Income and Mining Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Royalty and other long-term debt	$ 5,529	$ 0
Deferred Tax Liabilities, Gross	5,529	0
Net operating loss carryforwards	304,244	302,114
Deferred Tax Assets, Mineral Properties	50,824	44,244
Property, plant, and equipment	0	12,068
Mining Royalty Tax	8,314	7,345
Capital loss carryforwards	16,910	5,167
Asset retirement obligation	49,306	45,155
Accrued expenses	18,117	25,321
Tax credit carryforwards	13,620	14,506
Deferred Tax Assets, Other	30,612	11,566
Deferred Tax Assets, Gross	491,947	467,486
Valuation allowance	(490,044)	(479,846)
Deferred Tax Assets, Net of Valuation Allowance	1,903	(12,360)
Deferred Tax Liabilities, Net	$ 3,626	$ 12,360