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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consist of the following:

 

December 31,  2017   2016 
         
Finished goods  $22,558   $24,099 
Materials and products in process   62,336    72,978 
    84,894    97,077 
Adjustment of inventories to a LIFO basis   (45,180)   (42,542)
   $39,714   $54,535