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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income $ 14,205us-gaap_NetIncomeLoss $ 19,125us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation 10,933us-gaap_Depreciation 9,640us-gaap_Depreciation
Amortization 1,205us-gaap_AdjustmentForAmortization 1,158us-gaap_AdjustmentForAmortization
Deferred income taxes 1,818us-gaap_DeferredIncomeTaxesAndTaxCredits 3,293us-gaap_DeferredIncomeTaxesAndTaxCredits
(Gain) loss on the sale of property, plant and equipment (14)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 393us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Asset impairments 84us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges
Thailand flood insurance recovery 0us-gaap_InsuranceRecoveries (550)us-gaap_InsuranceRecoveries
Stock-based compensation expense 1,940us-gaap_ShareBasedCompensation 1,432us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation (328)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (426)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities, net of effects from business acquisitions:    
Accounts receivable 28,361us-gaap_IncreaseDecreaseInAccountsReceivable 94,818us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (26,914)us-gaap_IncreaseDecreaseInInventories (46,512)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (4,432)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,029)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (32,978)us-gaap_IncreaseDecreaseInAccountsPayableTrade (21,147)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued liabilities (5,074)us-gaap_IncreaseDecreaseInAccruedLiabilities 1,189us-gaap_IncreaseDecreaseInAccruedLiabilities
Income taxes 289us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (650)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided by (used in) operations (10,905)us-gaap_NetCashProvidedByUsedInOperatingActivities 60,734us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Proceeds from sales and redemptions of investments 1us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 6us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Additions to property, plant and equipment (16,312)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (14,512)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from the sale of property, plant and equipment 412us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 106us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Additions to purchased software (515)us-gaap_PaymentsForSoftware (104)us-gaap_PaymentsForSoftware
Thailand flood property insurance proceeds 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 550us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Other 55us-gaap_PaymentsForProceedsFromOtherInvestingActivities 363us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (16,359)us-gaap_NetCashProvidedByUsedInInvestingActivities (13,591)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Proceeds from stock options exercised 821us-gaap_ProceedsFromStockOptionsExercised 5,811us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefits from stock-based compensation 328us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 426us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Principal payments on capital lease obligations (155)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities (132)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Share repurchases (15,778)us-gaap_PaymentsForRepurchaseOfCommonStock (4,537)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash provided by (used in) financing activities (14,784)us-gaap_NetCashProvidedByUsedInFinancingActivities 1,568us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes (1,732)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (72)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents (43,780)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 48,639us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 427,376us-gaap_CashAndCashEquivalentsAtCarryingValue 345,555us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 383,596us-gaap_CashAndCashEquivalentsAtCarryingValue $ 394,194us-gaap_CashAndCashEquivalentsAtCarryingValue