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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Carrying Amount [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 116,816 $ 117,587
Estimated Fair Value [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 125,673 $ 116,818