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INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
INVENTORIES      
Raw materials $ 75,722 $ 47,759  
Work-in-process 74,105 46,817  
Finished goods 404,243 167,446  
Inventories 554,070 262,022  
Inventory written down $ 19,447 $ 14,646 $ 17,820