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EQUITY-METHOD INVESTMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Number of votes 2    
Percentage of production offtake 66.66%    
Percentage of operating expenses to be absorbed 66.66%    
St. Gabriel CC Company, LLC      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage in joint venture 66.66%    
Loss relating to joint venture's expenses $ 569 $ 546 $ 293
Carrying value of joint venture $ 4,902 $ 4,804  
St. Gabriel CC Company, LLC | Eastman Chemical Company      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage in joint venture 33.34%