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INVENTORIES - Summary of inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
INVENTORIES    
Raw materials and supplies $ 17,425 $ 17,205
Work in process 6,071 6,597
Finished goods 4,091 4,357
Total inventories $ 27,587 $ 28,159