Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Breakdown of Inventories

The following table provides a breakdown of inventories at December 31, 2017 and 2016 (in thousands):

	December 31,
	2017		2016
Finished goods(a)	$	404,239	$	289,102
Raw materials and work in process(b)	132,891		109,706
Stores, supplies and other	55,651		51,455
Total(c)	$	592,781	$	450,263

(a) Increase primarily due to the Jiangli New Materials acquisition and the build up of inventory at other Lithium sites for an increase in sales in 2018.

(b) Included $59.6 million and $47.1 million at December 31, 2017 and 2016, 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 consolidated balance sheets. See Note 3, “Divestitures,” for additional information.