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Share Capital (Tables) | 6 Months Ended
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Jun. 30, 2015
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,
| 2015 |  | 2014 |  | 2015 |  | 2014
Class A Stock outstanding, beginning of period | 13,634,831 |  |  | 13,516,626 |  |  | 13,530,688 |  |  | 13,377,967 |
Issued pursuant to shared-based compensation plans | 15,318 |  |  | 2,500 |  |  | 119,461 |  |  | 141,159 |
Class A Stock outstanding, end of period | 13,650,149 |  |  | 13,519,126 |  |  | 13,650,149 |  |  | 13,519,126 |

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