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SHARE-BASED COMPENSATION (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2010
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
item
$ / shares
SHARE-BASED COMPENSATION        
Maximum aggregate number of shares to be issued 2,330,000      
Annual percentage increase in authorized shares on the first day of each of 2007, 2008 and 2009 prior to the year of amendment for awards other than incentive option shares 1.00%      
Annual percentage increase in authorized shares on the first day of each calendar year from the year of amendment for awards other than incentive option shares 2.50%      
Expiry term of share options   10 years    
Number of shares to be granted after expiration   0    
Number of Options        
Granted (in shares)   0 0  
Options        
Share Options        
Total unrecognized compensation expense related to share-based compensation awards | $   $ 44    
Weighted-average period of recognition of compensation expense   5 months 1 day    
Recognized compensation expense | $   $ 355 $ 1,321 $ 2,186
Term for which the entity is listed       7 years
Assumptions used to estimate the fair value of stock options granted        
Risk free rate (as a percent)       2.47%
Volatility ratio (as a percent)       89.60%
Dividend yield (as a percent)   0.00%    
Annual exit rate (as a percent)       3.58%
Exercise multiple | item       4.10
Number of Options        
Options outstanding at the beginning of the period (in shares)   846,113    
Exercised (in shares)   (167,587)    
Forfeited (in shares)   (2,817)    
Options outstanding at the end of the period (in shares)   675,709 846,113  
Options vested or expected to be vested at the end of the period (in shares)   673,105    
Options exercisable at the end of the period (in shares)   664,459    
Weighted Average Exercise Price        
Options outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 12.21    
Exercised (in dollars per share) | $ / shares   11.14    
Forfeited (in dollars per share) | $ / shares   9.33    
Options outstanding at the end of the period (in dollars per share) | $ / shares   12.44 $ 12.21  
Options vested or expected to be vested at the end of the period (in dollars per share) | $ / shares   12.45    
Options exercisable at the end of the period (in dollars per share) | $ / shares   $ 12.50    
Weighted Average Remaining Contract Terms        
Options outstanding at the end of the period   3 years 5 years  
Options vested or expected to be vested at the end of the period   3 years    
Options exercisable at the end of the period   3 years    
Aggregate Intrinsic Value        
Options outstanding at the end of the period | $   $ 12,354 $ 11,794  
Options vested or expected to be vested at the end of the period | $   12,302    
Options exercisable at the end of the period | $   $ 12,129    
Weighted average grant-date fair value of options granted (in dollars per share) | $ / shares   $ 0.00 $ 0.00 $ 6.07
Total intrinsic value of options exercised | $   $ 3,422 $ 7,493 $ 20,439