Income and Mining Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Royalty and other long-term debt	$ 0	$ 0
Deferred Tax Liabilities, Gross	0	0
Net operating loss carryforwards	302,114	282,776
Deferred Tax Assets, Mineral Properties	44,244	31,095
Property, plant, and equipment	12,068	12,562
Mining Royalty Tax	7,345	7,440
Capital loss carryforwards	5,167	1,784
Asset retirement obligation	45,155	44,413
Unrealized foreign currency loss and other	0	0
Accrued expenses	25,321	30,379
Tax credit carryforwards	14,506	16,167
Deferred Tax Assets, Other	11,566	3,914
Deferred Tax Assets, Gross	467,486	430,530
Valuation allowance	(479,846)	(444,989)
Deferred Tax Assets, Net of Valuation Allowance	(12,360)	(14,459)
Deferred Tax Liabilities, Net	$ 12,360	$ 14,459