Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Breakdown of Inventories

The following table provides a breakdown of inventories at March 31, 2019 and December 31, 2018 (in thousands):

	March 31,		December 31,
	2019		2018
Finished goods(a)	$	535,201	$	482,355
Raw materials and work in process(b)	159,429		158,290
Stores, supplies and other	61,563		59,895
Total	$	756,193	$	700,540

(a) Increase primarily due to the build-up of inventory in our Lithium and Catalysts segments for a forecasted increase in sales in 2019.

(b)

Included $76.4 million and $71.4 million at March 31, 2019 and December 31, 2018, respectively, of work in process related to lithium brine.