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INVENTORY VALUATION (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials $ 104,713 $ 76,811
Work-in-process 62,901 40,556
Finished goods 222,108 138,039
Inventory, Net 389,722 255,406
Excess of current cost over LIFO cost $ 67,185 $ 61,329