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Stock-Based Compensation Plans (Schedule Of Total Stock Option, Stock Award And PSU Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options, Granted 312,598 326,806 298,670
Weighted Average Grant-Date Price, Granted $ 496.25 $ 482.66 $ 466.43
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options, Outstanding at January 1, 2020 1,154,037    
Number of Options, Granted 312,598    
Number of Options, Exercised/Vested (256,841)    
Number of Options, Canceled/Forfeited (28,640)    
Number of Options, Outstanding at December 31, 2020 1,181,154 1,154,037  
Number of Options, Vested and expected to vest at December 31, 2020 1,181,154    
Number of Options, Exercisable at December 31, 2020 568,258    
Weighted Average Exercise Price, Outstanding at January 1, 2020 $ 392.46    
Weighted Average Exercise Price, Granted 462.04    
Weighted Average Exercise Price, Exercised/Vested 285.35    
Weighted Average Exercise Price, Canceled/Forfeited 450.91    
Weighted Average Exercise Price, Outstanding at December 31, 2020 432.75 $ 392.46  
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 432.75    
Weighted Average Exercise Price, Exercisable at December 31, 2020 $ 405.75    
Weighted Average Remaining Contractual Life (Years), Outstanding at December 31, 2020 3 years 3 months 18 days    
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest at December 31, 2020 3 years 3 months 18 days    
Weighted Average Remaining Contractual Life (Years), Exercisable at December 31, 2020 2 years 4 months 24 days    
Aggregate Intrinsic Value, Outstanding at December 31, 2020 $ 90,463    
Aggregate Intrinsic Value, Vested and dxpected to vest at December 31, 2020 90,463    
Aggregate Intrinsic Value, Exercisable at December 31, 2020 $ 58,867    
Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Awards, Outstanding at January 1, 2020    
Number of Awards, Granted 2,358    
Number of Awards, Exercised/Vested (2,358)    
Number of Awards, Canceled/ Forfeited    
Number of Awards, Outstanding at December 31, 2020  
Number of Awards, Vested and expected to vest at December 31, 2020    
Weighted Average Grant-Date Price, Outstanding at January 1, 2020    
Weighted Average Grant-Date Price, Granted 496.25    
Weighted Average Grant-Date Price, Exercised/Vested 496.25    
Weighted Average Grant-Date Price, Canceled/Forfeited    
Weighted Average Grant-Date Price, Outstanding at December 31, 2020  
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020    
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Nonvested Target Units, Outstanding at January 1, 2020 35,834    
Number of Nonvested Target Units, Granted 25,072    
Number of Nonvested Target Units, Exercised/Vested (22,736)    
Number of Nonvested Target Units, Canceled/Forfeited (680)    
Number of Nonvested Target Units, Outstanding at December 31, 2020 37,490 35,834  
Number of Nonvested Target Units, Vested and expected to vest at December 31, 2020 45,747    
Weighted Average Grant-Date Price, Outstanding at January 1, 2020 $ 487.29    
Weighted Average Grant-Date Price, Granted 462.79    
Weighted Average Grant-Date Price, Exercised/Vested 366.63    
Weighted Average Grant-Date Price, Canceled/Forfeited 540.91    
Weighted Average Grant-Date Price, Outstanding at December 31, 2020 543.11 $ 487.29  
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 $ 544.91