Income and Mining Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Royalty and other long-term debt	$ 0	$ 1,495
Deferred Tax Liabilities, Gross	0	1,495
Net operating loss carryforwards	282,776	267,944
Deferred Tax Assets, Mineral Properties	31,095	6,525
Property, plant, and equipment	12,562	13,161
Mining Royalty Tax	7,440	8,147
Capital loss carryforwards	1,784	15,404
Asset retirement obligation	44,413	39,262
Unrealized foreign currency loss and other	0	1,013
Accrued expenses	30,379	20,589
Tax credit carryforwards	16,167	26,594
Deferred Tax Assets, Other	3,914	0
Deferred Tax Assets, Gross	430,530	398,639
Valuation allowance	(444,989)	(430,053)
Deferred Tax Assets, Net of Valuation Allowance	(14,459)	(31,414)
Deferred Tax Liabilities, Net	$ 14,459	$ 32,909