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Derivative Financial Instruments - Narrative (Details) $ in Thousands | 3 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 oz | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Aug. 31, 2020 oz | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
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 |  | 233 | $ 34 |  | (1,461) | $ 15
Zinc options |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net derivative gain (loss) |  | 0 | 225 |  | 0 |
Interest rate swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  | 37,500 |  |  | 37,500 |
Net derivative gain (loss) |  | 15 | $ 206 |  | (173) | $ 18
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 |  | $ 37,500 |  |  | 37,500 |
Designated as Hedging Instrument | Gold zero cost collars |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
After tax gains in AOCI |  |  |  |  | $ 1,100 |
Designated as Hedging Instrument | Gold zero cost collars | Forecast |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Ounces of gold per month (in ounces) | oz | 21,000 |  |  | 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 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 + 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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- 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 + Details
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