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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Condensed Consolidated Statements of Income    
Revenues $ 163,705us-gaap_SalesRevenueNet $ 145,691us-gaap_SalesRevenueNet
Cost of revenues 67,336us-gaap_CostOfGoodsSold 58,586us-gaap_CostOfGoodsSold
Gross margin 96,369us-gaap_GrossProfit 87,105us-gaap_GrossProfit
Operating expenses:    
Research and development 46,857us-gaap_ResearchAndDevelopmentExpense 42,485us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 42,300us-gaap_SellingGeneralAndAdministrativeExpense 34,611us-gaap_SellingGeneralAndAdministrativeExpense
Operating expenses 89,157us-gaap_OperatingExpenses 77,096us-gaap_OperatingExpenses
Operating income 7,212us-gaap_OperatingIncomeLoss 10,009us-gaap_OperatingIncomeLoss
Other income (expense):    
Interest income 192us-gaap_InvestmentIncomeInterest 302us-gaap_InvestmentIncomeInterest
Interest expense (745)us-gaap_InterestExpense (798)us-gaap_InterestExpense
Other income (expense), net 408us-gaap_OtherNonoperatingIncomeExpense 67us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes 7,067us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 9,580us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 689us-gaap_IncomeTaxExpenseBenefit 1,470us-gaap_IncomeTaxExpenseBenefit
Net income $ 6,378us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 8,110us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per share:    
Basic (in dollars per share) $ 0.15us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.15us-gaap_EarningsPerShareDiluted $ 0.18us-gaap_EarningsPerShareDiluted
Weighted-average common shares outstanding:    
Basic (in shares) 42,412us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43,081us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 43,149us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 44,056us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding