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Share-Based Compensation (Schedule Of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Options outstanding, January 1 920,346 859,182 541,679
Options outstanding, December 31 1,004,014 920,346 859,182
Options exercisable, December 31 530,163    
Weighted Average Exercise Price, Options outstanding, January 1 $ 69.24 $ 70.11 $ 65.84
Weighted Average Exercise Price, Options outstanding, December 31 74.35 $ 69.24 $ 70.11
Weighted Average Exercise Price, Options exercisable, December 31 $ 73.93    
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 3 years 2 months 26 days    
Weighted Average Remaining Contractual Life (Years), Options exercisable, December 31 2 years 10 months 28 days    
Aggregate Intrinsic Value, Options outstanding, December 31 $ 7,157    
Aggregate Intrinsic Value, Options exercisable, December 31 $ 4,001    
2005 Plan [Member]      
Options granted   0 0
Options exercised   (6,668) (15,000)
Weighted Average Exercise Price, Options granted   $ 0.00 $ 0.00
Weighted Average Exercise Price, Options exercised   $ 72.11 $ 47.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 0    
Weighted Average Exercise Price, Options forfeited $ 0.00    
2012 Plan [Member]      
Options granted 685,334 560,000 495,000
Options exercised (501,664) (462,167) (155,829)
Options forfeited   (30,001) (6,668)
Weighted Average Exercise Price, Options granted $ 79.08 $ 64.33 $ 74.90
Weighted Average Exercise Price, Options exercised $ 71.52 65.03 65.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (100,002)    
Weighted Average Exercise Price, Options forfeited $ 73.89 $ 66.73 $ 60.52
Grant Date 2-20-2015      
Options outstanding, December 31 20,000    
Weighted Average Exercise Price, Options outstanding, December 31 $ 72.11    
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 1 month 20 days    
Grant Date 2-22-2016      
Options outstanding, December 31 20,000    
Weighted Average Exercise Price, Options outstanding, December 31 $ 60.52    
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 1 year 1 month 24 days    
Grant Date 2-22-2017      
Options outstanding, December 31 121,669    
Weighted Average Exercise Price, Options outstanding, December 31 $ 74.78    
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 2 years 1 month 24 days    
Grant Date 2-20-2018 [Member]      
Options outstanding, December 31 246,177    
Weighted Average Exercise Price, Options outstanding, December 31 $ 64.33    
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 3 years 1 month 20 days    
Grant Date 2-21-2019 [Member]      
Options outstanding, December 31 512,834    
Weighted Average Exercise Price, Options outstanding, December 31 $ 79.96    
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 4 years 1 month 24 days    
Grant Date 11-7-2019 [Member]      
Options outstanding, December 31 83,334    
Weighted Average Exercise Price, Options outstanding, December 31 $ 72.67    
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 10 months 6 days