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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Weighted-average number of common shares outstanding 118,194 121,682 118,966 111,046
Conversion spread related to Convertible Debentures 0 0 0 11,452
Unvested RSUs and ESPP 375 579 444 581
Shares used to compute diluted net income per share 118,569 122,261 119,410 123,079