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Consolidated Statements of Operations and Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Revenues:      
Products $ 673,819us-gaap_SalesRevenueGoodsNet $ 568,317us-gaap_SalesRevenueGoodsNet $ 536,774us-gaap_SalesRevenueGoodsNet
Services 107,050us-gaap_SalesRevenueServicesNet 101,103us-gaap_SalesRevenueServicesNet 106,734us-gaap_SalesRevenueServicesNet
Total net revenues 780,869us-gaap_SalesRevenueNet 669,420us-gaap_SalesRevenueNet 643,508us-gaap_SalesRevenueNet
Cost of revenues:      
Cost of products 374,200us-gaap_CostOfGoodsSold 337,464us-gaap_CostOfGoodsSold 310,485us-gaap_CostOfGoodsSold
Cost of service 68,903us-gaap_CostOfServices 65,382us-gaap_CostOfServices 63,544us-gaap_CostOfServices
Total cost of revenues (exclusive of amortization shown separately below) 443,103us-gaap_CostOfGoodsAndServicesSold 402,846us-gaap_CostOfGoodsAndServicesSold 374,029us-gaap_CostOfGoodsAndServicesSold
Gross profit 337,766us-gaap_GrossProfit 266,574us-gaap_GrossProfit 269,479us-gaap_GrossProfit
Research and development 62,888us-gaap_ResearchAndDevelopmentExpense 63,570us-gaap_ResearchAndDevelopmentExpense 60,118us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 131,828us-gaap_SellingGeneralAndAdministrativeExpense 142,014us-gaap_SellingGeneralAndAdministrativeExpense 127,185us-gaap_SellingGeneralAndAdministrativeExpense
Litigation     5,316us-gaap_LitigationSettlementExpense
Insurance reimbursement   (1,071)us-gaap_InsuranceRecoveries  
Acquisition costs 499us-gaap_BusinessCombinationAcquisitionRelatedCosts 171us-gaap_BusinessCombinationAcquisitionRelatedCosts 1,258us-gaap_BusinessCombinationAcquisitionRelatedCosts
Restructuring 2,464us-gaap_RestructuringCharges 1,364us-gaap_RestructuringCharges 343us-gaap_RestructuringCharges
Amortization of intangible assets 4,945us-gaap_AmortizationOfIntangibleAssets 2,139us-gaap_AmortizationOfIntangibleAssets 1,036us-gaap_AmortizationOfIntangibleAssets
Income from operations 135,142us-gaap_OperatingIncomeLoss 58,387us-gaap_OperatingIncomeLoss 74,223us-gaap_OperatingIncomeLoss
Interest income 1,323us-gaap_InterestAndOtherIncome 999us-gaap_InterestAndOtherIncome 1,059us-gaap_InterestAndOtherIncome
Interest expense 72us-gaap_InterestExpense 85us-gaap_InterestExpense 146us-gaap_InterestExpense
Income before income taxes 136,393us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 59,301us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 75,136us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 20,615us-gaap_IncomeTaxExpenseBenefit 23,525us-gaap_IncomeTaxExpenseBenefit 27,107us-gaap_IncomeTaxExpenseBenefit
Net income 115,778us-gaap_NetIncomeLoss 35,776us-gaap_NetIncomeLoss 48,029us-gaap_NetIncomeLoss
Other comprehensive income:      
Changes in value of financial instruments designated as cash flow hedges, net of tax expense 1,210us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1] 62us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1] 150us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1]
Foreign currency translation adjustments, net of tax of $0 for 2014, 2013 and 2012 (14,707)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (3,604)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 1,664us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized (loss) gain on investments, net of tax (benefit) expense (460)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [2] (40)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [2] 31us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [2]
Total comprehensive income $ 101,821us-gaap_ComprehensiveIncomeNetOfTax $ 32,194us-gaap_ComprehensiveIncomeNetOfTax $ 49,874us-gaap_ComprehensiveIncomeNetOfTax
Net income per share:      
Basic $ 2.17us-gaap_EarningsPerShareBasic $ 0.67us-gaap_EarningsPerShareBasic $ 0.91us-gaap_EarningsPerShareBasic
Diluted $ 2.16us-gaap_EarningsPerShareDiluted $ 0.67us-gaap_EarningsPerShareDiluted $ 0.90us-gaap_EarningsPerShareDiluted
Cash dividends paid per common share $ 0.655us-gaap_CommonStockDividendsPerShareCashPaid $ 0.640us-gaap_CommonStockDividendsPerShareCashPaid $ 0.620us-gaap_CommonStockDividendsPerShareCashPaid
Weighted average common shares outstanding:      
Basic 53,232us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 53,061us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 52,686us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 53,515us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 53,481us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 53,234us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] Tax expense was $144, $551 and $88 for the years ended December 31, 2014, 2013 and 2012, respectively.
[2] Tax (benefit) expense was $(55), $(355), and $19 for the years ended December 31, 2014, 2013 and 2012, respectively.