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Stockholder's Equity (Summary Of Stock Option Plan Activity) (Details) - $ / shares
 12 Months Ended 104 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Options Outstanding        
Granted (in shares)       13,021,758
Exercised (in shares) (2,325,073) (620,766) (659,224)  
Outstanding as of End of Period (in shares) 6,807,217     6,807,217
Exercisable (in shares) 2,164,067     2,164,067
Stock Option Plan        
Options Outstanding        
Outstanding as of Beginning of Period (in shares) 7,999,264 7,897,816    
Granted (in shares) 1,316,924 1,087,936    
Exercised (in shares) (2,325,073) (620,766)    
Cancelled/forfeited (in shares) (183,898) (365,722)    
Outstanding as of End of Period (in shares) 6,807,217 7,999,264 7,897,816 6,807,217
Exercisable (in shares) 2,164,067 3,108,756   2,164,067
Exercise Price        
Outstanding as of Beginning of Period (in dollars per share) $ 24.765 $ 24.140    
Granted (in dollars per share) 26.000 27.500    
Exercised (in dollars per share) 25.150 21.655    
Cancelled/forfeited (in dollars per share) 24.630 24.430    
Outstanding as of End of Period (in dollars per share) 24.890 24.765 $ 24.140 $ 24.890
Exercisable (in dollars per share) $ 24.510 $ 25.530   $ 24.510
Remaining Life        
Outstanding 6 years 1 month 2 days 5 years 7 months 9 days 5 years 10 months 20 days  
Granted 9 years 9 years    
Exercisable 4 years 3 months 18 days 3 years 8 months 8 days