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 |