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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventories [Abstract]    
Finished goods $ 55,520 $ 50,132
Work-in-process 7,550 6,429
Raw materials and supplies 19,586 11,795
Inventories $ 82,656 $ 68,356