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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished goods $ 454,162 $ 495,639
Raw materials and work in process 219,896 205,781
Stores, supplies and other 76,179 67,564
Total inventories $ 750,237 $ 768,984