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Stock-Based Compensation (Summary Of Stock Award Activity Under Incentive Plan) (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Restricted Stock Units - 2011 Stock Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, beginning of year, Shares | shares 121
Outstanding, beginning of year, Grant Date Fair Value | $ / shares $ 408.56
Granted, Shares | shares 42
Granted, Grant Date Fair Value | $ / shares $ 905.96
Vested, Shares | shares (60)
Vested, Grant Date Fair Value | $ / shares $ 381.71
Forfeited, Shares | shares (11)
Forfeited, Grant Date Fair Value | $ / shares $ 619.11
Outstanding, end of year, Shares | shares 92
Outstanding, end of year, Grant Date Fair Value | $ / shares $ 631.66
Vested and expected to vest, end of year, Shares | shares 84
Vested and expected to vest, end of year, Grant Date Fair Value | $ / shares $ 618.08
Performance Shares - 2011 Stock Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, beginning of year, Shares | shares 103
Outstanding, beginning of year, Grant Date Fair Value | $ / shares $ 479.83
Granted, Shares | shares 27
Granted, Grant Date Fair Value | $ / shares $ 853.03
Vested, Shares | shares (29)
Vested, Grant Date Fair Value | $ / shares $ 466.22
Expired, Shares | shares (1)
Expired, Grant Date Fair Value | $ / shares $ 605.39
Outstanding, end of year, Shares | shares 100
Outstanding, end of year, Grant Date Fair Value | $ / shares $ 583.46
Vested and expected to vest, end of year, Shares | shares 229
Vested and expected to vest, end of year, Grant Date Fair Value | $ / shares $ 765.23