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INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 48,220 $ 26,296
Work in process 92,764 105,564
Finished goods 2,331 5,672
Inventory, net, total 143,315 137,532
Aggregate inventory write-downs $ 1,352 $ 1,391