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Derivative Financial Instruments - Narrative (Details) $ in Thousands | 3 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) oz | Aug. 31, 2020 oz | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016
Derivative [Line Items] |  |  |  |  |  |
Production to be sold, percent |  |  |  |  |  | 50.00%
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 |  |  | 337 | $ 111 | $ 631 |
Zinc options |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net derivative gain (loss) |  |  | 0 | 753 | 0 |
Interest rate swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net derivative gain (loss) |  |  | (178) | $ (60) | $ 0 |
Fixed Interest Rate Swap Two |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 75,000 |  | 75,000 |  |  |
Designated as Hedging Instrument | Gold zero cost collars |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Ounces of gold per month (in ounces) | oz | 21,000 |  |  |  |  |
After tax gains in AOCI |  |  | $ 500 |  |  |
Designated as Hedging Instrument | Gold zero cost collars | Forecast |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Ounces of gold per month (in ounces) | oz |  | 12,000 |  |  |  |

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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 + Details
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- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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