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Share Capital (Tables) | 9 Months Ended
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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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Class A Stock outstanding, beginning of period | 12,592,646 |  |  | 12,445,479 |  |  | 12,381,778 |  |  | 12,698,703 |
Issued pursuant to share-based compensation plans | 31,582 |  |  | 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 period | 12,515,734 |  |  | 12,404,427 |  |  | 12,515,734 |  |  | 12,404,427 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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