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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventories [Abstract]    
Finished goods $ 50,132 $ 59,452
Work-in-process 6,429 7,474
Raw materials and supplies 11,795 6,506
Inventories $ 68,356 $ 73,432