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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
INVENTORIES    
Inventories accounted for by using the LIFO method (as a percent) 19.00% 19.00%
Inventories, by component    
Raw materials $ 113,673 $ 125,889
Work in process 109,062 75,261
Finished goods 134,575 127,393
Total 357,310 328,543
Less LIFO reserve (7,620) (6,658)
Total $ 349,690 $ 321,885