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INVENTORY VALUATION (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Percentage of LIFO Inventory 33.00% 32.00%
Raw materials $ 115,278 $ 97,577
Work-in-process 55,309 50,695
Finished goods 210,943 200,395
Inventory, Net 381,530 348,667
Excess of current cost over LIFO cost $ 69,553 $ 68,641