Income and Mining Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Examination [Line Items]
Valuation allowance	$ 479,846	$ 444,989
United States
Income Tax Examination [Line Items]
Valuation allowance	262,059	245,899
Canada
Income Tax Examination [Line Items]
Valuation allowance	194,727	178,310
Mexico
Income Tax Examination [Line Items]
Valuation allowance	723	441
New Zealand
Income Tax Examination [Line Items]
Valuation allowance	22,229	19,993
Other jurisdictions
Income Tax Examination [Line Items]
Valuation allowance	$ 108	$ 346