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Inventories (Tables) | 6 Months Ended
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Jun. 30, 2017
Inventory Disclosure [Abstract] |
Breakdown of Inventories | The following table provides a breakdown of inventories at June 30, 2017 and December 31, 2016 (in thousands):
| June 30, |  | December 31,
| 2017 |  | 2016
Finished goods(a) | $ | 385,798 |  |  | $ | 289,102 |
Raw materials and work in process(b) | 126,364 |  |  | 109,706 |
Stores, supplies and other | 53,732 |  |  | 51,455 |
Total inventories | $ | 565,894 |  |  | $ | 450,263 |
(a) | Increase primarily due to the Jiangli New Materials acquisition and the build up of inventory at several Lithium and Advanced Materials segment locations.
(b) | Included $53.7 million and $47.1 million at June 30, 2017 and December 31, 2016, respectively, of work in process related to the Lithium product category.

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