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SHARE-BASED COMPENSATION - RSUs to Employees (Details) - RSUs - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SHARE-BASED COMPENSATION      
Shares granted to employees 868,036 574,488 283,862
Total compensation cost at the date of grant $ 12,100 $ 13,200 $ 7,300
Total recognized compensation cost 7,713 $ 5,611 $ 3,767
Total unrecognized share-based compensation costs $ 20,383    
Weighted-average period of recognition of compensation expense 2 years 5 months 9 days    
Number of Shares      
Unvested at the beginning of the period (in shares) 1,311,410    
Granted (in shares) 868,036 574,488 283,862
Vested (in shares) (650,172)    
Forfeited (in shares) (126,415)    
Unvested at the end of the period (in shares) 1,402,859 1,311,410  
Weighted Average Grant-Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 15.75    
Granted (in dollars per share) 15.26    
Vested (in dollars per share) 11.16    
Forfeited (in dollars per share) 19.34    
Unvested at the end of the period (in dollars per share) $ 17.27 $ 15.75  
Total fair value of shares vested $ 7,271 $ 4,641 $ 2,965
Minimum      
SHARE-BASED COMPENSATION      
Vesting period 1 year    
Maximum      
SHARE-BASED COMPENSATION      
Vesting period 4 years