Derivative Financial Instruments - Summary of Provisionally Priced Sales (Details) $ in Thousands	Jun. 30, 2018 USD ($) oz $ / oz
Gold concentrates sales agreements \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (46,485)
Derivative average price \| $ / oz	1,298.94
Outstanding Provisionally Priced Sales Consists of Gold \| oz	35,787
Gold concentrates sales agreements \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative average price \| $ / oz	0.00
Outstanding Provisionally Priced Sales Consists of Gold \| oz	0
Zinc put options purchased
Derivative instruments Settlement
Derivative average price \| $ / oz	3,000.00
Zinc put options purchased \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (5,400)
Derivative, Nonmonetary Notional Amount \| oz	1,800
Derivative average price \| $ / oz	3,000.00
Zinc put options purchased \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative, Nonmonetary Notional Amount \| oz	0
Derivative average price \| $ / oz	0.00
Zinc call options sold \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (7,290)
Derivative, Nonmonetary Notional Amount \| oz	1,800
Derivative average price \| $ / oz	4,050.00
Zinc call options sold \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative, Nonmonetary Notional Amount \| oz	0
Derivative average price \| $ / oz	0.00
Fixed Interest Rate Swap \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (50,000)
Fixed interest rate swap payable	$ (1,281)
Fixed Interest rate	2.46%
Fixed Interest Rate Swap \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Fixed interest rate swap payable	$ 0
Fixed Interest rate	0.00%
Variable Interest Rate Swap \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (50,000)
Variable interest rate swap receivable	$ 1,088
Average variable interest rate	2.09%
Variable Interest Rate Swap \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Variable interest rate swap receivable	$ 0
Average variable interest rate	0.00%

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Derivative instruments Settlement.

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Outstanding provisionally priced sales consists of Gold.

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Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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- Definition

Average variable interest rate related to the group of interest rate derivatives.

+ References

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Fixed interest rate related to the interest rate derivative.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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