Derivative Financial Instruments - Summary of Classification of Fair Value on Derivatives Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Designated as Hedging Instrument | Prepaid expenses and other | Level 2
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	$ 4,904	$ 13,747
Gold zero cost collars
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	1,560
Fair value of derivative liability		24,883
Gold zero cost collars | Level 2
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	1,560
Fair value of derivative liability		24,883
Gold zero cost collars | Designated as Hedging Instrument | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		0
Gold zero cost collars | Designated as Hedging Instrument | Accrued liabilities and other
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	0
Gold zero cost collars | Designated as Hedging Instrument | Accrued liabilities and other | Level 2
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	0	24,883
Foreign Exchange Forward
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	3,344	13,747
Foreign Exchange Forward | Level 2
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	3,344	13,747
Foreign Exchange Forward | Designated as Hedging Instrument | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		13,747
Foreign Exchange Forward | Designated as Hedging Instrument | Accrued liabilities and other
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	$ 0	$ 0