Fair Value Measurements (Details 3) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations	$ 402,257,000	$ 479,979,000
Debt	108,809,000	10,431,000
Convertible Senior Notes Due March 2028 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Face Amount		712,000
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	706,000	693,000
Convertible Senior Notes Due March 2028 [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures		712,000
Debt Instrument, Face Amount	0
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	706,000	693,000
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]
Long-term Debt and Capital Lease Obligations	373,957,000
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	362,650,000	227,487,000
Senior Notes due 2021 [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations		373,433,000
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	362,650,000	227,487,000
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	4,144,000	15,580,000
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	4,108,000	15,207,000
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	4,144,000	15,580,000
Short Term Credit Agreement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt issuance expense	4,500,000	5,000,000
Debt	94,545,000	94,489,000
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	94,545,000	99,500,000
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	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	94,545,000	99,500,000
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	0
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		4,571,000
San Bartolome Letter of Credit Facility [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		4,571,000
San Bartolome Letter of Credit Facility [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]
Line of Credit Facility, Fair Value of Amount Outstanding		0
San Bartolome Letter of Credit Facility [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]
Line of Credit Facility, Fair Value of Amount Outstanding		4,571,000
San Bartolome Letter of Credit Facility [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]
Line of Credit Facility, Fair Value of Amount Outstanding		0
Convertible Senior Notes Due March 2028 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt		$ 0
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	712,000
Convertible Senior Notes Due March 2028 [Member] \| Convertible Senior Notes Due March 2028 [Member] \| Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Debt, Fair Value Disclosures	$ 712,000

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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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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Fair value of the amount outstanding under the credit facility.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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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.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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