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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory at FIFO    
Finished products   $ 3,318
Materials and work in process   45,686
Gross inventories    49,004 [1]
Less LIFO reserve    (37,476) [1]
Less excess and obsolescence reserve    (1,311) [1]
Net inventories    $ 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.