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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2011
Derivative Instruments  
Company's Outstanding Commodity Derivatives
                                                 
    Platinum     Palladium     Rhodium  
Settlement Period   Ounces     Avg. Price     Ounces     Avg. Price     Ounces     Avg. Price  
Third Quarter 2011
     25,028     $ 1,794       37,258     $ 763       5,643     $ 2,211  
Fourth Quarter 2011
     564     $ 1,711       676     $ 745       1,258     $ 2,055