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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
NET REVENUES $ 82,557us-gaap_Revenues $ 83,073us-gaap_Revenues
COST OF REVENUES 40,265us-gaap_CostOfRevenue 37,096us-gaap_CostOfRevenue
GROSS PROFIT 42,292us-gaap_GrossProfit 45,977us-gaap_GrossProfit
OPERATING EXPENSES:    
Research and development 14,941us-gaap_ResearchAndDevelopmentExpense 13,490us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 12,113us-gaap_SellingAndMarketingExpense 12,110us-gaap_SellingAndMarketingExpense
General and administrative 8,281us-gaap_GeneralAndAdministrativeExpense 7,646us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 35,335us-gaap_OperatingExpenses 33,246us-gaap_OperatingExpenses
INCOME FROM OPERATIONS 6,957us-gaap_OperatingIncomeLoss 12,731us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)    
Other income (expense), net (223)us-gaap_OtherNonoperatingIncomeExpense 257us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) (223)us-gaap_NonoperatingIncomeExpense 257us-gaap_NonoperatingIncomeExpense
INCOME BEFORE INCOME TAXES 6,734us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 12,988us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
PROVISION FOR INCOME TAXES 391us-gaap_IncomeTaxExpenseBenefit 625us-gaap_IncomeTaxExpenseBenefit
NET INCOME $ 6,343us-gaap_NetIncomeLoss $ 12,363us-gaap_NetIncomeLoss
EARNINGS PER SHARE:    
Basic (in dollars per share) $ 0.22us-gaap_EarningsPerShareBasic $ 0.41us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.21us-gaap_EarningsPerShareDiluted [1] $ 0.40us-gaap_EarningsPerShareDiluted [1]
SHARES USED IN PER SHARE CALCULATION:    
Basic (in shares) 29,309us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 30,239us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 30,058us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 31,167us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1]
[1] The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the 2015 and 2014 awards in the 2015 and 2014 calculations, respectively, as those shares were not contingently issuable as of the end of the period.