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Inventories
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Inventories
  3. Inventories

 

Inventories consist of the following:

 

December 31,   2012     2011  
             
Finished goods   $ 3,615     $ 4,071  
Materials and products in process     50,483       43,622  
      54,098       47,693  
Adjustment of inventories to a LIFO basis     (38,089 )     (37,476 )
    $ 16,009     $ 10,217