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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2012
Stock-Based Compensation [Abstract]  
Summary of the changes in outstanding stock options

A summary of the changes in outstanding stock options is as follows:

 

                                 
    Three Months Ended March 31,  
    2012     2011  
    Number of
Stock
Options		     Weighted
Average
Exercise Price		     Number of
Stock
Options		     Weighted
Average
Exercise Price		  

Outstanding at beginning of period

     28,825,986     $ 12.77       28,129,885     $ 12.68  

Exercised

     (624,058 )      5.51       —         —    

Forfeited

     (17,100 )      9.50       —         —    
   

 

 

            

 

 

          

Outstanding at end of period

     28,184,828     $ 12.93       28,129,885     $ 12.68