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INVENTORIES - Summary of inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 6,901 $ 6,806
Work in process 4,188 4,024
Finished goods 4,567 4,344
Spare parts and supplies 926 956
Inventories, gross 16,582 16,130
Allowance for obsolete inventory (994) (748)
Inventories, net $ 15,588 $ 15,382