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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consist of the following:

 

December 31,  2018   2017 
         
Finished goods  $17,313   $22,558 
Materials and products in process   60,448    62,336 
    77,761    84,894 
Adjustment of inventories to a LIFO basis   (46,341)   (45,180)
   $31,420   $39,714