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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Inventories [Abstract]    
Finished goods $ 47,387 $ 50,132
Work-in-process 7,150 6,429
Raw materials and supplies 15,443 11,795
Inventories $ 69,980 $ 68,356