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Fair Value Measurements (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Mar. 12, 2014
Jan. 29, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt and Capital Lease Obligations $ 479,979 $ 451,048    
Debt 10,431 17,498    
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 693 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 693 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 Instrument, Face Amount     $ 150,000 $ 300,000
Long-term Debt and Capital Lease Obligations 373,433      
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 227,487 343,305    
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   427,603    
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 227,487 343,305    
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 15,580 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 15,207 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 15,580 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 4,571 14,785    
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 14,785    
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 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 14,785    
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 $ 0    
Short Term Credit Agreement [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt 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 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 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 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 $ 0