Share capital (Tables)

12 Months Ended

Dec. 31, 2021

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:

	2021	2020
Class A Stock outstanding, beginning of year	12,381,778	12,698,703
Issued pursuant to share-based compensation plans (note 16)	242,450	401,597
Repurchased and canceled pursuant to the stock buy-back	(177,192)	(718,522)
Class A Stock outstanding, end of year	12,447,036	12,381,778