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INVENTORIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw material $ 99,198 $ 83,541
Work-in-process 45,069 40,525
Finished goods 228,465 215,770
Inventory, Gross $ 372,732 $ 339,836