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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Carrying Amount [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 145,352 $ 145,862
Estimated Fair Value [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 164,083 $ 157,710