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INVENTORY (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Inventory [Line Items]      
Raw materials $ 76,811 $ 87,919  
Work-in-process 40,556 39,555  
Finished goods 138,039 148,456  
Inventory, Net $ 255,406 $ 275,930  
Percentage of total inventories valued using the LIFO method (as a percent) 40.00% 40.00% 40.00%
Excess of current cost over LIFO cost $ 61,329 $ 59,765