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Share-Based Compensation (Schedule Of Stock Option Activity) (Details) - $ / shares
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options outstanding beginning balance (in shares) 2,216,175 1,652,505
Options granted (in shares)   718,000
Options exercised (in shares) (5,166) (56,832)
Options forfeited (in shares) (61,168) (23,000)
Options expired (in shares) (88,170)  
Options outstanding, ending balance (in shares) 2,447,171 2,216,175
Stock Options Weighted Average Exercise Price    
Options outstanding (in US dollars per share) $ 70.97 $ 78.10
Options granted (in US dollars per share)   53.62
Options exercised (in US dollars per share) 53.41 53.41
Options forfeited (in US dollars per share) 66.44 62.33
Options expired (in US dollars per share) 64.33  
Options outstanding (in US dollars per share) $ 68.80 $ 70.97
Stock Options Additional Disclosures    
Options exercisable (in shares) 2,078,827 1,695,155
Options exercisable (in US dollars per share) $ 71.40 $ 74.73
Options outstanding (in years) 2 years 6 months 3 days  
Options exercisable (in years) 2 years 3 months  
2019 Stock Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options granted (in shares) 385,500  
Options expired (in shares)   (74,498)
Stock Options Weighted Average Exercise Price    
Options granted (in US dollars per share) $ 54.73  
Options expired (in US dollars per share)   $ 77.93