Income and Mining Taxes - Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Examination [Line Items]
United States, Income (loss) before tax	$ (34,196)	$ 40,890	$ (16,702)
Foreign, Income (loss) before tax	37,832	21,782	(341,323)
Income (loss) before income and mining taxes	3,636	62,672	(358,025)
Tax (expense) benefit	$ 34,958	$ 37,045	$ (11,129)