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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]      
Weighted-average number of common shares outstanding 100,325 107,001 114,155
Conversion spread related to Convertible Debentures 23,247 21,074 18,047
Unvested restricted stock units 608 758 829
Shares used to compute diluted net income per share 124,180 128,833 133,031