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Inventories | 9 Months Ended
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Sep. 30, 2019
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at September 30, 2019 and December 31, 2018 (in thousands):
| September 30, |  | December 31,
| 2019 |  | 2018
Finished goods(a)(b) | $ | 561,981 |  |  | $ | 482,355 |
Raw materials and work in process(c) | 173,973 |  |  | 158,290 |
Stores, supplies and other | 66,480 |  |  | 59,895 |
Total | $ | 802,434 |  |  | $ | 700,540 |
(a) | Increase primarily due to the build-up of inventory in our Lithium and Catalysts segments to meet higher projected sales during the remainder of 2019.
(b) | Included $96.3 million and $104.3 million at September 30, 2019 and December 31, 2018, respectively, of chemical grade spodumene in our Lithium segment, most of which is converted to battery-grade products either internally or through our tolling agreements. We expect this amount to continue to decrease in the fourth quarter of 2019.
(c) Included $70.3 million and $71.4 million at September 30, 2019 and December 31, 2018, 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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