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Stockholder's Equity (Summary Of Stock Option Plan Activity) (Details) - $ / shares
 12 Months Ended 105 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Options Outstanding        
Granted (in shares)       6,413,660
Outstanding as of End of Period (in shares) 3,757,947     3,757,947
Exercisable (in shares) 1,200,250     1,200,250
Stock Option Plan [Member]        
Options Outstanding        
Outstanding as of Beginning of Period (in shares) 4,530,982 4,712,330    
Granted (in shares) 845,440 893,220    
Exercised (in shares) (1,180,242) (813,838)    
Cancelled/Forfeited (in shares) (438,233) (260,730)    
Outstanding as of End of Period (in shares) 3,757,947 4,530,982 4,712,330 3,757,947
Exercisable (in shares) 1,200,250 1,792,242   1,200,250
Exercise Price        
Outstanding as of Beginning of Period (in dollars per share) $ 41.49 $ 38.52    
Granted (in dollars per share) 46.00 42.00    
Exercised (in dollars per share) 24.80 23.47    
Cancelled/Forfeited (in dollars per share) 49.49 45.84    
Outstanding as of End of Period (in dollars per share) 46.81 41.49 $ 38.52 $ 46.81
Exercisable (in dollars per share) $ 45.93 $ 31.00   $ 45.93
Remaining Life        
Outstanding 5 years 10 months 6 days 4 years 10 months 20 days 4 years 7 months 2 days  
Granted 8 years 4 months 27 days 8 years 4 months 27 days    
Exercisable 3 years 8 months 27 days 2 years 1 month 24 days