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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 73,642 $ 87,675
Work-in-process 27,848 22,024
Finished goods 263,445 288,669
Inventories $ 364,935 $ 398,368