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SHARE-BASED COMPENSATION (Details 2) - RSUs - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Options      
Shares granted to employees 574,488 283,862 1,361,623
Total compensation cost at the date of grant $ 13,200 $ 7,300 $ 4,900
Total unrecognized share-based compensation costs 17,178    
Total recognized compensation cost $ 5,611 $ 3,767 $ 2,321
Weighted-average period of recognition of compensation expense 1 year 10 months 13 days    
Number of Shares      
Unvested at the beginning of the period (in shares) 1,610,219    
Granted (in shares) 574,488 283,862 1,361,623
Vested (in shares) (636,000)    
Forfeited (in shares) (237,297)    
Unvested at the end of the period (in shares) 1,311,410 1,610,219  
Weighted Average Grant-Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 7.76    
Granted (in dollars per share) 27.34    
Vested (in dollars per share) 7.27    
Forfeited (in dollars per share) 14.39    
Unvested at the end of the period (in dollars per share) $ 15.75 $ 7.76  
Total fair value of shares vested $ 4,641 $ 2,965 $ 1,944
Minimum      
Share Options      
Vesting period 1 year    
Maximum      
Share Options      
Vesting period 4 years