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Derivative Financial Instruments (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
oz
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
oz
$ / oz
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jan. 21, 2009
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Fair Value Assumptions, Risk Free Interest Rate       19.90%    
Gain (loss) on derivative instruments     $ (11,581,000) $ 5,202,000 $ 3,618,000  
Price per ounce under agreement     416      
Franco-Nevada warrant [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Fair value liability of the embedded derivative       5,000,000    
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net     5,900,000 17,000,000 18,400,000  
Realized losses     $ 10,800,000 13,900,000 20,400,000  
Palmarejo gold production royalty [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Production to be sold, percent           50.00%
Payment made for gold on the end of royalty obligation | oz 4,167   4,167      
Percentage of Gold Production     50.00%      
Annual Inflation Compounding Adjustment     1.00%      
Concentrate Sales Contracts [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Unrealized Gain (Loss) on Derivatives and Commodity Contracts $ 300,000 $ 100,000   300,000    
Unrealized Gain (Loss) on Derivatives     $ (254,000) 296,000 (123,000)  
Embedded Derivative Financial Instruments [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Gain (loss) on derivative instruments     (5,866,000) 3,101,000 (2,001,000)  
Silver and gold options [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Gain (loss) on derivative instruments       1,300,000 600,000  
Unrealized Gain (Loss) on Derivatives     0   1,500,000  
Derivative, Gain (Loss) on Derivative, Net     $ (1,582,000) 1,283,000 1,058,000  
Maximum [Member] | Palmarejo gold production royalty [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Payable ounces under royalty obligation | oz     400,000      
Derivative Instruments Settle in Year One [Member] | Silver concentrate sales agreements [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Outstanding provisionally priced sales consists of silver | oz     354,771      
Derivative Average Price | $ / oz     16.35      
Derivative Instruments Settle in Year One [Member] | Gold concentrates sales agreements [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Outstanding provisionally priced sales consists of Gold | oz     25,505      
Derivative Average Price | $ / oz     1,208      
Palmarejo Royalty Obligation [Member]            
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value     $ 0 $ 4,957,000 $ 21,912,000