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Share Capital (Tables) | 6 Months Ended
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Jun. 30, 2017
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,
| 2017 |  | 2016 |  | 2017 |  | 2016
Class A Stock outstanding, beginning of period | 13,182,332 |  |  | 13,263,532 |  |  | 13,261,095 |  |  | 13,238,486 |
Issued pursuant to shared-based compensation plans | — |  |  | 7,163 |  |  | 179,020 |  |  | 272,483 |
Repurchased and canceled pursuant to the stock buy-back | (49,557 | ) |  | (10,980 | ) |  | (307,340 | ) |  | (251,254 | )
Class A Stock outstanding, end of period | 13,132,775 |  |  | 13,259,715 |  |  | 13,132,775 |  |  | 13,259,715 |

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