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Inventories | 3 Months Ended
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Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at March 31, 2018 and December 31, 2017 (in thousands):
| March 31, |  | December 31,
| 2018 |  | 2017
Finished goods(a) | $ | 453,662 |  |  | $ | 404,239 |
Raw materials and work in process(b) | 154,679 |  |  | 132,891 |
Stores, supplies and other | 58,226 |  |  | 55,651 |
Total(c) | $ | 666,567 |  |  | $ | 592,781 |
(a) | Increase primarily due to the build up of inventory in our Catalysts segment due to the timing of net sales expected in the second quarter, and an increased net sales in the near term for our Lithium segment.
(b) | Increase primarily due to higher forecasted production levels in the second quarter from our Catalysts segment. Included $66.2 million and $59.6 million at March 31, 2018 and December 31, 2017, respectively, of work in process related to the Lithium product category.
(c) | As of March 31, 2018 and December 31, 2017, $23.0 million and $24.7 million, respectively, 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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- 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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