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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Weighted-average number of common shares outstanding 101,060 108,067 101,759 108,829
Conversion spread related to Convertible Debentures 22,530 21,872 21,929 21,472
Unvested RSUs and ESPP 390 649 530 783
Shares used to compute diluted net income per share 123,980 130,588 124,218 131,084