Derivative Financial Instruments - Summary of Derivative Cash Flow Hedges (Details) - Designated as Hedging Instrument $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) oz $ / oz Rate
Gold Put Options - 2020
Derivative [Line Items]
Average gold strike price per ounce | $ / oz	1,447
Notional ounces | oz	153,000
Gold Call Options - 2020
Derivative [Line Items]
Average gold strike price per ounce | $ / oz	1,826
Notional ounces | oz	153,000
Gold Put Options - 2021
Derivative [Line Items]
Average gold strike price per ounce | $ / oz	1,600
Notional ounces | oz	12,000
Gold Call Options - 2021
Derivative [Line Items]
Average gold strike price per ounce | $ / oz	1,800
Notional ounces | oz	12,000
Mexican peso forward exchange contracts 2020
Derivative [Line Items]
Derivative, forward exchange rate | Rate	2409.00%
Derivative, notional amount | $	$ 45,000
Mexican peso forward exchange contracts 2021
Derivative [Line Items]
Derivative, forward exchange rate | Rate	2500.00%
Derivative, notional amount | $	$ 60,000
Canadian Forward Exchange Contracts 2020
Derivative [Line Items]
Derivative, forward exchange rate | Rate	144.00%
Derivative, notional amount | $	$ 25,000
Canadian Dollar Forward Purchase Contracts 2021
Derivative [Line Items]
Derivative, forward exchange rate | Rate	0.00%
Derivative, notional amount | $	$ 0