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Derivative Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value adjustments, net | $ 16,105 | $ (20,646) | $ (3,611) | $ 63,905
Fair value adjustments, net | 11,076 | (17,664) | (6,558) | 64,963
Concentrate Sales Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Sales of Metals | (684) | 718 | (188) | (2,037)
Forward foreign exchange contract [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Costs applicable to sales | 0 | (99) | 924 | (732)
Fair value adjustments, net | (57) | 100 | 901 | (1,422)
Mexican peso forward purchase contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value adjustments, net | (57) | 100 | 901 | (1,422)
Palmarejo gold production royalty [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value adjustments, net | 8,736 | (15,279) | (6,560) | 60,216
Silver and gold options [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value adjustments, net | $ 3,081 | $ (3,104) | $ 213 | $ 7,474

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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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