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Share Capital (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Changes in Number of Shares of Class A Stock Outstanding
The following table reflects changes in the number of shares of Class A Stock outstanding for the years indicated:
 
2018
 
2017
Class A Stock outstanding, beginning of year
13,139,203

 
13,261,095

Issued pursuant to share-based compensation plans (note 15)
38,728

 
328,458

Repurchased and canceled pursuant to the stock buy-back
(236,122
)
 
(450,350
)
Class A Stock outstanding, end of year
12,941,809

 
13,139,203