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Share Capital (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | For the Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Class A Stock outstanding, beginning of period | 13,141,103 |  |  | 13,182,332 |  |  | 13,139,203 |  |  | 13,261,095 |
Issued pursuant to shared-based compensation plans | 15,250 |  |  | — |  |  | 17,150 |  |  | 179,020 |
Repurchased and canceled pursuant to the stock buy-back | — |  |  | (49,557 | ) |  | — |  |  | (307,340 | )
Class A Stock outstanding, end of period | 13,156,353 |  |  | 13,132,775 |  |  | 13,156,353 |  |  | 13,132,775 |

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