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Inventories | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at December 31, 2018 and 2017 (in thousands):
| December 31,
| 2018 |  | 2017
Finished goods(a) | $ | 482,355 |  |  | $ | 404,239 |
Raw materials and work in process(b) | 158,290 |  |  | 132,891 |
Stores, supplies and other | 59,895 |  |  | 55,651 |
Total(c) | $ | 700,540 |  |  | $ | 592,781 |
(a) | Increase primarily due to the build-up of inventory in our Lithium segment for a forecasted increase in sales in 2019.
(b) | Included $71.4 million and $59.6 million at December 31, 2018 and 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 consolidated balance sheets. See Note 3, “Divestitures,” for additional information.
Approximately 10% and 17% of our inventories are valued using the last-in, first-out (“LIFO”) method at December 31, 2018 and 2017, respectively. The portion of our domestic inventories stated on the LIFO basis amounted to $69.2 million and $99.6 million at December 31, 2018 and 2017, respectively, which are below replacement cost by approximately $32.8 million and $33.1 million, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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