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Inventories (Tables) | 6 Months Ended
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Jun. 30, 2018
Inventory Disclosure [Abstract] |
Breakdown of 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 Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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