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Derivative Financial Instruments and Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Derivative Financial Instruments and Fair Value of Financial Instruments (Tables) [Abstract]  
Derivative instruments Settlement
                                 
    2011     2012     2013     Thereafter  
Palmarejo gold production royalty
  $ 14,712     $ 24,865     $ 25,097     $ 78,140  
Average gold price in excess of minimum contractual deduction
  $ 483     $ 497     $ 502     $ 493  
Notional ounces
    30,435       50,004       50,004       158,393  
 
                               
Mexican peso forward purchase contracts
  $ 15,600     $ 16,800     $     $  
Average rate (MXP/$)
  $ 12.49     $ 11.70     $     $  
Mexican peso notional amount
    194,771       196,568              
 
                               
Silver ounces receivable from Mandalay
  $ 764     $ 1,535     $     $  
Average silver forward price
  $ 18.33     $ 18.42     $     $  
Notional ounces
    41,667       83,333              
 
                               
Silver concentrate sales agreements
  $ 13,398     $     $     $  
Average silver price
  $ 39.28     $     $     $  
Notional ounces
    341,058                    
 
                               
Gold concentrates sales agreements
  $ 11,384     $     $     $  
Average gold price
  $ 1,524     $     $     $  
Notional ounces
    7,471                    
 
                               
Gold put options purchased
  $ 1,800     $ 2,880     $ 1,800     $ 720  
Average gold strike price
  $ 887     $ 923     $ 928     $ 991  
Notional ounces
    30,000       68,000       45,000       77,000  
 
                               
Gold call options sold
  $ 1,800     $ 2,880     $ 1,800     $ 720  
Average gold strike price
  $ 1,740     $ 1,817     $ 1,827     $ 1,960  
Notional ounces
    30,000       68,000       45,000       77,000  
Fair value of the derivative instruments
                                                 
    June 30, 2011  
                                    Current     Non-current  
    Prepaid     Other non-     Accrued     Other long-     portion of     portion of  
    expenses and     current     liabilities and     term     royalty     royalty  
    other     assets     other     liabilities     obligation     obligation  
Silver ounces receivable from
                                               
Mandalay
  $ 1,378     $ 680     $     $     $     $  
Forward foreign exchange contracts
    830             527                    
Palmarejo gold production royalty
                            33,425       131,466  
Put and call options, net
                1,449       11,623              
Concentrate sales contracts
    30             1,223                    
 
                                   
 
  $ 2,238     $ 680     $ 3,199     $ 11,623     $ 33,425     $ 131,466  
 
                                   
 
                                               
                                                 
    December 31, 2010  
                                    Current     Non-current  
    Prepaid     Other non-     Accrued     Other long-     portion of     portion of  
    expenses and     current     liabilities and     term     royalty     royalty  
    other     Assets     other     Liabilities     obligation     obligation  
Gold lease facility
  $     $     $ 2,213     $     $     $  
Gold forward contract
    425                                
Silver ounces receivable from Mandalay
    531       1,063                          
Forward foreign exchange contracts
    328             323                    
Palmarejo gold production royalty
                            28,745       133,258  
Put and call options, net
                1,471       13,277              
Concentrate sales contracts
    1,703             23                    
 
                                   
 
  $ 2,987     $ 1,063     $ 4,030     $ 13,277     $ 28,745     $ 133,258  
 
                                   
Gain losses on derivative instruments
                                         
            Three months ended     Six months ended  
            June 30,     June 30,  
Financial statement line   Derivative     2011     2010     2011     2010  
Sales of metal
  Concentrate sales contracts   $ (1,515 )   $ (536 )   $ (2,873 )   $ 51  
Production costs applicable to sales
  Forward foreign exchange contracts     859       489       1,111       40  
Fair value adjustments, net
  Gold lease facility           (2,137 )     (132 )     (2,729 )
Fair value adjustments, net
  Forward foreign exchange contracts     (707 )     (1,649 )     298       (1,192 )
Fair value adjustments, net
  Forward gold contract                 35        
Fair value adjustments, net
  Silver ounces receivable     (368 )           464        
Fair value adjustments, net
  Palmarejo gold royalty     (13,731 )     (33,663 )     (20,041 )     (38,512 )
Fair value adjustments, net
  Franco-Nevada warrant           1,030             2,333  
Fair value adjustments, net
  Put and call options     2,374       (6,097 )     1,676       (6,674 )
 
                               
 
          $ (13,088 )   $ (42,563 )   $ (19,462 )   $ (46,683 )