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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2013
SHARE-BASED COMPENSATION  
Summary of share option activity

 

 
   Number
of shares		   Weighted
average
exercise
price		   Weighted
average
remaining
contractual
life (years)		   Aggregate
intrinsic value
(thousands)		  

Outstanding at January 1, 2013

     5,267,540   US$ 18.01              

Granted

     1,364,064   US$ 30.14              

Exercised

     1,357,376   US$ 11.88              

Forfeited

     32,804   US$ 23.79              
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     5,241,424   US$ 22.71     3.70   US$ 85,100  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Vested and expected to vest at December 31, 2013

     4,993,818   US$ 22.49     3.65   US$ 82,191  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Exercisable at December 31, 2013

     2,513,568   US$ 17.66     2.71   US$ 53,515  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of non-vested share option activity

 

 
   Number
of shares		   Weighted
average
grant-date
fair value		  

Non-vested at January 1, 2013

     2,668,000   US$ 9.17  
           
​ ​ ​ ​ ​ ​ ​ ​

Granted

     1,364,064   US$ 11.61  

Vested

     1,271,404   US$ 8.41  

Forfeited

     32,804   US$ 9.60  
           
​ ​ ​ ​ ​ ​ ​ ​

Non-vested at December 31, 2013

     2,727,856   US$ 10.74  
           
​ ​ ​ ​ ​ ​ ​ ​

Expected to vest at December 31, 2013

     2,480,250   US$ 10.74  
           
​ ​ ​ ​ ​ ​ ​ ​