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Reclamation and Mine Closure (Tables)
 6 Months Ended
Jun. 30, 2011
Reclamation and Mine Closure (Tables) [Abstract]  
Asset retirement obligation
                                 
    Three months ended     Six months ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Asset retirement obligation — Beginning
  $ 27,908     $ 25,689     $ 27,302     $ 25,112  
Accretion
    654       573       1,290       1,138  
Addition and changes in estimates
    —       —       —       18  
Settlements
    (5 )     (7 )     (35 )     (13 )
 
                       
Asset retirement obligation — June 30
  $ 28,557     $ 26,255     $ 28,557     $ 26,255