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Reclamation and Mine Closure Costs (Tables)
 12 Months Ended
Dec. 31, 2011
Reclamation and Mine Closure Costs [Abstract]  
Asset Retirement Obligation
                 
    Years Ended
December  31,		  
    2011     2010  

Asset retirement obligation — January 1

   $ 27,302     $ 38,193  

Adjustment to remove Cerro Bayo Disc. Operations(A)

     —       (13,081 ) 

Accretion

     2,648       2,334  

Additions and changes in estimates

     2,822       (104 ) 

Settlements

     (58 )      (40 ) 
   

 

 

    

 

 

  

Asset retirement obligation — December 31

   $ 32,714     $ 27,302