Income and Mining Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Tax (expense) benefit	$ 1,694	$ 12,786
Effective income tax rate	18.10%	(86.10%)
Unrecognized income tax liability	$ 100
Unrecognized tax benefits	0		$ 300
Income-tax related interest and penalties	$ 0		$ 400