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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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Weighted-average number of common shares outstanding 113,452 100,325 107,001
Conversion spread related to Convertible Debentures 8,589 23,247 21,074
Unvested restricted stock units 620 608 758
Shares used to compute diluted net income per share 122,661 124,180 128,833