Income and Mining Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Income Tax Examination [Line Items]
Valuation allowance	$ 303,518	$ 490,044
United States
Income Tax Examination [Line Items]
Valuation allowance	52,394	268,119
Canada
Income Tax Examination [Line Items]
Valuation allowance	216,711	200,319
Mexico
Income Tax Examination [Line Items]
Valuation allowance	12,594	408
New Zealand
Income Tax Examination [Line Items]
Valuation allowance	21,643	21,013
Other jurisdictions
Income Tax Examination [Line Items]
Valuation allowance	$ 176	$ 185