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INVENTORIES - Summary of inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
INVENTORIES    
Raw materials and supplies $ 15,952 $ 17,205
Work in process 6,711 6,597
Finished goods 3,854 4,357
Total inventories $ 26,517 $ 28,159