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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 121,485us-gaap_NetIncomeLoss $ 73,573us-gaap_NetIncomeLoss $ 68,098us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operations:      
Stock-based compensation expense 15,158us-gaap_StockOptionPlanExpense 10,620us-gaap_StockOptionPlanExpense 8,520us-gaap_StockOptionPlanExpense
Depreciation of property, plant, and equipment 8,443us-gaap_Depreciation 7,305us-gaap_Depreciation 6,721us-gaap_Depreciation
Amortization of intangible assets 4,024us-gaap_AmortizationOfIntangibleAssets 3,797us-gaap_AmortizationOfIntangibleAssets 4,137us-gaap_AmortizationOfIntangibleAssets
Amortization of discounts or premiums on investments 1,823us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 2,519us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 5,735us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Realized (gain) loss on sale of investments (673)us-gaap_GainLossOnSaleOfInvestments 403us-gaap_GainLossOnSaleOfInvestments (1,625)us-gaap_GainLossOnSaleOfInvestments
Change in deferred income taxes (2,364)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 2,234us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 429us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Tax effect of stock option exercises (7,871)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (7,658)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (3,594)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Accounts receivable (915)us-gaap_IncreaseDecreaseInAccountsReceivable (11,311)us-gaap_IncreaseDecreaseInAccountsReceivable 5,035us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (11,750)us-gaap_IncreaseDecreaseInInventories 666us-gaap_IncreaseDecreaseInInventories 1,872us-gaap_IncreaseDecreaseInInventories
Accounts payable 10,896us-gaap_IncreaseDecreaseInAccountsPayable 2,644us-gaap_IncreaseDecreaseInAccountsPayable (246)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses 7,812us-gaap_IncreaseDecreaseInAccruedLiabilities 5,593us-gaap_IncreaseDecreaseInAccruedLiabilities (1,974)us-gaap_IncreaseDecreaseInAccruedLiabilities
Accrued income taxes 7,700us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 7,968us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 3,363us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Deferred revenue and customer deposits 5,893us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits 3,228us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits (761)us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits
Other (3,691)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (6,126)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 5,421us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 155,970us-gaap_NetCashProvidedByUsedInOperatingActivities 95,455us-gaap_NetCashProvidedByUsedInOperatingActivities 101,131us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Purchases of investments (422,633)us-gaap_PaymentsToAcquireInvestments (370,781)us-gaap_PaymentsToAcquireInvestments (460,486)us-gaap_PaymentsToAcquireInvestments
Maturities and sales of investments 339,470us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 296,091us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 431,510us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Purchases of property, plant, and equipment (20,934)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (9,630)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (9,878)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash paid for purchased technology   (3,750)us-gaap_PaymentsToAcquireIntangibleAssets 0us-gaap_PaymentsToAcquireIntangibleAssets
Net cash used in investing activities (104,097)us-gaap_NetCashProvidedByUsedInInvestingActivities (88,070)us-gaap_NetCashProvidedByUsedInInvestingActivities (38,854)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Issuance of common stock under stock option plans 16,930us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 27,792us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 17,468us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Payment of dividends 0us-gaap_PaymentsOfDividendsCommonStock 0us-gaap_PaymentsOfDividendsCommonStock (66,213)us-gaap_PaymentsOfDividendsCommonStock
Repurchase of common stock (59,673)us-gaap_PaymentsForRepurchaseOfCommonStock (47,908)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Tax effect of stock option exercises 7,871us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 7,658us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 3,594us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used in financing activities (34,872)us-gaap_NetCashProvidedByUsedInFinancingActivities (12,458)us-gaap_NetCashProvidedByUsedInFinancingActivities (45,151)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of foreign exchange rate changes on cash and cash equivalents (1,951)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 557us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (10,069)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net change in cash and cash equivalents 15,050us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (4,516)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 7,057us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 40,644us-gaap_CashAndCashEquivalentsAtCarryingValue 45,160us-gaap_CashAndCashEquivalentsAtCarryingValue 38,103us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year $ 55,694us-gaap_CashAndCashEquivalentsAtCarryingValue $ 40,644us-gaap_CashAndCashEquivalentsAtCarryingValue $ 45,160us-gaap_CashAndCashEquivalentsAtCarryingValue