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INVENTORY VALUATION (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory [Line Items]    
Percentage of LIFO Inventory 37.00% 36.00%
Raw materials $ 110,641 $ 116,716
Work-in-process 63,077 63,744
Finished goods 224,530 213,288
Inventory, Net 398,248 393,748
Excess of current cost over LIFO cost $ 75,504 $ 75,292