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INVENTORY VALUATION (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory [Line Items]    
Percentage of LIFO Inventory 36.00% 37.00%
Raw materials $ 107,278 $ 103,820
Work-in-process 69,671 53,950
Finished goods 234,171 204,059
Inventory, Net 411,120 361,829
Excess of current cost over LIFO cost $ 77,112 $ 79,626