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Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Prepaid expenses and other [Member] |  |
Fair value of the derivative instruments |  |
Fair value of derivative asset | $ 1,539 | $ 184
Accrued liabilities and other [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value | 292 | 1,640
Current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value | 22,393 | 17,650
Non-current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value | 21,567 | 22,688
Forward foreign exchange contracts [Member] | Prepaid expenses and other [Member] |  |
Fair value of the derivative instruments |  |
Fair value of derivative asset | 49 | 38
Forward foreign exchange contracts [Member] | Accrued liabilities and other [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  | 947
Forward foreign exchange contracts [Member] | Current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  |
Forward foreign exchange contracts [Member] | Non-current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  |
Palmarejo gold production royalty [Member] | Prepaid expenses and other [Member] |  |
Fair value of the derivative instruments |  |
Fair value of derivative asset |  |
Palmarejo gold production royalty [Member] | Accrued liabilities and other [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  |
Palmarejo gold production royalty [Member] | Current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value | 22,393 | 17,650
Palmarejo gold production royalty [Member] | Non-current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value | 21,567 | 22,688
Put and call options, net [Member] |  |
Fair value of the derivative instruments |  |
Fair value of derivative asset | 1,298 |
Derivative Liability, Fair Value | 291 |
Put and call options, net [Member] | Prepaid expenses and other [Member] |  |
Fair value of the derivative instruments |  |
Fair value of derivative asset | 1,298 | 135
Put and call options, net [Member] | Accrued liabilities and other [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value | 291 |
Put and call options, net [Member] | Current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  |
Put and call options, net [Member] | Non-current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  |
Concentrate sales contracts [Member] | Prepaid expenses and other [Member] |  |
Fair value of the derivative instruments |  |
Fair value of derivative asset | 192 | 11
Concentrate sales contracts [Member] | Accrued liabilities and other [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value | 1 | 693
Concentrate sales contracts [Member] | Current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  |
Concentrate sales contracts [Member] | Non-current portion of royalty obligation [Member] |  |
Fair value of the derivative instruments |  |
Derivative Liability, Fair Value |  |
Mexican peso forward purchase contracts [Member] | Forward foreign exchange contracts [Member] |  |
Derivative [Line Items] |  |
Foreign exchange contracts of MXP |  | $ 12,000

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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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