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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2019
Inventory Disclosure [Abstract] |
Breakdown of 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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