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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Carrying Amount [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 144,393 $ 144,090
Estimated Fair Value [Member]    
Long-term Financial Liabilities [Abstract]    
Long-term debt $ 164,242 $ 171,374