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EQUITY-METHOD INVESTMENT (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
vote
Mar. 31, 2018
USD ($)
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%    
Loss relating to joint venture's expenses $ 101 $ 139  
Carrying value of joint venture $ 4,801   $ 4,902
St. Gabriel CC Company, LLC | Eastman Chemical Company      
Equity Method Investment, Summarized Financial Information [Abstract]      
Ownership percentage in joint venture 33.34%    
Number of votes | vote 2