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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories

 

December 31,  2016   2015 
         
Finished goods  $24,099   $16,637 
Materials and products in process   72,978    62,523 
    97,077    79,160 
Adjustment of inventories to a LIFO basis   (42,542)   (42,061)
   $54,535   $37,099