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Inventories | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at December 31, 2020 and 2019 (in thousands):
| December 31,
| 2020 |  | 2019
Finished goods | $ | 454,162 |  |  | $ | 495,639 |
Raw materials and work in process(a) | 219,896 |  |  | 205,781 |
Stores, supplies and other | 76,179 |  |  | 67,564 |
Total | $ | 750,237 |  |  | $ | 768,984 |
(a)Included $129.6 million and $109.3 million at December 31, 2020 and 2019, respectively, of work in process in our Lithium segment. Approximately 8% and 10% of our inventories are valued using the last-in, first-out (“LIFO”) method at December 31, 2020 and 2019, respectively. The portion of our domestic inventories stated on the LIFO basis amounted to $62.2 million and $78.7 million at December 31, 2020 and 2019, respectively, which are below replacement cost by approximately $29.7 million and $30.8 million, respectively.

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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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