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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2013
EARNINGS PER SHARE  
EARNINGS PER SHARE

12. EARNINGS PER SHARE

        Basic earnings per share and diluted earnings per share have been calculated for the years ended December 31, 2011, 2012 and 2013 as follows:

 
   2011   2012   2013  
 
   RMB   RMB   RMB  
 
   (in thousands, except share and
per share data)
  

Numerator:

                    

Net income

     386,508     470,106     500,640  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Denominator:

                    

Denominator for basic earnings per share—weighted average common shares outstanding

     56,754,240     57,510,591     58,551,925  

Effect of dilutive share options

     2,313,184     1,864,532     1,517,272  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Denominator for diluted earnings per share

     59,067,424     59,375,123     60,069,197  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Basic earnings per share

     6.81     8.17     8.55  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Diluted earnings per share

     6.54     7.92     8.33  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

        The Company excluded outstanding share options of 1,294,660 in 2011, 2,520,002 in 2012 and 2,707,713 in 2013 from the calculation of diluted earnings per common share because the exercise prices of these share options were greater than or equal to the average market value of the common shares. These options could be included in the calculation in the future if the average market value of the common shares increases and is greater than the exercise price of these options.