Derivative Financial Instruments - Summary of Provisionally Priced Sales (Details) $ in Thousands	Sep. 30, 2019 USD ($) oz $ / oz
Silver concentrate sales agreements \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (10,406)
Derivative average price \| $ / oz	17.53
Outstanding Provisionally Priced Sales Consists of Silver \| oz	593,523
Silver concentrate sales agreements \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative average price \| $ / oz	0
Outstanding Provisionally Priced Sales Consists of Silver \| oz	0
Gold concentrates sales agreements \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (23,032)
Derivative average price \| $ / oz	1,472
Outstanding Provisionally Priced Sales Consists of Gold \| oz	15,652
Gold concentrates sales agreements \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative average price \| $ / oz	0
Outstanding Provisionally Priced Sales Consists of Gold \| oz	0
Zinc concentrates sales agreements [Member] \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (14,451)
Derivative average price \| $ / oz	1.07
Outstanding Provisionally Priced Sales Consists of Gold \| oz	13,512,379
Zinc concentrates sales agreements [Member] \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative average price \| $ / oz	0
Outstanding Provisionally Priced Sales Consists of Gold \| oz	0
Lead concentrates sales agreements [Member] \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (7,650)
Derivative average price \| $ / oz	0.93
Outstanding Provisionally Priced Sales Consists of Gold \| oz	8,212,898
Lead concentrates sales agreements [Member] \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Derivative average price \| $ / oz	0
Outstanding Provisionally Priced Sales Consists of Gold \| oz	0
Fixed Interest Rate Swap One
Derivative instruments Settlement
Derivative, notional amount	$ (50,000)
Fixed Interest Rate Swap Two
Derivative instruments Settlement
Derivative, notional amount	(75,000)
Fixed Interest Rate Swap Two \| 2018
Derivative instruments Settlement
Derivative, notional amount	(37,500)
Fixed interest rate swap payable	$ 240
Fixed Interest rate	2.51%
Fixed Interest Rate Swap Two \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Fixed interest rate swap payable	$ 0
Fixed Interest rate	0.00%
Variable Interest Rate Swap Two \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (37,500)
Variable interest rate swap receivable	$ 185
Average variable interest rate	2.37%
Variable Interest Rate Swap Two \| 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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- Definition

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

+ 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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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Average variable interest rate related to the group of interest rate derivatives.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 210
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