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Inventories
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories:
The following table provides a breakdown of inventories at September 30, 2021 and December 31, 2020 (in thousands):
September 30,December 31,
20212020
Finished goods$426,616 $454,162 
Raw materials and work in process(a)
240,881 219,896 
Stores, supplies and other78,101 76,179 
Total$745,598 $750,237 

(a)Included $145.0 million and $129.6 million at September 30, 2021 and December 31, 2020, respectively, of work in process in our Lithium segment.