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Derivative Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value adjustments, net | $ (11,436) | $ 17,796
Fair value adjustments, net | (10,808) | 16,669
Mexican peso forward purchase contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value adjustments, net | 968 | 738
Concentrate Sales Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Sales of Metals | 879 | (1,755)
Forward foreign exchange contract [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Production costs applicable to sales | (924) | 627
Fair value adjustments, net | 968 | (860)
Forward Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value adjustments, net | 0 | (1,598)
Palmarejo gold production royalty [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value adjustments, net | (10,237) | 14,429
Put and call options [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value adjustments, net | $ (1,494) | $ 4,228

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- Definition Production costs applicable to sales. + References No definition available. + Details
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- Definition Sales of metals. + References No definition available. + Details
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- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624186-113959 + Details
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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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