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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Common Stock and Treasury Stock Activity The number of shares of common stock and treasury stock and the share activity for 2018 and 2017 were as follows:
 
   
 
 
Common Shares
 
 
Treasury Shares
 
     
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
Balance at the beginning of the year
 
 
151,906,797
 
 
 
153,412,050
 
 
 
27,879,929
 
 
 
24,305,930
 
Stock plan shares issued
 
 
822,878
 
 
 
2,068,746
 
 
 
—
 
 
 
—
 
Shares surrendered by optionees
 
 
(230,550
) 
 
 
(180,537
) 
 
 
230,550
 
 
 
180,537
 
Common stock repurchases
 
 
(12,000,144
) 
 
 
(3,393,462
) 
 
 
12,000,144
 
 
 
3,393,462
 
Balance at the end of the year
 
 
140,498,981
 
 
 
151,906,797
 
 
 
40,110,623
 
 
 
27,879,929