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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
Breakdown of Inventories | The following table provides a breakdown of inventories at December 31, 2018 and 2017 (in thousands):
| December 31,
| 2018 |  | 2017
Finished goods(a) | $ | 482,355 |  |  | $ | 404,239 |
Raw materials and work in process(b) | 158,290 |  |  | 132,891 |
Stores, supplies and other | 59,895 |  |  | 55,651 |
Total(c) | $ | 700,540 |  |  | $ | 592,781 |
(a) | Increase primarily due to the build-up of inventory in our Lithium segment for a forecasted increase in sales in 2019.
(b) | Included $71.4 million and $59.6 million at December 31, 2018 and 2017, respectively, of work in process related to lithium brine.
(c) | As of December 31, 2017, $24.7 million of Inventories were classified as Assets held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

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