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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Activities    
Net income $ 8,399us-gaap_NetIncomeLoss $ 9,822us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 2,804us-gaap_Depreciation 2,808us-gaap_Depreciation
Amortization of bond premiums 61us-gaap_AdjustmentForAmortization 216us-gaap_AdjustmentForAmortization
Provision for losses on accounts receivable, net of adjustments (59)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease (130)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Provision for excess and obsolete inventories, net 41us-gaap_InventoryWriteDown 4us-gaap_InventoryWriteDown
Share-based compensation 438us-gaap_ShareBasedCompensation 412us-gaap_ShareBasedCompensation
Excess tax benefits from stock options exercised and restricted stock awards vested (1,098)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (356)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Loss (gain) on disposal of assets 5us-gaap_GainLossOnDispositionOfAssets (24)us-gaap_GainLossOnDispositionOfAssets
Foreign currency transaction loss 70us-gaap_ForeignCurrencyTransactionGainLossRealized 31us-gaap_ForeignCurrencyTransactionGainLossRealized
Interest income on note receivable (8)aaon_InterestIncomeNoteReceivable (10)aaon_InterestIncomeNoteReceivable
Deferred income taxes (443)us-gaap_DeferredIncomeTaxExpenseBenefit (1,154)us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities:    
Accounts receivable 4,286us-gaap_IncreaseDecreaseInAccountsReceivable (6,511)us-gaap_IncreaseDecreaseInAccountsReceivable
Income tax receivable 1,286us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 1,429us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Inventories (6,969)us-gaap_IncreaseDecreaseInInventories (2,755)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other (301)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (397)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (1,316)us-gaap_IncreaseDecreaseInAccountsPayable 3,441us-gaap_IncreaseDecreaseInAccountsPayable
Deferred revenue 64us-gaap_IncreaseDecreaseInDeferredRevenue 204us-gaap_IncreaseDecreaseInDeferredRevenue
Accrued liabilities (2,925)us-gaap_IncreaseDecreaseInAccruedLiabilities 2,039us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities 4,335us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 9,069us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing Activities    
Capital expenditures (3,587)us-gaap_PaymentsToAcquireProductiveAssets (3,616)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from sale of property, plant and equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 27us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Maturities of certificates of deposits 2,638us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments 1,403us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments
Maturities of investments 8,445us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 2,717us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Proceeds from called investments 504us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities 253us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Principal payments from note receivable 14us-gaap_ProceedsFromCollectionOfNotesReceivable 17us-gaap_ProceedsFromCollectionOfNotesReceivable
Net cash provided by investing activities 8,014us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 801us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing Activities    
Stock options exercised 1,082us-gaap_ProceedsFromStockOptionsExercised 340us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefits from stock options exercised and restricted stock awards vested 1,098us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 356us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Repurchase of stock (2,955)us-gaap_PaymentsForRepurchaseOfEquity (2,981)us-gaap_PaymentsForRepurchaseOfEquity
Net cash used in financing activities (775)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (2,285)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 11,574us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 7,585us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 21,952us-gaap_CashAndCashEquivalentsAtCarryingValue 12,085us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 33,526us-gaap_CashAndCashEquivalentsAtCarryingValue $ 19,670us-gaap_CashAndCashEquivalentsAtCarryingValue