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INVENTORY VALUATION (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials $ 83,480 $ 76,811
Work-in-process 54,319 40,556
Finished goods 151,836 138,039
Inventory, Net 289,635 255,406
Excess of current cost over LIFO cost $ 64,988 $ 61,329