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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Weighted-average number of common shares outstanding 106,307 112,955 107,982 115,235
Conversion spread related to Convertible Debentures 20,789 18,024 21,244 16,936
Unvested RSUs, stock options, and ESPP 654 742 741 754
Shares used to compute diluted net income per share 127,750 131,721 129,967 132,925