Derivative Financial Instruments - Summary of Provisionally Priced Sales (Details) $ in Thousands	Sep. 30, 2018 USD ($) oz $ / oz
Silver concentrate sales agreements \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (1,444)
Derivative average price \| $ / oz	14.61
Outstanding Provisionally Priced Sales Consists of Silver \| oz	98,832
Silver concentrate sales agreements \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative average price \| $ / oz	0.00
Outstanding Provisionally Priced Sales Consists of Silver \| oz	0
Gold concentrates sales agreements \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (14,802)
Derivative average price \| $ / oz	1,224.42
Outstanding Provisionally Priced Sales Consists of Gold \| oz	12,089
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 concentrates sales agreements [Member] \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (2,123)
Derivative average price \| $ / oz	1.20
Outstanding Provisionally Priced Sales Consists of Gold \| oz	1,772,075
Zinc concentrates sales agreements [Member] \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative average price \| $ / oz	0.00
Outstanding Provisionally Priced Sales Consists of Gold \| oz	0
Lead concentrates sales agreements [Member] \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (1,130)
Derivative average price \| $ / oz	0.92
Outstanding Provisionally Priced Sales Consists of Gold \| oz	1,230,193
Lead concentrates sales agreements [Member] \| 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	$ (2,700)
Derivative, Nonmonetary Notional Amount \| oz	900
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	$ (3,645)
Derivative, Nonmonetary Notional Amount \| oz	900
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	$ 960
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	$ 979
Average variable interest rate	2.51%
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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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- Definition

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