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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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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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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Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative [Line Items]
Provisional gain (loss) on derivatives and commodity contracts	$ (137)	$ 713	$ (697)	$ 1,213
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			7,400
Designated as Hedging Instrument \| Gold zero cost collars
Derivative [Line Items]
After tax gains in AOCI			$ 7,500