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Inventories Supplemental Inventory Information (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Precious metals stated at LIFO cost $ 10,087 $ 5,090
Precious metals stated under non-LIFO cost methods, primarily at fair value $ 14,413 $ 13,687
Market value per ounce, Silver (in dollars per ounce) 19.77 19.49
Market value per ounce, Gold (in dollars per ounce) 1,294.75 1,201.50
Market value per ounce, Palladium (in dollars per ounce) 771.00 711.00