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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 105,448 $ 110,182
Work in process 28,613 17,344
Obsolescence reserve (12,307) (12,696)
Inventories $ 121,754 $ 114,830