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Note 12. Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Table Text Block] |
|  | Balance at December 31, 2011 |  |  | Balance at December 31, 2010 |  | Input Hierarchy Level
Assets: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds and other bank deposits |  | $ | 266,463 |  |  | $ | 283,606 |  | Level 1
Available for sale securities: |  |  |  |  |  |  |  |  |
Equity securities – mining industry |  |  | 3,923 |  |  |  | 2,668 |  | Level 1
Trade accounts receivable: |  |  |  |  |  |  |  |  |
Receivables from provisional concentrate sales |  |  | 10,996 |  |  |  | 36,295 |  | Level 2
Derivative contracts: |  |  |  |  |  |  |  |  |
Base metal forward contracts |  |  | 32,750 |  |  |  | — |  | Level 2
Restricted cash balances: |  |  |  |  |  |  |  |  |
Certificates of deposit and other bank deposits |  |  | 866 |  |  |  | 10,314 |  | Level 1
Total assets |  | $ | 314,998 |  |  | $ | 332,883 |  |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative contracts: |  |  |  |  |  |  |  |  |
Base metal forward contracts |  | $ | — |  |  | $ | 21,260 |  | Level 2

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets and liabilities that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 820 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -SubTopic 10 -Topic 820 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258 + Details
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