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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories

3.       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 

 

In 2017, inventory quantities were reduced. This reduction resulted in a liquidation of LIFO inventory quantities carried at lower costs prevailing in prior years as compared with the current cost of purchases, the effect of which decreased 2017 costs of products sold by approximately $0.4 million.