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Capital Stock Transactions
3 Months Ended
Mar. 31, 2012
Capital Stock Transactions [Abstract]  
Capital Stock Transactions
14.  Capital Stock Transactions
We repurchased the following capital stock for the three months ended March 31, 2012 and 2011:
 
   
Three months ended
March 31,
 
   
2012
   
2011
 
             
Shares repurchased
    -       341,513  
Weighted average price per share
  $ -     $ 63.79