The following table provides a breakdown of inventories at December 31, 2016 and 2015 (in thousands):
 
December 31,
 
2016
 
2015
Finished goods
$
289,102

 
$
264,025

Raw materials and work in process(a)
109,706

 
122,038

Stores, supplies and other
51,455

 
53,450

Total inventories(b)
$
450,263

 
$
439,513


(a)
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.
(b)
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.