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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ (11,436) | $ 17,796
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 | (4,019) | 23,534
Palmarejo royalty obligation [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (6,218) | (9,105)
Rochester Royalty Obligation [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (673) | 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 | (1,494) | 4,227
Foreign Exchange Contract [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ 968 | $ (860)

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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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