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Inventories
12 Months Ended
Dec. 31, 2014
Inventories [Abstract]  
Inventories
  3. Inventories

 

Inventories consist of the following:

 

December 31,   2014     2013  
             
Finished goods   $ 20,083     $ 6,552  
Materials and products in process     65,184       55,225  
      85,267       61,777  
Adjustment of inventories to a LIFO basis     (40,578 )     (38,516 )
    $ 44,689     $ 23,261