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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory at FIFO    
Finished products $ 2,458 $ 3,318
Materials and work in process 45,338 45,686
Gross inventories 47,796 49,004 [1]
Less: LIFO reserve (37,384) (37,476) [1]
Less: excess and obsolescence reserve (1,202) (1,311) [1]
Net inventories $ 9,210 $ 10,217 [1]
[1] Note: The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.