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Calculation Of Net Income Per Share (Weighted-Average Shares Used In Calculation Of Basic And Diluted EPS) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Stock Issued During Period, Shares, Conversion of Convertible Securities			26,100
Weighted-average number of common shares outstanding	113,936	101,060	105,639	101,759
Conversion spread related to Convertible Debentures	8,776	22,530	17,178	21,929
Unvested RSUs and ESPP	488	390	582	530
Shares used to compute diluted net income per share	123,200	123,980	123,399	124,218

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Number of additional shares included in diluted EPS for potentially dilutive effect of nonvested equity-based payment award containing forfeitable rights to dividends or dividend equivalents, whether paid or unpaid.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Additional Shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the treasury stock method.

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