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Share Capital (Tables)
 9 Months Ended
Sep. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Class A Stock outstanding, beginning of period
13,259,715

 
13,650,149

 
13,238,486

 
13,530,688

Issued pursuant to shared-based compensation plans
10,988

 
12,063

 
283,471

 
131,524

Repurchased and canceled pursuant to the stock buy-back
(2,264
)
 
(328,844
)
 
(253,518
)
 
(328,844
)
Class A Stock outstanding, end of period
13,268,439

 
13,333,368

 
13,268,439

 
13,333,368