Other, Net - Summary of Pre-development, reclamation and other (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Other Income and Expenses [Abstract]
Accretion Expense, Including Asset Retirement Obligations	$ 3,463	$ 2,905
Other Operating Income (Expense), Net	818	881
Covid-19 Related Costs	972	3,005
Care and maintenance costs	6,159	6,921
Pre-development, reclamation, and other	$ 11,412	$ 13,712