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Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net revenues:    
Products $ 186,096us-gaap_SalesRevenueGoodsNet $ 181,186us-gaap_SalesRevenueGoodsNet
Services 27,743us-gaap_SalesRevenueServicesNet 25,167us-gaap_SalesRevenueServicesNet
Total net revenues 213,839us-gaap_SalesRevenueNet 206,353us-gaap_SalesRevenueNet
Cost of revenues:    
Cost of products 98,652us-gaap_CostOfGoodsSold 100,211us-gaap_CostOfGoodsSold
Cost of services 18,141us-gaap_CostOfServices 16,770us-gaap_CostOfServices
Total cost of revenues (exclusive of amortization shown separately below) 116,793us-gaap_CostOfGoodsAndServicesSold 116,981us-gaap_CostOfGoodsAndServicesSold
Gross profit 97,046us-gaap_GrossProfit 89,372us-gaap_GrossProfit
Research and development 16,680us-gaap_ResearchAndDevelopmentExpense 15,618us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 30,867us-gaap_SellingGeneralAndAdministrativeExpense 34,591us-gaap_SellingGeneralAndAdministrativeExpense
Acquisition costs 30us-gaap_BusinessCombinationAcquisitionRelatedCosts 228us-gaap_BusinessCombinationAcquisitionRelatedCosts
Restructuring 788us-gaap_RestructuringCharges 747us-gaap_RestructuringCharges
Amortization of intangible assets 1,671us-gaap_AmortizationOfIntangibleAssets 410us-gaap_AmortizationOfIntangibleAssets
Income from operations 47,010us-gaap_OperatingIncomeLoss 37,778us-gaap_OperatingIncomeLoss
Interest income 541us-gaap_InterestAndOtherIncome 252us-gaap_InterestAndOtherIncome
Interest expense 37us-gaap_InterestExpense 17us-gaap_InterestExpense
Income before income taxes 47,514us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 38,013us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 13,728us-gaap_IncomeTaxExpenseBenefit 6,768us-gaap_IncomeTaxExpenseBenefit
Net income 33,786us-gaap_NetIncomeLoss 31,245us-gaap_NetIncomeLoss
Other comprehensive income:    
Changes in value of financial instruments designated as cash flow hedges, net of tax benefit (822)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1] (163)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1]
Foreign currency translation adjustments, net of tax of $0 (3,206)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 21us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized gain on investments, net of tax expense 334us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [2] 36us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [2]
Total comprehensive income $ 30,092us-gaap_ComprehensiveIncomeNetOfTax $ 31,139us-gaap_ComprehensiveIncomeNetOfTax
Net income per share:    
Basic $ 0.63us-gaap_EarningsPerShareBasic $ 0.58us-gaap_EarningsPerShareBasic
Diluted $ 0.63us-gaap_EarningsPerShareDiluted $ 0.58us-gaap_EarningsPerShareDiluted
Cash dividends per common share $ 0.165us-gaap_CommonStockDividendsPerShareCashPaid $ 0.160us-gaap_CommonStockDividendsPerShareCashPaid
Weighted average common shares outstanding:    
Basic 53,214us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 53,411us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 53,529us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 53,776us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] Tax benefit was $133 and $108 for the three months ended March 31, 2015 and 2014, respectively.
[2] Tax expense was $54 and $24 for the three months ended March 31, 2015 and 2014, respectively.