Derivative Financial Instruments - Summary of Provisionally Priced Sales (Details) $ in Thousands	Mar. 31, 2019 USD ($) oz $ / oz
Silver concentrate sales agreements \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (5,712)
Derivative average price \| $ / oz	15.11
Outstanding Provisionally Priced Sales Consists of Silver \| oz	378,139
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	$ (10,657)
Derivative average price \| $ / oz	1,303.13
Outstanding Provisionally Priced Sales Consists of Gold \| oz	8,178
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	$ (11,581)
Derivative average price \| $ / oz	1.27
Outstanding Provisionally Priced Sales Consists of Gold \| oz	9,099,116
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	$ (4,234)
Derivative average price \| $ / oz	0.91
Outstanding Provisionally Priced Sales Consists of Gold \| oz	4,648,252
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
Fixed Interest Rate Swap One \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (50,000)
Fixed interest rate swap payable	$ 323
Fixed Interest rate	2.46%
Fixed Interest Rate Swap One \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Fixed interest rate swap payable	$ 0
Fixed Interest rate	0.00%
Variable Interest Rate Swap One \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (50,000)
Variable interest rate swap receivable	$ 326
Average variable interest rate	2.49%
Variable Interest Rate Swap One \| Thereafter
Derivative instruments Settlement
Derivative, notional amount	$ 0
Variable interest rate swap receivable	$ 0
Average variable interest rate	0.00%
Fixed Interest Rate Swap Two \| 2018
Derivative instruments Settlement
Derivative, notional amount	$ (75,000)
Fixed interest rate swap payable	$ 960
Fixed Interest rate	2.50%
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	$ (75,000)
Variable interest rate swap receivable	$ 911
Average variable interest rate	2.49%
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

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+ 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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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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