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Stockholders' Equity (Schedule Of Summary Of Activity Under Stock Option Plans) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stockholders' Equity [Abstract]      
Shares, Outstanding, beginning of year 60,251 69,193 76,811
Shares, Granted and assumed 2,445 4,836 7,286
Shares, Forfeited (1,523) (2,348) (2,393)
Shares, Expired (1,117) (759) (440)
Shares, Exercised (9,175) (10,671) (12,071)
Shares, Outstanding, end of year 50,881 60,251 69,193
Shares, Exercisable, end of year 41,418 45,018 47,090
Weighted- Average Exercise Price, Outstanding, beginning of year $ 30.32 $ 28.09 $ 24.70
Weighted- Average Exercise Price, Granted and assumed $ 38.35 $ 44.27 $ 48.87
Weighted- Average Exercise Price, Forfeited $ 43.33 $ 43.16 $ 39.33
Weighted- Average Exercise Price, Expired $ 47.83 $ 53.27 $ 64.08
Weighted- Average Exercise Price, Exercised $ 19.26 $ 17.68 $ 15.56
Weighted- Average Exercise Price, Outstanding, end of year $ 31.91 $ 30.32 $ 28.09
Weighted- Average Exercise Price, Exercisable, end of year $ 29.22 $ 25.92 $ 22.36
Weighted-average grant date fair value of options granted during the year $ 12.33 $ 14.24 $ 17.00