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Inventories | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | Inventories
|  | December 31,
(in thousands) |  | 2020 |  | 2019
Finished goods and work-in-process |  | $ | 325,588 |  |  | $ | 295,997 |
Raw materials |  | 59,413 |  |  | 55,702 |
Stores, supplies, and other |  | 16,030 |  |  | 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.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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