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INVENTORIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw material $ 103,185 $ 110,806
Work-in-process 54,524 55,543
Finished goods 227,659 229,386
Inventory, Gross $ 385,368 $ 395,735