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Fair Value Measurements (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt and Capital Lease Obligations $ 198,857 $ 198,857 $ 479,979
Debt 12,039 12,039 10,431
Convertible Senior Notes Due March 2028 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt and Capital Lease Obligations   0 712
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     693
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
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
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     693
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
Senior Notes due 2021 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt and Capital Lease Obligations   175,991 [1] 373,433 [2]
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   184,373 [1] 227,487 [2]
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 [1] 0 [2]
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   184,373 [1] 227,487 [2]
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 [1] 0 [2]
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     15,580
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     15,207
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
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
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     15,580
Short Term Credit Agreement [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unamortized debt issuance expense     5,000
Debt [3]     94,489
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 [3]     99,500
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 [3]     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 [3]     99,500
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 [3]     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 $ 0   4,571
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
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
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 $ 0
[1] (1)Net of unamortized debt issuance costs and premium received of $2.0 million.
[2] (1)Net of unamortized debt issuance costs and premium received of $5.3 million.
[3] (2) Net of unamortized debt issuance costs of $5.0 million.