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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 495,639 $ 482,355
Raw materials and work in process 205,781 158,290
Stores, supplies and other 67,564 59,895
Total inventories $ 768,984 $ 700,540