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INVENTORIES - Schedule of Net Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory, Net [Abstract]    
Finished goods $ 185,203 $ 190,100
Work in process 59,924 58,637
Raw materials 45,347 47,595
Inventories, net $ 290,474 $ 296,332