Income and Mining Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Income Tax Examination [Line Items]
Valuation allowance	$ 490,044	$ 479,846
United States
Income Tax Examination [Line Items]
Valuation allowance	268,119	262,059
Canada
Income Tax Examination [Line Items]
Valuation allowance	200,319	194,727
Mexico
Income Tax Examination [Line Items]
Valuation allowance	408	723
New Zealand
Income Tax Examination [Line Items]
Valuation allowance	21,013	22,229
Other jurisdictions
Income Tax Examination [Line Items]
Valuation allowance	$ 185	$ 108