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Stock Repurchases (Tables)
6 Months Ended
Jun. 30, 2012
Shares of Common Stock Repurchased

The following table sets forth information regarding the shares of our common stock that we repurchased in the periods indicated:

 

     Three Months Ended
June 30,
     Six Months Ended
June 30,
 
     2012      2011      2012      2011  

Number of shares

     928,500         1,100,000         3,025,700         3,100,000   

Total cost

   $ 61,261       $ 79,423       $ 207,918       $ 218,520   

Average cost per share

   $ 65.98       $ 72.20       $ 68.72       $ 70.49