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Inventories | 6 Months Ended
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Jun. 30, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at June 30, 2018 and December 31, 2017 (in thousands):
| June 30, |  | December 31,
| 2018 |  | 2017
Finished goods(a) | $ | 452,958 |  |  | $ | 404,239 |
Raw materials and work in process(b) | 156,723 |  |  | 132,891 |
Stores, supplies and other | 55,841 |  |  | 55,651 |
Total(c) | $ | 665,522 |  |  | $ | 592,781 |
(a) | Increase primarily due to the build up of inventory in our Lithium segment resulting from increased sales, and the timing of net sales expected in the second half of our Catalysts segment.
(b) | Increase primarily due to higher forecasted production levels in the third quarter from our Catalysts segment. Included $67.0 million and $59.6 million at June 30, 2018 and December 31, 2017, respectively, of work in process related to the Lithium product category.
(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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- 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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