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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories valued at LIFO
(last-in,
first-out),
consist of the following (in thousands):
                 
 
March 31,
2020
 
 
December 31,
2019
 
Finished goods
  $
43,458
    $
42,281
 
Raw materials
   
33,050
     
31,686
 
                 
Total FIFO
(first-in,
first-out)
inventories
   
76,508
     
73,967
 
Reserve to adjust inventories to LIFO value
   
(19,062
)    
(19,062
)
                 
Total LIFO inventories
  $
57,446
    $
54,905