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Inventories, Net - Summary of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished products $ 47,502 $ 48,484
In-process 35,790 30,913
Raw materials 46,958 46,440
Fine and fabricated precious metal in various stages of completion 25,393 29,202
Inventory, before LIFO reserve 155,643 155,039
LIFO reserve (2,555) (3,398)
Inventory, Net $ 153,088 $ 151,641