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Stock Options (Schedule of Non-Qualified Stock Options Activity) (Details) - Non Qualified Options - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares            
Options outstanding at beginning of year (in shares) 40,200 67,000 112,400      
Granted (in shares) 0 0 0      
Exercised (in shares) (34,900) (26,800) (45,400)      
Canceled (in shares) 0 0 0      
Options outstanding at end of year (in shares) 5,300 40,200 67,000      
Exercise Price            
Outstanding at beginning of year, exercise price (in dollars per share) $ 42.99 $ 42.43 $ 34.48      
Granted, exercise price (in dollars per share) 0 0 0      
Exercised, exercise price (in dollars per share) 42.40 41.61 22.73      
Canceled, exercise price (in dollars per share) 0 0 0      
Outstanding at end of year, exercise price (in dollars per share) $ 42.99 $ 42.43 $ 34.48 $ 46.87 $ 42.99 $ 42.43
Options exercisable at end of year (in shares)       5,300 34,400 50,400
Exercisable at end of year, exercise price (in dollars per share)       $ 46.87 $ 41.21 $ 39.86