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Fair Value Measurement - Statement Of Income Classification (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value Statement Of Income Classification [Line Items]
Realized loss on zinc zero cost collar	$ 40		$ 40
Sales, net
Fair Value Statement Of Income Classification [Line Items]
Realized/unrealized derivative (loss) gain, net	(478)	$ 550	156	$ 18
Other expenses, net
Fair Value Statement Of Income Classification [Line Items]
Realized/unrealized gold and silver rounds/bullion gain (loss), net	$ (55)	$ 716	$ (86)	$ 1,175

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- Definition

Fair Value Statement Of Income Classification [Line Items]

+ References

No definition available.

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- Definition

Realized Gain Loss On Zinc Zero Cost Collar

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959

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-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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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=121586364&loc=d3e3602-108585

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