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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
4.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 

 

In 2018 and 2017, inventory quantities were reduced. These reductions resulted in liquidations 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 2018 and 2017 costs of products sold by approximately $0.6 million and $0.4 million, respectively.