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Derivative Financial Instruments - Summary of Provisionally Priced Sales (Details) $ in Thousands | Mar. 31, 2018 USD ($) oz $ / oz
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Silver concentrate sales agreements | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ (831)
Derivative average price | 16.66
Outstanding Provisionally Priced Sales Consists of Silver | oz | 49,853
Silver concentrate sales agreements | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 0
Derivative average price | 0.00
Outstanding Provisionally Priced Sales Consists of Silver | oz | 0
Gold concentrates sales agreements | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ (59,332)
Derivative average price | 1,317.00
Outstanding Provisionally Priced Sales Consists of Gold | oz | 45,051
Gold concentrates sales agreements | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 0
Derivative average price | 0.00
Outstanding Provisionally Priced Sales Consists of Gold | oz | 0
Zinc Put Options, Purchased [Member] |
Derivative instruments Settlement |
Derivative average price | 3,000.00
Zinc Put Options, Purchased [Member] | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ (8,100)
Derivative, Nonmonetary Notional Amount | oz | 2,700
Derivative average price | 3,000.00
Zinc Put Options, Purchased [Member] | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 0
Derivative, Nonmonetary Notional Amount | oz | 0
Derivative average price | 0.00
Zinc Call Options, Sold [Member] | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ (10,935)
Derivative, Nonmonetary Notional Amount | oz | 2,700
Derivative average price | 4,050.00
Zinc Call Options, Sold [Member] | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 0
Derivative, Nonmonetary Notional Amount | oz | 0
Derivative average price | 0.00

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