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Inventories | 3 Months Ended
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Mar. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at March 31, 2020 and December 31, 2019 (in thousands):
| March 31, |  | December 31,
| 2020 |  | 2019
Finished goods(a) | $ | 562,231 |  |  | $ | 495,639 |
Raw materials and work in process(b) | 221,173 |  |  | 205,781 |
Stores, supplies and other | 70,096 |  |  | 67,564 |
Total | $ | 853,500 |  |  | $ | 768,984 |
(a) | Increase primarily due to the build-up of inventory in Lithium and Catalysts for forecasted sales during the remainder of 2020.
(b) Included $117.8 million and $109.3 million at March 31, 2020 and December 31, 2019, respectively, of work in process in our Lithium segment.

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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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