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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 income $ 4,066us-gaap_ProfitLoss $ 33,932us-gaap_ProfitLoss $ 36,826us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash (used in) provided by operating activities:      
Depreciation and amortization of fixed and intangible assets 16,332us-gaap_DepreciationDepletionAndAmortization 14,845us-gaap_DepreciationDepletionAndAmortization 13,487us-gaap_DepreciationDepletionAndAmortization
Amortization of other long term assets 5,811us-gaap_OtherAmortizationOfDeferredCharges 4,598us-gaap_OtherAmortizationOfDeferredCharges 2,925us-gaap_OtherAmortizationOfDeferredCharges
Amortization of discounted liabilities 324us-gaap_AmortizationOfDebtDiscountPremium 174us-gaap_AmortizationOfDebtDiscountPremium 818us-gaap_AmortizationOfDebtDiscountPremium
Stock-based compensation 4,153us-gaap_EmployeeBenefitsAndShareBasedCompensation 3,819us-gaap_EmployeeBenefitsAndShareBasedCompensation 2,950us-gaap_EmployeeBenefitsAndShareBasedCompensation
Tax benefit from exercise of stock options (300)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (440)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (621)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Increase (decrease) in deferred income taxes 2,619us-gaap_DeferredIncomeTaxExpenseBenefit 2,523us-gaap_DeferredIncomeTaxExpenseBenefit (886)us-gaap_DeferredIncomeTaxExpenseBenefit
Operating loss from equity method investment 983us-gaap_IncomeLossFromEquityMethodInvestments 986us-gaap_IncomeLossFromEquityMethodInvestments  
Gain from dilution of equity method investment (954)us-gaap_GainLossOnSaleOfEquityInvestments    
Changes in assets and liabilities associated with operations:      
(Increase) decrease in net receivables (13,471)us-gaap_IncreaseDecreaseInReceivables 2,351us-gaap_IncreaseDecreaseInReceivables (7,505)us-gaap_IncreaseDecreaseInReceivables
Increase in inventories (25,801)us-gaap_IncreaseDecreaseInInventories (51,879)us-gaap_IncreaseDecreaseInInventories (16,883)us-gaap_IncreaseDecreaseInInventories
Decrease (increase) in income tax receivable/payable, net 4,424us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable (10,961)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable 2,137us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Increase in prepaid expenses and other assets (4,743)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (19,733)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (23,725)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
(Decrease) increase in accounts payable (19,951)us-gaap_IncreaseDecreaseInAccountsPayable 8,252us-gaap_IncreaseDecreaseInAccountsPayable 9,781us-gaap_IncreaseDecreaseInAccountsPayable
(Decrease) increase in deferred revenue (2,890)us-gaap_IncreaseDecreaseInDeferredRevenue (16,639)us-gaap_IncreaseDecreaseInDeferredRevenue 12,856us-gaap_IncreaseDecreaseInDeferredRevenue
(Decrease) increase in other payables and accrued expenses (4,697)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 21,958us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 8,264us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash (used in) provided by operating activities (34,095)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (6,214)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 40,424us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Capital expenditures (7,180)us-gaap_PaymentsForCapitalImprovements (15,260)us-gaap_PaymentsForCapitalImprovements (17,628)us-gaap_PaymentsForCapitalImprovements
Investment (500)us-gaap_PaymentsToAcquireInvestments (3,687)us-gaap_PaymentsToAcquireInvestments  
Acquisitions of intangible assets     (3,473)us-gaap_PaymentsToAcquireIntangibleAssets
Net cash used in investing activities (7,680)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (18,947)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (21,101)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Net borrowings under line of credit agreement 47,850us-gaap_ProceedsFromRepaymentsOfLinesOfCredit 51,550us-gaap_ProceedsFromRepaymentsOfLinesOfCredit  
Payments on long-term debt   (46,000)us-gaap_RepaymentsOfLongTermDebt (8,443)us-gaap_RepaymentsOfLongTermDebt
Payment on other long-term liabilities (1,756)us-gaap_RepaymentsOfOtherLongTermDebt (1,831)us-gaap_RepaymentsOfOtherLongTermDebt (6,035)us-gaap_RepaymentsOfOtherLongTermDebt
Tax benefit from exercise of stock options 300us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 440us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 621us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Decrease in other notes payable   (6,154)us-gaap_ProceedsFromRepaymentsOfNotesPayable (51)us-gaap_ProceedsFromRepaymentsOfNotesPayable
Repurchases of common stock (1,531)us-gaap_PaymentsForRepurchaseOfCommonStock (1,934)us-gaap_PaymentsForRepurchaseOfCommonStock  
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options) 1,666us-gaap_ProceedsFromIssuanceOfCommonStock 1,610us-gaap_ProceedsFromIssuanceOfCommonStock 3,227us-gaap_ProceedsFromIssuanceOfCommonStock
Non-controlling interest contribution 299us-gaap_ProceedsFromPaymentsToMinorityShareholders   400us-gaap_ProceedsFromPaymentsToMinorityShareholders
Payment of cash dividends (5,672)us-gaap_PaymentsOfDividends (4,804)us-gaap_PaymentsOfDividends (6,148)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities 41,156us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (7,123)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (16,429)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (decrease) increase in cash (619)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (32,284)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,894us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Effect of exchange rate changes on cash (1,176)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 488us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 497us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Cash and cash equivalents at beginning of year 6,680us-gaap_CashAndCashEquivalentsAtCarryingValue 38,476us-gaap_CashAndCashEquivalentsAtCarryingValue 35,085us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 4,885us-gaap_CashAndCashEquivalentsAtCarryingValue 6,680us-gaap_CashAndCashEquivalentsAtCarryingValue 38,476us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid (received) during the year for:      
Interest 2,298us-gaap_InterestPaid 1,777us-gaap_InterestPaid 1,891us-gaap_InterestPaid
Income taxes $ (8,206)us-gaap_IncomeTaxesPaid $ 25,271us-gaap_IncomeTaxesPaid $ 18,048us-gaap_IncomeTaxesPaid