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Inventories, Net - Summary of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished products $ 44,306 $ 48,484
In-process 29,843 30,913
Raw materials 44,882 46,440
Fine and fabricated precious metal in various stages of completion 33,447 29,202
Inventory, before LIFO reserve 152,478 155,039
LIFO reserve (2,920) (3,398)
Inventory, Net $ 149,558 $ 151,641