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Share Capital (Tables) | 9 Months Ended
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Sep. 30, 2014
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:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Class A Stock outstanding, beginning of period | 13,519,126 |  |  | 13,496,783 |  |  | 13,377,967 |  |  | 13,508,318 |
Issued pursuant to shared-based compensation plans | 11,562 |  |  | 65,227 |  |  | 152,721 |  |  | 65,227 |
Repurchased and canceled pursuant to the stock buy-back | — |  |  | (119,251 | ) |  | — |  |  | (130,786 | )
Class A Stock outstanding, end of period | 13,530,688 |  |  | 13,442,759 |  |  | 13,530,688 |  |  | 13,442,759 |

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