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Share Capital (Tables)
9 Months Ended
Sep. 30, 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 periods indicated:
For the Three Months Ended
September 30,
For the Nine Months Ended
September 30,
2021202020212020
Class A Stock outstanding, beginning of period12,592,646 12,445,479 12,381,778 12,698,703 
Issued pursuant to share-based compensation plans31,582 43,238 242,450 390,562 
Repurchased and canceled pursuant to the stock buy-back(108,494)(84,290)(108,494)(684,838)
Class A Stock outstanding, end of period12,515,734 12,404,427 12,515,734 12,404,427