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Inventories (Summary) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished products $ 32,339 $ 31,355
In-process 18,482 19,873
Raw materials 34,318 18,451
Fine and fabricated precious metals in various stages of completion 15,019 13,155
Inventory, before LIFO reserve 100,158 82,834
LIFO reserve (703) (30)
Inventory, Net $ 99,455 $ 82,804