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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) - Interest rate swap agreement - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Jun. 12, 2017
Derivative instruments    
Losses (gains) resulted from changes in fair values of the interest rate swap agreement $ 15  
Line of credit    
Derivative instruments    
Interest rate swap agreement   $ 8,000