Fair Value Measurements (Details 3) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 9,121	$ 17,498
Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	9,141	14,785
Fair Value, Inputs, Level 1 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	0	0
Fair Value, Inputs, Level 2 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	9,141	14,785
Fair Value, Inputs, Level 3 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	0	0
Convertible Senior Notes Due March 2028 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Face Amount		0
Convertible Senior Notes Due March 2028 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	689	4,979
Convertible Senior Notes Due March 2028 [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Face Amount	712
Convertible Debt, Fair Value Disclosures		5,334
Convertible Senior Notes Due March 2028 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	0	0
Convertible Senior Notes Due March 2028 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	689	4,979
Convertible Senior Notes Due March 2028 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	0	0
Senior Notes due 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	435,234
Senior Notes due 2021 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	367,701	343,305
Senior Notes due 2021 [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt		437,454
Senior Notes due 2021 [Member] \| Fair Value, Inputs, Level 1 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	0	0
Senior Notes due 2021 [Member] \| Fair Value, Inputs, Level 2 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	367,701	343,305
Senior Notes due 2021 [Member] \| Fair Value, Inputs, Level 3 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	0	0
Palmarejo gold production royalty [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	27,903	38,290
Palmarejo gold production royalty [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	25,488	34,047
Palmarejo gold production royalty [Member] \| Fair Value, Inputs, Level 1 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	0	0
Palmarejo gold production royalty [Member] \| Fair Value, Inputs, Level 2 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	0	0
Palmarejo gold production royalty [Member] \| Fair Value, Inputs, Level 3 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Not Measured at Fair Value	27,903	38,290
San Bartolome Letter of Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	9,141	$ 14,785
Short Term Credit Agreement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	100,000
Short Term Credit Agreement [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	100,000
Short Term Credit Agreement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	0
Short Term Credit Agreement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	100,000
Short Term Credit Agreement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Portion at Other than Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 0

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.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

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- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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- Definition

Face (par) amount of debt instrument at time of issuance.

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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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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-Publisher FASB

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-Topic 860

-SubTopic 20

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-Paragraph 4D

-Subparagraph (c)(2)

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-Topic 815

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value of the amount outstanding under the credit facility.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Section S99

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-Subparagraph (SX 210.9-03.16)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

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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

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