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Inventories, Net - Summary of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished products $ 42,460 $ 48,484
In-process 29,420 30,913
Raw materials 48,228 46,440
Fine and fabricated precious metal in various stages of completion 25,827 29,202
Inventory, before LIFO reserve 145,935 155,039
LIFO reserve (2,012) (3,398)
Inventory, Net $ 143,923 $ 151,641