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Share Capital (Tables)
6 Months Ended
Jun. 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
June 30,
For the Six Months Ended
June 30,
2021202020212020
Class A Stock outstanding, beginning of period12,586,043 12,610,740 12,381,778 12,698,703 
Issued pursuant to share-based compensation plans6,603 25,783 210,868 347,324 
Repurchased and canceled pursuant to the stock buy-back— (191,044)— (600,548)
Class A Stock outstanding, end of period12,592,646 12,445,479 12,592,646 12,445,479