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Inventories - Breakdown of inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 656,475 $ 473,836
Raw materials and work in process 276,150 259,221
Stores, supplies and other 81,168 79,863
Total inventories $ 1,013,793 $ 812,920