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Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2011
Restricted Stock Activity in Stock Incentive Plans
Restricted stock activity in our stock incentive plans for the six months ended June 30, 2011 is summarized as follows:

   
Number of
Shares
    
Weighted Average
Grant Date Fair Value
  
Nonvested at January 1, 2011
     1,852,550       $ 15.96    
Granted
     615,650         14.29    
Vested
     (36,585 )       (24.92 )  
Forfeited
     (4,806 )       (13.65 )  
Nonvested at June 30, 2011
     2,426,809         15.41