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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
INVENTORIES    
Inventories accounted for by using the LIFO method (as a percent) 18.00% 19.00%
Inventories, by component    
Raw materials $ 118,037 $ 125,889
Work in process 89,188 75,261
Finished goods 126,186 127,393
Total 333,411 328,543
Less LIFO reserve (7,163) (6,658)
Total $ 326,248 $ 321,885