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Share Capital (Tables)
 9 Months Ended
Sep. 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 September 30,
 
For the Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Class A Stock outstanding, beginning of period
13,132,775

 
13,259,715

 
13,261,095

 
13,238,486

Issued pursuant to shared-based compensation plans
19,883

 
10,988

 
198,903

 
283,471

Repurchased and canceled pursuant to the stock buy-back
(143,010
)
 
(2,264
)
 
(450,350
)
 
(253,518
)
Class A Stock outstanding, end of period
13,009,648

 
13,268,439

 
13,009,648

 
13,268,439