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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2013
EARNINGS PER SHARE  
Schedule of reconciliation of basic and diluted earnings per share

  Income
(Numerator)
   Shares
(Denominator)
   Per Share
Amount
  

For the Year Ended December 31, 2013

                  

Basic EPS

                  

Income available to common stockholders

   $ 171,994   66,090   $ 2.60  

Effect of Dilutive Securities

                  

Stock options

         2,106        

Restricted stock

     —   12        
             

Diluted EPS

                  

Income available to common stockholders

   $ 171,994   68,208   $ 2.52  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​

For the Year Ended December 31, 2012

                  

Basic EPS

                  

Income available to common stockholders

   $ 162,612   66,392   $ 2.45  

Effect of Dilutive Securities

                  

Stock options

         1,990        

Restricted stock

     —   13        
             

Diluted EPS

                  

Income available to common stockholders

   $ 162,612   68,395   $ 2.38  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​

For the Year Ended December 31, 2011

                  

Basic EPS

                  

Income available to common stockholders

   $ 183,683   66,553   $ 2.76  

Effect of Dilutive Securities

                  

Stock options

         2,714        

Restricted stock

     —   7        
             

Diluted EPS

                  

Income available to common stockholders

   $ 183,683   69,274   $ 2.65  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​