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INVENTORY VALUATION (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Percentage of LIFO Inventory 38.00% 37.00%
Raw materials $ 100,283 $ 103,820
Work-in-process 59,108 53,950
Finished goods 216,346 204,059
Inventory, Net 375,737 361,829
Excess of current cost over LIFO cost $ 79,647 $ 79,626