XML 42 R52.htm IDEA: XBRL DOCUMENT v3.19.3
Note 11 - Derivative Instruments (Details Textual)
$ in Thousands, $ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Oct. 31, 2019
USD ($)
$ / oz
Sep. 30, 2019
MXN ($)
Sep. 30, 2019
CAD ($)
Maximum Allocation of Forecasted CAD-demonimated Operating Costs 75.00%   75.00%     75.00% 75.00%
Forecasted CAD-denominated Operating Costs to be Hedged, Term     5 years        
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance $ (4,300)   $ (4,300)        
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months (1,300)   (1,300)        
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net     (1,200)        
Derivative, Net Hedge Ineffectiveness Gain (Loss)     0        
Derivative, Gain (Loss) on Derivative, Net, Total     (5,824) $ 15,208      
Gain (Loss) on Sale of Derivatives (4,718) $ 19,460 (2,719) $ 40,271      
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total 12,400   12,400        
Derivative, Fair Value, Obligations Under the Agreements 12,400   12,400        
Foreign Exchange Contract [Member] | Other Current Assets [Member]              
Derivative Asset, Current 100   100        
Foreign Exchange Contract [Member] | Other Current Liabilities [Member]              
Derivative Assets, Noncurrent, Total 1,400   1,400        
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member]              
Derivative Liability, Noncurrent $ 2,900   $ 2,900        
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Minimum [Member]              
Derivative, Forward Exchange Rate 1.2702   1.2702     1.2702 1.2702
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Maximum [Member]              
Derivative, Forward Exchange Rate 1.3332   1.3332     1.3332 1.3332
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member]              
Derivative, Number of Instruments Held, Total 135   135     135 135
Derivative, Notional Amount $ 231,500   $ 231,500       $ 300.7
Foreign Exchange Contract [Member] | San Sebastian [Member] | Minimum [Member]              
Derivative, Forward Exchange Rate 20.4100   20.4100     20.4100 20.4100
Foreign Exchange Contract [Member] | San Sebastian [Member] | Maximum [Member]              
Derivative, Forward Exchange Rate 20.8550   20.8550     20.8550 20.8550
Foreign Exchange Contract [Member] | San Sebastian [Member] | Designated as Hedging Instrument [Member]              
Derivative, Number of Instruments Held, Total 10   10     10 10
Derivative, Notional Amount $ 1,800   $ 1,800     $ 37.3  
Silver Contracts [Member] | Subsequent Event [Member]              
Derivative, Average Price Risk Option Strike Price | $ / oz         16.00    
Gold Contracts [Member] | Subsequent Event [Member]              
Derivative, Notional Amount         $ 3,200    
Derivative, Average Price Risk Option Strike Price | $ / oz         1,450    
Commodity Contract [Member]              
Derivative Asset, Current 1,100   1,100        
Derivative Asset, Total 700   700        
Derivative Liability, Current 7,100   7,100        
Derivative Liability, Total 400   400        
Unsettled Concentrate Sales Contracts [Member]              
Derivative, Gain (Loss) on Derivative, Net, Total     (100)        
Forecasted Future Concentrate Contracts [Member]              
Derivative, Gain (Loss) on Derivative, Net, Total     $ 2,700        
Gain (Loss) on Sale of Derivatives $ 6,700 $ 32,800