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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw material $ 91,507 $ 83,541
Work-in-process 42,326 40,525
Finished goods 234,602 215,770
Inventory, Gross $ 368,435 $ 339,836