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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2017
Common Stock and Treasury Stock Activity

The number of shares of common stock and treasury stock and the share activity for 2017 and 2016 were as follows:

 

     
     Common Shares      Treasury Shares  
         
      2017      2016      2017      2016  

Balance at the beginning of the year

     153,412,050        159,906,032        24,305,930        15,293,877  

Stock plan shares issued

     2,068,746        2,518,071                

Shares surrendered by optionees

     (180,537      (204,538      180,537        204,538  

Common stock repurchases

     (3,393,462      (8,807,515      3,393,462        8,807,515  

Balance at the end of the year

     151,906,797        153,412,050        27,879,929        24,305,930