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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
INVENTORIES [Abstract]    
Raw Materials and Supplies $ 129,294 $ 122,945
Work in Process 43,202 47,098
Finished Goods 101,789 98,778
Inventory, Net $ 274,285 $ 268,821