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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2018
Inventory Disclosure [Abstract] |
Breakdown of Inventories | The following table provides a breakdown of inventories at September 30, 2018 and December 31, 2017 (in thousands):
| September 30, |  | December 31,
| 2018 |  | 2017
Finished goods(a) | $ | 503,970 |  |  | $ | 404,239 |
Raw materials and work in process(b) | 165,874 |  |  | 132,891 |
Stores, supplies and other | 57,537 |  |  | 55,651 |
Total(c) | $ | 727,381 |  |  | $ | 592,781 |
(a) | Increase primarily due to the build-up of inventory in our Lithium and Catalysts segments resulting from higher forecasted sales.
(b) | Increase primarily due to higher forecasted production levels in the fourth quarter from our Catalysts segment. Included $68.9 million and $59.6 million at September 30, 2018 and December 31, 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 condensed consolidated balance sheets. See Note 2, “Divestitures,” for additional information.

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