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Inventories
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
 December 31,
(in thousands)
20202019
Finished goods and work-in-process$325,588 $295,997 
Raw materials59,413 55,702 
Stores, supplies, and other16,030 14,239 
$401,031 $365,938 
Our U.S. petroleum additives finished goods, work-in-process, and raw materials inventories, which are stated on the LIFO basis, amounted to $124 million at December 31, 2020 and were below replacement cost by approximately $37 million. At December 31, 2019, LIFO basis inventories were $116 million, which was approximately $50 million below replacement cost.
Our foreign inventories amounted to $255 million at December 31, 2020 and $238 million at December 31, 2019.
Reserves for obsolete and slow-moving inventory included in the table above were not material at December 31, 2020 or December 31, 2019.