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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 77,509 $ 87,675
Work-in-process 19,080 22,024
Finished goods 267,196 288,669
Inventories $ 363,785 $ 398,368