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Share Capital (Tables) | 9 Months Ended
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Sep. 30, 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 periods indicated:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Class A Stock outstanding, beginning of period | 13,156,353 |  |  | 13,132,775 |  |  | 13,139,203 |  |  | 13,261,095 |
Issued pursuant to share-based compensation plans | 21,578 |  |  | 19,883 |  |  | 38,728 |  |  | 198,903 |
Repurchased and canceled pursuant to the stock buy-back | — |  |  | (143,010 | ) |  | — |  |  | (450,350 | )
Class A Stock outstanding, end of period | 13,177,931 |  |  | 13,009,648 |  |  | 13,177,931 |  |  | 13,009,648 |

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