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

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