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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories at LIFO value consist of the following as of December 31 (in thousands):
 
    
2020
    
2019
 
Finished goods
   $ 39,048      $ 42,281  
Raw materials
     44,475        31,686  
    
 
 
    
 
 
 
Total FIFO inventories
     83,523        73,967  
Reserve to adjust inventories to LIFO value
     (16,821      (19,062
    
 
 
    
 
 
 
Total LIFO inventories
   $ 66,702      $ 54,905