Inventories (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Finished goods		$ 289,102	$ 264,025
Raw materials and work in process	[1]	109,706	122,038
Stores, supplies and other		51,455	53,450
Total inventories		$ 450,263	$ 439,513	[2]

[1] Included $47.1 million and $39.1 million at December 31, 2016 and 2015, respectively, of work in process related to the Lithium product category.

[2] As of December 31, 2015, $162.8 million of Inventories were classified as Assets held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.