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Inventories - Breakdown of inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 426,616 $ 454,162
Raw materials and work in process 240,881 219,896
Stores, supplies and other 78,101 76,179
Total inventories $ 745,598 $ 750,237