|
Supplemental Inventory Information (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Precious metals stated at LIFO cost | $ 5,460 | $ 4,447 |
| Market value per ounce, Silver (in dollars per ounce) | 30.20 | 27.95 |
| Market value per ounce, Gold (in dollars per ounce) | 1,675.40 | 1,565.80 |
| Market value per ounce, Palladium (in dollars per ounce) | 702.85 | 655.40 |