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Derivative Financial Instruments - Summary of Classification of Fair Value on Derivatives Designated as Cash Flow Hedges (Details) - Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Prepaid expenses and other    
Derivatives, Fair Value [Line Items]    
Fair value of derivative asset $ 7,614  
Gold zero cost collars | Prepaid expenses and other    
Derivatives, Fair Value [Line Items]    
Fair value of derivative asset 0 $ 0
Gold zero cost collars | Accrued liabilities and other    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liability 33,926 $ 136
Foreign Exchange Forward | Prepaid expenses and other    
Derivatives, Fair Value [Line Items]    
Fair value of derivative asset 7,614  
Foreign Exchange Forward | Accrued liabilities and other    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liability $ 0