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INVENTORY VALUATION (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Percentage of LIFO Inventory 37.00% 32.00%
Raw materials $ 106,464 $ 97,577
Work-in-process 52,827 50,695
Finished goods 206,343 200,395
Inventory, Net 365,634 348,667
Excess of current cost over LIFO cost $ 74,814 $ 68,641