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INVENTORIES - Schedule of Net Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Finished goods $ 178,263 $ 179,885
Work in process 52,640 47,715
Raw materials 56,059 52,747
Inventories, net $ 286,962 $ 280,347