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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Cash Flows [Abstract]    
Cash and cash equivalents at beginning of year $ 103,003us-gaap_CashAndCashEquivalentsAtCarryingValue $ 238,703us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash flows from operating activities:    
Net income 63,947us-gaap_NetIncomeLoss 57,523us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash flows from operating activities:    
Depreciation and amortization 10,186us-gaap_DepreciationDepletionAndAmortization 10,258us-gaap_DepreciationDepletionAndAmortization
Noncash pension and postretirement expense 5,837neu_DefinedBenefitPensionandPostretirementExpense 3,654neu_DefinedBenefitPensionandPostretirementExpense
Deferred income tax expense 818neu_DeferredIncomeTaxExpenseBenefitTotal 1,996neu_DeferredIncomeTaxExpenseBenefitTotal
Unrealized gain on derivative instruments, net (95)us-gaap_UnrealizedGainLossOnDerivatives (310)us-gaap_UnrealizedGainLossOnDerivatives
Working capital changes (13,806)us-gaap_IncreaseDecreaseInOperatingCapital (66,764)us-gaap_IncreaseDecreaseInOperatingCapital
Cash pension and postretirement contributions (6,730)us-gaap_PensionAndOtherPostretirementBenefitContributions (5,202)us-gaap_PensionAndOtherPostretirementBenefitContributions
Other, net (3,605)us-gaap_OtherOperatingActivitiesCashFlowStatement 3,226us-gaap_OtherOperatingActivitiesCashFlowStatement
Cash provided from (used in) operating activities 56,552us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 4,381us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Capital expenditures (20,424)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (9,251)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Deposits for interest rate swap (7,118)neu_IncreaseInMarginDepositsOutstanding (1,325)neu_IncreaseInMarginDepositsOutstanding
Return of deposits for interest rate swap 6,750neu_DecreaseInMarginDepositsOutstanding 1,580neu_DecreaseInMarginDepositsOutstanding
Other, net (2,503)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (2,543)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Cash provided from (used in) investing activities (23,295)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (11,539)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Net borrowings under revolving credit facility 10,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit 6,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Dividends paid (17,421)us-gaap_PaymentsOfDividendsCommonStock (14,200)us-gaap_PaymentsOfDividendsCommonStock
Repurchases of common stock (1,042)us-gaap_PaymentsForRepurchaseOfCommonStock (77,061)us-gaap_PaymentsForRepurchaseOfCommonStock
Other, net (3,022)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (161)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Cash provided from (used in) financing activities (11,485)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (85,422)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of foreign exchange on cash and cash equivalents (5,532)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 534us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase (decrease) in cash and cash equivalents 16,240us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (92,046)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at end of period 119,243us-gaap_CashAndCashEquivalentsAtCarryingValue 146,657us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of non-cash transactions:    
Additions to property, plant, and equipment included in current liabilities $ 5,433us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 0us-gaap_CapitalExpendituresIncurredButNotYetPaid