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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) on derivative instruments | $ 16,105 | $ (20,646) | $ (3,611) | $ 63,905
Embedded Derivative Financial Instruments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) on derivative instruments | 8,736 | (15,279) | (6,560) | 60,216
Rochester Royalty Obligation [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) on derivative instruments | 4,345 | (2,363) | 1,835 | (2,363)
Silver and gold options [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) on derivative instruments | 3,081 | (3,104) | 213 | 7,474
Foreign Exchange Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) on derivative instruments | (57) | 100 | 901 | (1,422)
Operating Segments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) on derivative instruments | $ 16,105 | $ (20,646) |  |

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: 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=7476318&loc=SL5618551-113959 + Details
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