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Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Derivative [Line Items] |  |  |  |  |
Provisional gain (loss) on derivatives and commodity contracts |  | $ (757) | $ 79 | $ (751) | $ (618)
Unrealized gain (loss) on hedger, net of tax |  | 29,060 | 1,349 | 58,087 | 25,723
Termination of gold zero cost collars |  | 0 | 0 | 3,139 | 0
Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) reclassified from AOCI into net income - effective portion: |  | (9,910) | (3,902) | (11,181) | (9,683)
Gains (losses) recognized in OCI - effective portion: |  | 29,060 | 1,349 | 58,087 | 25,723
Designated as Hedging Instrument | Gold zero cost collars |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) reclassified from AOCI into net income - effective portion: |  | 1,379 | 23 | 3,218 | 853
Gains (losses) recognized in OCI - effective portion: |  | 0 | 1,614 | (4,598) | 25,590
Unrealized gain (loss) on hedger, net of tax |  |  |  | 7,700 |
Termination of gold zero cost collars |  |  |  | 3,100 |
Termination of zero gold cost collars recorded to other comprehensive income (loss) |  |  |  | 4,600 |
Designated as Hedging Instrument | Gold zero cost collars | Forecast |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | $ 1,400 |  |  |  |
Designated as Hedging Instrument | Gold Forwards |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
After tax gains in AOCI |  |  |  | 47,100 |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  | 41,800 |
Gains (losses) reclassified from AOCI into net income - effective portion: |  | (11,289) | 0 | (14,399) | 0
Gains (losses) recognized in OCI - effective portion: |  | $ 29,060 | $ 0 | $ 62,685 | $ 0

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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- Definition Amount, after tax and 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 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 2: 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=124509347&loc=SL7669646-108580 + 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=124509347&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=124509347&loc=d3e637-108580 + Details
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