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INVENTORIES - Summary (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory Disclosure    
Raw materials and supplies $ 19,185 $ 15,892
Work in process 5,616 5,691
Finished goods 4,225 3,324
Total inventories $ 29,026 $ 24,907