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INVENTORIES (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 49,437 $ 52,997
Work-in-process 12,474 10,774
Finished goods 113,418 97,028
Inventories, net $ 175,329 $ 160,799