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Inventories | 9 Months Ended
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Sep. 30, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at September 30, 2017 and December 31, 2016 (in thousands):
| September 30, |  | December 31,
| 2017 |  | 2016
Finished goods(a) | $ | 420,059 |  |  | $ | 289,102 |
Raw materials and work in process(b) | 135,025 |  |  | 109,706 |
Stores, supplies and other | 55,128 |  |  | 51,455 |
Total | $ | 610,212 |  |  | $ | 450,263 |
(a) | Increase primarily due to the Jiangli New Materials acquisition and other lithium sites, as well as the build up of inventory in our Refining Solutions segment for an increase in sales in the fourth quarter.
(b) | Included $56.0 million and $47.1 million at September 30, 2017 and December 31, 2016, respectively, of work in process related to the Lithium product category.

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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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