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Derivative Financial Instruments (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
oz
$ / oz
Mar. 31, 2015
USD ($)
Derivative [Line Items]    
Remaining ounces under royalty obligation | oz 20,994  
Gain (loss) on derivative instruments $ (8,695,000) $ (4,884,000)
Derivative instruments Settlement    
Price per ounce under agreement 416  
Palmarejo gold production royalty [Member] | 2016 [Member]    
Derivative instruments Settlement    
Derivative, notional amount 17,240,000  
Price per ounce under agreement $ 821  
Notional ounces | oz 20,994  
Palmarejo gold production royalty [Member] | Thereafter [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 0  
Price per ounce under agreement $ 0  
Notional ounces | oz 0  
Silver concentrate sales agreements [Member] | 2016 [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 6,736,000  
Derivative average price | $ / oz 15.36  
Outstanding Provisionally Priced Sales Consists of Silver | oz 438,573  
Silver concentrate sales agreements [Member] | Thereafter [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 0  
Derivative average price | $ / oz 0  
Notional ounces | oz 0  
Gold concentrates sales agreements [Member] | 2016 [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 45,868,000  
Derivative average price | $ / oz 1,183  
Outstanding Provisionally Priced Sales Consists of Gold | oz 38,773  
Gold concentrates sales agreements [Member] | Thereafter [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 0  
Derivative average price | $ / oz 0  
Notional ounces | oz 0  
Silver put options purchased [Member] | 2016 [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 4,500,000  
Derivative, Weighted Average Strike Price of Put Options | $ / oz 15.00  
Silver put options purchased [Member] | Thereafter [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 0  
Derivative, Weighted Average Strike Price of Put Options | $ / oz 0.00  
Notional ounces | oz 0  
Silver Put Options Sold [Member] | 2016 [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 4,200,000  
Derivative, Weighted Average Strike Price of Put Options | $ / oz 14.00  
Notional ounces | oz 300,000  
Silver Put Options Sold [Member] | Thereafter [Member]    
Derivative instruments Settlement    
Derivative, notional amount $ 0  
Derivative, Weighted Average Strike Price of Put Options | $ / oz 0.00  
Notional ounces | oz 0