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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
INVENTORIES    
Inventories accounted for by using the LIFO method (as a percent) 19.00% 20.00%
Inventories, by component    
Raw materials $ 115,575 $ 114,501
Work in process 103,262 108,924
Finished goods 130,055 137,591
Total 348,892 361,016
Less LIFO reserve (7,940) (7,857)
Total $ 340,952 $ 353,159