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Stock Options (Schedule of Qualified Stock Option Activity) (Details) - Qualified Stock Options - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding at beginning of year (in shares) 254,195 301,800 292,350
Granted (in shares) 21,000 29,500 48,250
Exercised (in shares) (43,775) (75,355) (27,700)
Canceled (in shares) (10,600) (1,750) (11,100)
Options outstanding at end of year (in shares) 220,820 254,195 301,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding at beginning of year, Exercise Price (in dollars per share) [1] $ 34.64 $ 30.73 $ 26.68
Granted, Exercise Price (in dollars per share) [1] 54.87 53.95 52.67
Exercised, Exercise Price (in dollars per share) [1] 26.59 26.11 24.33
Canceled, Exercise Price (in dollars per share) [1] 50.68 53.61 35.42
Outstanding at end of year, Exercise Price (in dollars per share) [1] $ 37.39 $ 34.64 $ 30.73
Options exercisable at end of year (in shares) 136,220 143,345 172,450
Exercisable at end of year, Exercise Price (in dollars per share) [1] $ 29.66 $ 25.69 $ 22.30
Options available for grant at end of year (in shares) 353,450 370,750 28,950
[1] Weighted Averages