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EQUITY-METHOD INVESTMENT (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Vote
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Equity method investment [Abstract]          
Percentage of production offtake     66.66%    
Percentage of operating expenses to be absorbed     66.66%    
St. Gabriel CC Company, LLC [Member]          
Equity method investment [Abstract]          
Ownership percentage in joint venture 66.66%   66.66%    
Number of votes | Vote     2    
Loss relating to joint venture's expenses | $ $ (141) $ (136) $ (280) $ (270)  
Carrying value of joint venture | $ $ 4,524   $ 4,524   $ 4,804
St. Gabriel CC Company, LLC [Member] | Eastman Chemical Company [Member]          
Equity method investment [Abstract]          
Ownership percentage in joint venture 33.34%   33.34%    
Number of votes | Vote     2