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BORROWINGS (Short-Term Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
BORROWINGS      
Short-term bank borrowings $ 15,317 $ 79,063  
Interest rate on short-term bank borrowings 5.20% 5.30% 5.00%