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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Carrying Amount [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 103,647 $ 104,936
Estimated Fair Value [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 111,864 $ 120,243