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Inventories - Summary of Determination Cost of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished and in-process products $ 34,035 $ 32,537
Raw materials and supplies 14,102 11,723
Inventory net $ 48,137 $ 44,260