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Inventories, Net - Supplemental Inventory Information (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
$ / oz
Dec. 31, 2020
USD ($)
$ / oz
Inventory Disclosure [Abstract]    
Precious metals stated at LIFO cost | $ $ 4,084 $ 4,956
Precious metals stated under non-LIFO cost methods, primarily at fair value | $ $ 34,679 $ 26,033
Market value per ounce:    
Silver (in dollars per ounce) 22.43 26.28
Gold (in dollars per ounce) 1,751.65 1,891.7
Palladium (in dollars per ounce) 1,968.54 2,448.54