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INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
INTANGIBLE ASSETS, NET      
Gross Carrying Amount $ 42,628 $ 39,633  
Accumulated Amortization (20,199) (16,842)  
Total intangible assets, net 22,429 22,791  
Amortization expense 5,122 5,310 $ 4,666
Expected amortization expense of intangible assets      
2021 4,443    
2022 3,662    
2023 3,035    
2024 2,503    
2025 2,034    
2025 and thereafter 6,752    
Technical know-how      
INTANGIBLE ASSETS, NET      
Gross Carrying Amount 1,543 1,428  
Accumulated Amortization (1,525) (1,425)  
Total intangible assets, net 18 3  
Computer software      
INTANGIBLE ASSETS, NET      
Gross Carrying Amount 41,085 38,205  
Accumulated Amortization (18,674) (15,417)  
Total intangible assets, net $ 22,411 $ 22,788