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FINANCIAL INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2011
FINANCIAL INSTRUMENTS  
Changes in AOCI balances pertaining to foreign hedging activities
    2011   2010  
 

AOCI, beginning of year

   $ —   $ —  
 

Loss reclassified from AOCI into production cost

     1,459     —  
 

Loss recognized in OCI

     (5,863 )   —  
             
 

AOCI, end of year

   $ (4,404 ) $ —  
             
 
Summary of the amounts recognized in the "Gain on derivative financial instruments" line item of the Consolidated Statements of Income
    2011   2010   2009  
 

Premiums realized on written foreign exchange call options

   $ 4,995   $ 4,845   $ 4,494  
 

Realized gain on foreign exchange extendible flat forward

     —     1,797     —  
 

Realized loss on foreign exchange forwards

     (1,407 )   —     —  
 

Realized gain on foreign exchange collar

     —     711     —  
 

Mark-to-market gain on foreign exchange extendible flat forward

     —     142     —  
 

Realized gain (loss) on zinc financial instruments

     3,419     3,733     (752 )
 

Realized gain (loss) on copper financial instruments

     79     (558 )   (150 )
 

Realized loss on silver financial instruments

     (3,403 )   (3,058 )   —  
                 
 

 

   $ 3,683   $ 7,612   $ 3,592