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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories valued at LIFO
(last-in,
first-out),
consist of the following (in thousands):
 
    
June 30,

2021
    
December 31,

2020
 
Finished goods
   $ 48,060      $ 39,048  
Raw materials
     44,410        44,475  
    
 
 
    
 
 
 
Total FIFO
(first-in,
first-out)
inventories
     92,470        83,523  
Reserve to adjust inventories to LIFO value
     (16,821      (16,821
    
 
 
    
 
 
 
Total LIFO inventories
   $ 75,649      $ 66,702