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Inventories (Tables)
12 Months Ended
Dec. 31, 2013
Inventories [Abstract]  
Schedule of Inventories

Inventories consist of the following:

 

December 31,   2013     2012  
             
Finished goods   $ 6,552     $ 3,615  
Materials and products in process     55,225       50,483  
      61,777       54,098  
Adjustment of inventories to a LIFO basis     (38,516 )     (38,089 )
    $ 23,261     $ 16,009