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FAIR VALUE MEASUREMENT (Tables)
 6 Months Ended
Jun. 30, 2011
FAIR VALUE MEASUREMENT  
Financial assets and liabilities measured at fair value within the fair value hierarchy
   
   Total   Level 1   Level 2   Level 3  
 

Financial assets:

                          
 

Cash equivalents, and short-term investments(1)

   $ 6,811   $ —   $ 6,811   $ —  
 

Available-for-sale securities(2)(3)

     100,654     92,401     8,253     —  
 

Trade receivables(4)

     64,821     —     64,821     —  
 

Derivative assets(3)

     2,148     —     2,148     —  
                     
 

 

   $ 174,434   $ 92,401   $ 82,033   $ —  
                     
 

Financial liabilities:

                          
 

Derivative liabilities(3)

     —     —     —     —  
                     

  • (1)
    Fair value approximates the carrying value due to the short-term nature.
    (2)
    Recorded at fair value using quoted market prices.

    (3)
    Recorded at fair value based on broker-dealer quotations.

    (4)
    Trade receivables from provisional invoices for concentrate sales are included within Level 2 as they are valued using quoted forward rates derived from observable market data on the month of expected settlement.