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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Derivative Financial Instruments (Details) - Interest rate swap agreement - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jun. 12, 2017
Derivative instruments        
Losses resulted from changes in fair values of the interest rate swap agreement $ 15 $ 46    
Line of credit        
Derivative instruments        
Interest rate swap agreement       $ 8,000
Level 2        
Derivative instruments        
Fair values of interest rate swap agreement     $ 3  
Prepaid Expenses and Other Current Assets        
Derivative instruments        
Fair values of interest rate swap agreement     $ 3