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EQUITY-METHOD INVESTMENT (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
vote
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Equity Method Investment, Summarized Financial Information [Abstract]          
Percentage of production offtake     66.66%    
Percentage of operating expenses to be absorbed     66.66%    
St. Gabriel CC Company, LLC          
Equity Method Investment, Summarized Financial Information [Abstract]          
Ownership percentage in joint venture 66.66%   66.66%    
Loss relating to joint venture's expenses $ 81 $ 141 $ 182 $ 280  
Carrying value of joint venture $ 4,720   $ 4,720   $ 4,902
St. Gabriel CC Company, LLC | Eastman Chemical Company          
Equity Method Investment, Summarized Financial Information [Abstract]          
Ownership percentage in joint venture 33.34%   33.34%    
Number of votes | vote     2