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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]      
Cash equivalents $ 314,100,000us-gaap_CashEquivalentsAtCarryingValue $ 247,000,000us-gaap_CashEquivalentsAtCarryingValue  
Provision to accounts receivable 2,700,000us-gaap_ProvisionForDoubtfulAccounts    
Long-term investments 1,100,000us-gaap_AvailableForSaleSecuritiesAmortizedCost    
Contractual maturity term 10 years    
Unrealized losses still held 64,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss 1,433,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss  
Fair value of auction rate securities 1,000,000us-gaap_AvailableForSaleSecurities    
Unrealized gains on long-term investments 1,400,000us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax 400,000us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax 1,500,000us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
Anti-dilutive options to purchase common shares 0.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Compensation cost recognized for stock-based awards 6,400,000us-gaap_AllocatedShareBasedCompensationExpense 7,100,000us-gaap_AllocatedShareBasedCompensationExpense 6,300,000us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit recognized in the income statement for stock-based awards 2,600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2,600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2,100,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Weighted-average fair value per option granted $ 9.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 7.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 6.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Total cash received as a result of stock option exercises 18,900,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 11,200,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 4,700,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards 2,900,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 2,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 1,300,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Total intrinsic value of stock options exercised 3,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 3,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Exchange losses related to foreign currency transactions $ 1,300,000us-gaap_ForeignCurrencyTransactionLossBeforeTax $ 900,000us-gaap_ForeignCurrencyTransactionLossBeforeTax $ 1,200,000us-gaap_ForeignCurrencyTransactionLossBeforeTax
Minimum [Member] | Buildings And Building Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 5 years    
Minimum [Member] | Machinery And Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 2 years    
Minimum [Member] | Furniture And Fixtures [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 2 years    
Minimum [Member] | Vehicles [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 2 years    
Maximum [Member] | Buildings And Building Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 40 years    
Maximum [Member] | Machinery And Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 10 years    
Maximum [Member] | Furniture And Fixtures [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 10 years    
Maximum [Member] | Vehicles [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of the assets 5 years