Derivative Financial Instruments - Summary of Pre-tax Gains (Losses) On Derivatives Designated as Cash Flow Hedges (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in OCI - effective portion:	$ (5,218)	$ 27,357
Gains (losses) reclassified from AOCI into net income - effective portion:	460	(2,721)
Gold zero cost collars
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in OCI - effective portion:	(3,386)	28,547
Gains (losses) reclassified from AOCI into net income - effective portion:	460	392
Foreign Exchange Forward
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in OCI - effective portion:	0	(1,190)
Gains (losses) reclassified from AOCI into net income - effective portion:	0	(3,113)
Gold Forwards
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) recognized in OCI - effective portion:	(1,832)	0
Gains (losses) reclassified from AOCI into net income - effective portion:	$ 0	$ 0