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Inventories | 6 Months Ended
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Jun. 30, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories: The following table provides a breakdown of inventories at June 30, 2017 and December 31, 2016 (in thousands):
| June 30, |  | December 31,
| 2017 |  | 2016
Finished goods(a) | $ | 385,798 |  |  | $ | 289,102 |
Raw materials and work in process(b) | 126,364 |  |  | 109,706 |
Stores, supplies and other | 53,732 |  |  | 51,455 |
Total inventories | $ | 565,894 |  |  | $ | 450,263 |
(a) | Increase primarily due to the Jiangli New Materials acquisition and the build up of inventory at several Lithium and Advanced Materials segment locations.
(b) | Included $53.7 million and $47.1 million at June 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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