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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenue $ 344,517us-gaap_Revenues $ 351,542us-gaap_Revenues
Cost of goods sold 168,620us-gaap_CostOfGoodsSold 183,010us-gaap_CostOfGoodsSold
Gross profit 175,897us-gaap_GrossProfit 168,532us-gaap_GrossProfit
Operating expenses:    
Research and development 34,694us-gaap_ResearchAndDevelopmentExpense 36,326us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 75,135us-gaap_SellingGeneralAndAdministrativeExpense 81,942us-gaap_SellingGeneralAndAdministrativeExpense
Restructuring expenses 314us-gaap_RestructuringCharges 7,813us-gaap_RestructuringCharges
Total operating expenses 110,143us-gaap_OperatingExpenses 126,081us-gaap_OperatingExpenses
Earnings from operations 65,754us-gaap_OperatingIncomeLoss 42,451us-gaap_OperatingIncomeLoss
Interest expense 3,661us-gaap_InterestExpense 3,708us-gaap_InterestExpense
Interest income (247)us-gaap_InvestmentIncomeInterest (264)us-gaap_InvestmentIncomeInterest
Other income, net (700)us-gaap_OtherNonoperatingIncomeExpense (198)us-gaap_OtherNonoperatingIncomeExpense
Earnings before income taxes 63,040us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 39,205us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision 15,130us-gaap_IncomeTaxExpenseBenefit 9,311us-gaap_IncomeTaxExpenseBenefit
Net earnings $ 47,910us-gaap_NetIncomeLoss $ 29,894us-gaap_NetIncomeLoss
Earnings per share:    
Basic $ 0.34us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic
Diluted $ 0.34us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:    
Basic 139,768us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 140,932us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 141,472us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 143,828us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding