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Stock-Based Compensation (Summary Of SOSAR Activity Under Incentive Plan) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Stock-Based Compensation [Abstract]    
Outstanding, beginning of year, Shares 748  
Outstanding, beginning of year, Weighted-Average Exercise Price $ 533.71  
Granted, Shares 82  
Granted, weighted-average exercise price $ 1,510.79  
Exercised, Shares (446)  
Exercised, Weighted-Average Exercise Price $ 448.02  
Forfeited or cancelled, Shares (20)  
Forfeited or cancelled, Weighted-Average Exercise Price $ 913.86  
Outstanding, end of year, Shares 364  
Outstanding, end of year, Weighted-Average Exercise Price $ 838.62  
Outstanding, Weighted-Average Remaining Years of Contractual Life 4 years 8 months 12 days  
Outstanding, Aggregate Intrinsic Value $ 331,352 $ 637,905
Exercisable, Shares 100  
Exercisable, Weighted-Average Exercise Price $ 473.64  
Exercisable, Weighted-Average Remaining Years of Contractual Life 3 years 4 months 24 days  
Exercisable, Aggregate Intrinsic Value $ 127,918  
Vested and expected to vest, shares 353  
Vested and expected to vest, Weighted-Average Exercise Price $ 823.91  
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life 4 years 7 months 6 days  
Vested and expected to vest, Aggregate Intrinsic Value $ 326,444