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Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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Mar. 31, 2012
Derivative Instruments and Hedging Activities [Abstract] |
Fair value of the Company's derivative financial instruments on the consolidated statement of operations |
|  |  |  | (Gains) Losses Recognized in Income |
|  |  |  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
Derivative Instrument |  | Location of (Gain) or Loss |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
|  |  |  | (In thousands) |
Non-designated derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gold Collar |  | Other (income) expense |  | $ | 922 |  |  | $ | — |  |  | $ | (151 | ) |  | $ | — |

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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