Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Derivative [Line Items]
Provisional gain (loss) on derivatives and commodity contracts	$ 492	$ (559)
Unrealized gain (loss) on hedger, net of tax	(5,218)	27,357
Termination of gold zero cost collars	3,139	0
Designated as Hedging Instrument
Derivative [Line Items]
Gains (losses) reclassified from AOCI into net income - effective portion:	460	(2,721)
Gains (losses) recognized in OCI - effective portion:	(5,218)	27,357
Designated as Hedging Instrument \| Gold zero cost collars
Derivative [Line Items]
After tax gains in AOCI	1,800
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	1,800
Gains (losses) reclassified from AOCI into net income - effective portion:	460	392
Gains (losses) recognized in OCI - effective portion:	(3,386)	$ 28,547
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

Cost to terminate zero cost collars related to a gold hedging program. Costs recorded to earnings.

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Costs to terminate gold zero cost collars recorded to other comprehensive income (loss)

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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.

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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.

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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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.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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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.

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