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Precious Metals
9 Months Ended
Sep. 30, 2011
Precious Metals [Abstract] 
Precious Metals
Note 5: Precious Metals Precious metals are included in supplies, prepaid items and other in the accompanying condensed consolidated balance sheets. In addition, precious metals expense (recoveries), net, is included in cost of sales in the accompanying condensed consolidated statements of income.
Precious metals expense (recoveries), net, consists of the following:
                                 
    Nine Months Ended     Three Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
    (In Thousands)  
Precious metals expense
  $ 6,101     $ 4,508     $ 1,591     $ 1,047  
Recoveries of precious metals
    (4,654 )     (751 )     (2,012 )     (751 )
Gains on sales of precious metals
    (33 )     (112 )     (33 )      
 
                       
Precious metals expense (recoveries), net
  $ 1,414     $ 3,645     $ (454 )   $ 296