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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ (8,282) | $ 66,754 | $ (19,717) | $ 84,550
Embedded Derivative Financial Instruments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (5,061) | 61,066 | (15,296) | 75,495
Rochester Royalty Obligation [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (1,837) | 0 | (2,510) | 0
Gold Put Purchase and Call Sold Options Net [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (1,374) | 6,350 | (2,868) | 10,577
Foreign Exchange Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (10) | (662) | 957 | (1,522)
Operating Segments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ (8,282) | $ 66,754 |  |

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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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