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Stock-Based Compensation (Summary Of Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Options      
Outstanding (in shares) 1,797,493 2,064,253 2,224,169
Granted (in shares) 257,111 293,284 260,930
Exercised (in shares) (282,720) (546,931) (392,887)
Forfeited (in shares) (24,810) (13,113) (27,959)
Outstanding (in shares) 1,747,074 1,797,493 2,064,253
Unvested (in shares) 830,076    
Exercisable (in shares) 916,998    
Weighted- Average Exercise Price      
Outstanding (in dollars per share) $ 73.95 $ 60.65 $ 53.82
Granted (in dollars per share) 232.26 124.57 82.84
Exercised (in dollars per share) 58.94 50.50 35.81
Forfeited (in dollars per share) 131.36 90.81 72.87
Outstanding (in dollars per share) 98.93 $ 73.95 $ 60.65
Unvested (in dollars per share) 140.80    
Exercisable (in dollars per share) $ 61.03    
Additional Disclosures      
Outstanding, Weighted-average remaining contractual life 5 years 9 months 18 days 6 years 7 days 6 years 14 days
Unvested, Weighted-average remaining contractual life 7 years 9 months 25 days    
Exercisable, Weighted-average remaining contractual life 3 years 11 months 15 days    
Outstanding, Aggregate intrinsic value $ 58,084 $ 251,970 $ 78,556
Unvested, Aggregate intrinsic value 9,179    
Exercisable, Aggregate intrinsic value $ 48,905