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INVENTORIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Inventories accounted for by using the LIFO method (as a percent)   19.00%
Inventories, by component    
Raw materials $ 93,679 $ 108,618
Work in process 96,316 94,414
Finished goods 120,849 115,809
Total 310,844 318,841
Less LIFO Reserve   (7,769)
Total 310,844 $ 311,072
Pro Forma    
Inventories, by component    
Less LIFO Reserve $ (6,105)