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Share-Based Compensation and Benefit Plans (Summary of Stock Options) (Details) - Stock option [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-Based Compensation and Benefit Plans      
Exercisable at the end of the year, average remaining contractual term 4 years 6 months 4 years 7 months 6 days 4 years 4 months 24 days
Employee stock option [Member]      
Share-Based Compensation and Benefit Plans      
Outstanding at December 31, 2019, shares 1,635    
Outstanding at December 31, 2019, weighted-average exercise price $ 218.10    
Granted, shares 175    
Granted, weighted-average exercise price $ 394.79    
Exercised, shares (288)    
Exercised, weighted-average exercise price $ 160.67    
Forfeited or expired, shares (22)    
Forfeited or expired, weighted-average exercise price $ 302.55    
Outstanding at December 31, 2020, shares 1,500 1,635  
Outstanding at December 31, 2020, weighted-average exercise price $ 248.52 $ 218.10  
Outstanding at the end of the year, average remaining contractual term 5 years 8 months 12 days    
Outstanding at the end of the year, aggregate intrinsic value $ 306,095    
Vested or expected to vest at the end of the year, shares 1,470    
Vested or expected to vest at the end of the year, weighted-average exercise price $ 246.44    
Vested or expected to vest at the end of the year, average remaining contractual term 5 years 8 months 12 days    
Vested or expected to vest at the end of the year, aggregate intrinsic value $ 302,927    
Exercisable at December 31, 2020, shares 988    
Exercisable at December 31, 2020, weighted-average exercise price $ 202.19    
Exercisable at the end of the year, average remaining contractual term 4 years 6 months    
Exercisable at the end of the year, aggregate intrinsic value $ 247,419