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STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Stock-based compensation              
Stock-based compensation (expense) benefit   $ 341 $ 1,252 $ 946 $ (255)    
2015 Management Incentive Plan              
Stock-based compensation              
Voting power of specified employees in the company or the surviving entity after reorganization to be eligible for cash bonuses (as a percent) 50.00%            
Transfer of voting power of the company required to be eligible for cash bonuses (as a percent) 50.00%            
Sale of assets in the Russian operations to be eligible for cash bonuses (as a percent) 50.00%            
Total bonus pool $ 10,000            
Restricted stock units | 2013 Sub-tranche              
Stock-based compensation              
Stock-based compensation (expense) benefit   300   900      
Shares granted during the period with approved performance criteria             637,800
Weighted average per unit grant date fair value (in dollars per share)             $ 10.53
Restricted stock units | 2014 Sub-tranche              
Stock-based compensation              
Shares granted during the period with approved performance criteria           783,584  
Weighted average per unit grant date fair value (in dollars per share)           $ 8.36  
Restricted stock units | 2014 Equity Incentive Plan              
Stock-based compensation              
Compensation cost related to unvested granted awards not yet recognized   $ 1,100   $ 1,100      
Weighted average period of recognition of unrecognized compensation cost related to nonvested awards       2 years 1 month 6 days