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Equity Incentive Plans (Summary Of Exercisable Options) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 45.20 $ 44.62 $ 45.20 $ 44.62
Exercise price range, upper limit $ 65.50 $ 65.50 $ 65.50 $ 65.50
Options outstanding (in shares) 615,962   615,962  
Weighted avg. life remaining (in years)     4 years 3 months  
Weighted avg. exercise price $ 38.78   $ 38.78  
Aggregate intrinsic value $ 7,667   $ 7,667  
$18.18 - 19.99 [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit     $ 18.18  
Exercise price range, upper limit     $ 19.99  
Options outstanding (in shares) 201,859   201,859  
Weighted avg. life remaining (in years)     5 years 5 months  
20.00 - 29.99 [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit     $ 20.00  
Exercise price range, upper limit     $ 29.99  
Options outstanding (in shares) 0   0  
Weighted avg. life remaining (in years)     0 years  
30.00 - 39.99 [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit     $ 30.00  
Exercise price range, upper limit     $ 39.99  
Options outstanding (in shares) 18,460   18,460  
Weighted avg. life remaining (in years)     3 years 10 months  
40.00 - 49.99 [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit     $ 40.00  
Exercise price range, upper limit     $ 49.99  
Options outstanding (in shares) 292,290   292,290  
Weighted avg. life remaining (in years)     4 years 0 months  
50.00 - 59.99 [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit     $ 50.00  
Exercise price range, upper limit     $ 59.99  
Options outstanding (in shares) 10,000   10,000  
Weighted avg. life remaining (in years)     4 years 7 months  
60.00 - 65.50 [Member]
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit     $ 60.00  
Exercise price range, upper limit     $ 65.50  
Options outstanding (in shares) 93,353   93,353  
Weighted avg. life remaining (in years)     3 years 4 months