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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials, consumables and supplies, net $ 75,708 $ 57,011
Work in process 151 322
Finished goods, net 117,039 84,128
Total $ 192,898 $ 141,461