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INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 72,144 $ 48,220
Work in process 92,047 92,764
Finished goods 6,587 2,331
Inventory, net, total 170,778 143,315
Aggregate inventory write-downs $ 1,206 $ 1,352