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

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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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fixed Interest Rate Swap One
Derivative [Line Items]
Derivative, Notional Amount	$ 50,000		$ 50,000
Concentrate Sales Contracts
Derivative [Line Items]
Provisional gain (loss) on derivatives and commodity contracts	(1,944)	$ (273)	(1,694)	$ (20)
Zinc options
Derivative [Line Items]
Net derivative gain (loss)	0	219	0	363
Interest rate swap
Derivative [Line Items]
Derivative, Notional Amount	75,000		75,000
Net derivative gain (loss)	(132)	$ (188)	(188)	$ (188)
Fixed Interest Rate Swap Two
Derivative [Line Items]
Derivative, Notional Amount	75,000		75,000
Derivative Instruments Settle in Year One [Member] \| Fixed Interest Rate Swap Two
Derivative [Line Items]
Derivative, Notional Amount	$ 75,000		$ 75,000