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Derivative Financial Instruments (Details) $ in Thousands | Mar. 31, 2017 USD ($) oz $ / oz
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Silver concentrate sales agreements [Member] | 2016 [Member] |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 1,403
Derivative average price | $ / oz | 18
Outstanding Provisionally Priced Sales Consists of Silver | oz | 79,084
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 | $ | $ 35,849
Derivative average price | $ / oz | 1,211
Outstanding Provisionally Priced Sales Consists of Gold | oz | 29,603
Gold concentrates sales agreements [Member] | Thereafter [Member] |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 0
Derivative average price | $ / oz | 0
Notional ounces | oz | 0

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