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Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt | $ 457,744 | $ 306,130
Senior Notes due 2021 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt | 440,075 | 300,000
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Convertible Senior Notes Due March 2028 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 5,187 | 5,067
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Convertible Senior Notes Due March 2028 [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 0 | 5,067
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Convertible Senior Notes Due March 2028 [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 5,187 | 0
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Convertible Senior Notes Due March 2028 [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 0 | 0
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Senior Notes due 2021 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt | 408,156 | 307,314
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt | 0 | 307,314
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt | 408,156 | 0
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Senior Notes due 2021 [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt | 0 | 0
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Palmarejo gold production royalty [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities Not Measured at Fair Value | 44,931 | 65,212
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Palmarejo gold production royalty [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities Not Measured at Fair Value | 0 | 0
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Palmarejo gold production royalty [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities Not Measured at Fair Value | 0 | 0
Portion at Other than Fair Value, Fair Value Disclosure [Member] | Palmarejo gold production royalty [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities Not Measured at Fair Value | 44,931 | 65,212
Reported Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 5,334 | 5,334
Reported Value Measurement [Member] | Senior Notes due 2021 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of long-term debt |  | 300,000
Reported Value Measurement [Member] | Palmarejo gold production royalty [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities Not Measured at Fair Value | $ 38,137 | $ 51,193

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or 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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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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