Income and Mining Taxes - Summary of Tax Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Tax Credit Carryforward [Line Items]
Regular net operating losses	$ 981,709
Capital losses	56,534
Foreign tax credits	21,614
United States
Tax Credit Carryforward [Line Items]
Regular net operating losses	466,708
Capital losses	56,534
Foreign tax credits	21,614
Canada
Tax Credit Carryforward [Line Items]
Regular net operating losses	392,061
Mexico
Tax Credit Carryforward [Line Items]
Regular net operating losses	44,257
New Zealand
Tax Credit Carryforward [Line Items]
Regular net operating losses	77,764
Other jurisdictions
Tax Credit Carryforward [Line Items]
Regular net operating losses	$ 919