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Stock-Based Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2011
Stock-Based Compensation Plans 
Restricted Shares Granted
                   
Date of Grant
 
Shares
   
Market Value Per Share
 
Vesting Period
               
January 4, 2011
    475,804     $ 12.14  
20% per year over five years
January 4, 2011
    4,427       12.14  
100% on January 1, 2013
April 1, 2011
    2,907       17.20  
100% on January 1, 2013
May 11, 2011
    21,608       16.14  
20% per year over five years
July 1, 2011
    2,095       16.56  
100% on January 1, 2013