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 |