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Share Capital
9 Months Ended
Sep. 30, 2011
Share Capital [Abstract] 
Share capital
8. Share capital
The following table reflects changes in the number of shares of Class A Stock outstanding for the periods indicated:
                                 
    Three months ended     Nine months ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Class A Stock outstanding, beginning of period
    13,568,945       13,253,022       13,268,522       13,118,001  
Issued pursuant to the share-based compensation plans
    2,000       6,500       302,423       141,521  
 
                       
Class A Stock outstanding, end of period
    13,570,945       13,259,522       13,570,945       13,259,522