap_ProvisionForDoubtfulAccounts
Amortization of deferred financing costs and debt discount 3,289us-gaap_AmortizationOfFinancingCostsAndDiscounts 3,301us-gaap_AmortizationOfFinancingCostsAndDiscounts 1,793us-gaap_AmortizationOfFinancingCostsAndDiscounts
Accretion of environmental liabilities 10,612clh_AccretionOfEnvironmentalLiabilities 11,541clh_AccretionOfEnvironmentalLiabilities 9,917clh_AccretionOfEnvironmentalLiabilities
Changes in environmental liability estimates (3,367)us-gaap_OtherIncreaseDecreaseInEnvironmentalLiabilities (3,682)us-gaap_OtherIncreaseDecreaseInEnvironmentalLiabilities (8,458)us-gaap_OtherIncreaseDecreaseInEnvironmentalLiabilities
Deferred income taxes 32,320us-gaap_DeferredIncomeTaxExpenseBenefit 31,119us-gaap_DeferredIncomeTaxExpenseBenefit 34,163us-gaap_DeferredIncomeTaxExpenseBenefit
Other (income) expense (4,380)clh_GainLossOnSaleOfFixedAssetsAndAssetsHeldForSale (1,705)clh_GainLossOnSaleOfFixedAssetsAndAssetsHeldForSale 802clh_GainLossOnSaleOfFixedAssetsAndAssetsHeldForSale
Stock-based compensation 8,800us-gaap_ShareBasedCompensation 8,946us-gaap_ShareBasedCompensation 7,494us-gaap_ShareBasedCompensation
Excess tax benefit of stock-based compensation (878)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (1,409)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (2,556)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net tax benefit on stock-based awards 816us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 1,399us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 2,546us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Write-off of deferred financing costs and debt (premium) discount 0clh_WriteOffDeferredFinancingCostsAndDebtDiscount 0clh_WriteOffDeferredFinancingCostsAndDebtDiscount 5,341clh_WriteOffDeferredFinancingCostsAndDebtDiscount
Environmental expenditures (20,245)us-gaap_PaymentsForEnvironmentalLiabilities (19,416)us-gaap_PaymentsForEnvironmentalLiabilities (11,191)us-gaap_PaymentsForEnvironmentalLiabilities
Changes in assets and liabilities:      
Accounts receivable and unbilled accounts receivables (14,342)us-gaap_IncreaseDecreaseInAccountsReceivable (54,213)us-gaap_IncreaseDecreaseInAccountsReceivable 60,550us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories and supplies (21,339)us-gaap_IncreaseDecreaseInInventories (1,144)us-gaap_IncreaseDecreaseInInventories (12,871)us-gaap_IncreaseDecreaseInInventories
Other current assets (19,030)us-gaap_IncreaseDecreaseInOtherOperatingAssets 20,857us-gaap_IncreaseDecreaseInOtherOperatingAssets 3,157us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (52,026)us-gaap_IncreaseDecreaseInAccountsPayable 37,117us-gaap_IncreaseDecreaseInAccountsPayable 5,930us-gaap_IncreaseDecreaseInAccountsPayable
Other current and long-term liabilities (2,950)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 1,621us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (64,785)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash from operating activities 297,366us-gaap_NetCashProvidedByUsedInOperatingActivities 415,839us-gaap_NetCashProvidedByUsedInOperatingActivities 324,365us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Additions to property, plant and equipment (257,613)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (280,207)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (197,397)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sales of fixed assets 8,164clh_ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale 4,699clh_ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale 8,125clh_ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale
Acquisitions, net of cash acquired (16,187)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (63,264)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (1,373,921)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Additions to intangible assets including costs to obtain or renew permits (6,519)us-gaap_PaymentsToAcquireIntangibleAssets (6,740)us-gaap_PaymentsToAcquireIntangibleAssets (4,046)us-gaap_PaymentsToAcquireIntangibleAssets
Purchase of marketable securities 0us-gaap_PaymentsToAcquireAvailableForSaleSecurities 0us-gaap_PaymentsToAcquireAvailableForSaleSecurities (10,517)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sales of investments 13,861us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Other 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 5,120us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (258,294)us-gaap_NetCashProvidedByUsedInInvestingActivities (345,512)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,572,636)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Change in uncashed checks 15,069us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities 12,268us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities (12,070)us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities
Proceeds from exercise of stock options 0us-gaap_ProceedsFromStockOptionsExercised 400us-gaap_ProceedsFromStockOptionsExercised 288us-gaap_ProceedsFromStockOptionsExercised
Remittance of shares, net (2,793)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (731)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (2,912)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Repurchases of common stock (104,341)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Excess tax benefit of stock-based compensation 878us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1,409us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 2,556us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Deferred financing costs paid 0us-gaap_PaymentsOfFinancingCosts (2,504)us-gaap_PaymentsOfFinancingCosts (19,056)us-gaap_PaymentsOfFinancingCosts
Repayment of long-term obligations (5,000)us-gaap_RepaymentsOfLongTermDebt 0us-gaap_RepaymentsOfLongTermDebt (520,000)us-gaap_RepaymentsOfLongTermDebt
Proceeds from employee stock purchase plan 4,364us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans 7,425us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans 6,196us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
Payments on capital leases (2,122)clh_RepaymentOfCapitalLeaseObligation (4,891)clh_RepaymentOfCapitalLeaseObligation (6,599)clh_RepaymentOfCapitalLeaseObligation
Proceeds from issuance of common stock, net 0us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock 369,520us-gaap_ProceedsFromIssuanceOfCommonStock
Distribution of cash earned on employee participation plan 0clh_DistributionsEarnedOnEmployeeParticipationPlan 0clh_DistributionsEarnedOnEmployeeParticipationPlan (55)clh_DistributionsEarnedOnEmployeeParticipationPlan
Issuance of senior unsecured notes, at par 0clh_IssuanceOfSeniorUnsecuredNotesAtPar 0clh_IssuanceOfSeniorUnsecuredNotesAtPar 1,400,000clh_IssuanceOfSeniorUnsecuredNotesAtPar
Issuance costs related to issuances of common stock 0us-gaap_PaymentsOfStockIssuanceCosts (250)us-gaap_PaymentsOfStockIssuanceCosts 0us-gaap_PaymentsOfStockIssuanceCosts
Net cash (used in) from financing activities (93,945)us-gaap_NetCashProvidedByUsedInFinancingActivities 13,126us-gaap_NetCashProvidedByUsedInFinancingActivities 1,217,868us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate change on cash (8,321)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (3,216)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (484)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
(Decrease) increase in cash and cash equivalents (63,194)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 80,237us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (30,887)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 310,073us-gaap_CashAndCashEquivalentsAtCarryingValue 229,836us-gaap_CashAndCashEquivalentsAtCarryingValue 260,723us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 246,879us-gaap_CashAndCashEquivalentsAtCarryingValue 310,073us-gaap_CashAndCashEquivalentsAtCarryingValue 229,836us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash payments for interest and income taxes:      
Interest paid 75,408us-gaap_InterestPaidNet 75,627us-gaap_InterestPaidNet 41,817us-gaap_InterestPaidNet
Income taxes paid (received) 42,022us-gaap_IncomeTaxesPaidNet (8,162)us-gaap_IncomeTaxesPaidNet 13,179us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:      
Property, plant and equipment accrued 23,563us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 33,214us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1 29,788us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1
Transfer of inventory to property, plant and equipment 1,324clh_TransferofInventorytoPropertyPlantandEquipment 11,369clh_TransferofInventorytoPropertyPlantandEquipment 0clh_TransferofInventorytoPropertyPlantandEquipment
Accrued business combination adjustments 355clh_AccruedWorkingCapitalAdjustmentIncreaseDecrease 0clh_AccruedWorkingCapitalAdjustmentIncreaseDecrease (750)clh_AccruedWorkingCapitalAdjustmentIncreaseDecrease
Assets acquired through capital lease $ 0us-gaap_CapitalLeaseObligationsIncurred $ 0us-gaap_CapitalLeaseObligationsIncurred $ 154us-gaap_CapitalLeaseObligationsIncurred