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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Carrying Amount [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 106,931 $ 103,647
Estimated Fair Value [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 110,524 $ 111,864