Income and Mining Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
U.S. federal statutory tax rate	$ (143,428)	$ (26,534)	$ 14,376
State income and mining taxes, net of federal benefit	(37,331)	(11,313)	(1,468)
Change in valuation allowance	208,938	4,011	(30,242)
Uncertain tax positions	(28,820)	0	0
Subpart F income	(32)	(1,345)	(758)
Percentage depletion	21,092	6,974	5,649
Equity compensation	1,321	(1,205)	(780)
Other nondeductible items	(2,185)	(769)	(1,502)
Effect of tax rate changes	0	0	(1,659)
Income and mining tax (expense) benefit	$ (96,666)	$ (67,450)	$ (35,156)
Percent
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State income and mining taxes, net of federal benefit	5.50%	9.00%	(2.20%)
Change in valuation allowance	(30.60%)	(3.20%)	(44.20%)
Subpart F income	0.00%	1.10%	(1.10%)
Percentage depletion	(3.10%)	(5.50%)	8.30%
Equity compensation	(0.20%)	1.00%	(1.10%)
Other nondeductible items	0.30%	0.60%	(2.20%)
Effect of tax rate changes	0.00%	0.00%	(2.40%)
Income and mining tax (expense) benefit	14.20%	53.40%	(51.40%)
Mexico
Amount
Foreign tax rate differences	$ (30,341)	$ (11,253)	$ (5,848)
Foreign permanent differences	1,893	(1,384)	(1,190)
Mining taxes, net of income tax benefit	(27,276)	(8,865)	(6,513)
Change in valuation allowance	4,520	0	0
Foreign withholding taxes	(10,821)	(6,900)	0
Foreign exchange rates	(38,893)	1,434	1,172
Foreign inflation and indexing	5,724	2,230	2,858
Sale of non-core assets	0	0	(1,322)
Enactment of 1% increase in Mexico special mining duty tax	0	(1,696)	0
Other, net	$ 2,967	$ (175)	$ (547)
Percent
Foreign tax rate differences	4.40%	8.90%	(8.60%)
Foreign permanent differences	(0.30%)	1.10%	(1.70%)
Mining taxes, net of income tax benefit	4.00%	7.00%	(9.50%)
Change in valuation allowance	(0.70%)	0.00%	0.00%
Foreign withholding taxes	1.60%	5.50%	0.00%
Foreign exchange rates	5.70%	(1.10%)	1.70%
Foreign inflation and indexing	(0.80%)	(1.80%)	4.20%
Uncertain tax positions	4.20%	0.00%	0.00%
Sale of non-core assets	0.00%	0.00%	(1.90%)
Enactment of 1% increase in Mexico special mining duty tax	0.00%	1.30%	0.00%
Other, net	(0.40%)	0.10%	(0.80%)
Canada
Amount
Foreign tax rate differences	$ (2,954)	$ (2,434)	$ (2,015)
Provincial tax	5,907	4,868	4,029
Canadian flow through shares permanent	(3,802)	(7,246)	(3,448)
Change in valuation allowance	(9,481)	(3,746)	(5,986)
Foreign withholding taxes	(3,460)	(1,523)	(848)
Other, net	$ (3,427)	$ 40	$ 369
Percent
Foreign tax rate differences	0.40%	1.90%	(3.00%)
Provincial tax	(0.90%)	(3.90%)	5.90%
Canadian flow through shares permanent	0.60%	5.70%	(5.00%)
Change in valuation allowance	1.40%	3.00%	(8.80%)
Foreign withholding taxes	0.50%	1.20%	(1.20%)
Other, net	0.50%	0.00%	0.50%
Foreign Tax Jurisdiction, Other
Amount
Foreign tax rate differences	$ (420)	$ (456)	$ (117)
Percent
Foreign tax rate differences	0.10%	0.40%	(0.20%)
United States
Amount
Other, net	$ (6,357)	$ (163)	$ 634
Percent
Other, net	1.00%	0.10%	0.90%