Income and Mining Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income and mining tax (expense) benefit at statutory rate	$ 13,249	$ (764)	$ (13,161)
State tax provision from continuing operations	2,871	2,009	(152)
Change in valuation allowance	(36,670)	(28,615)	(17,522)
Percentage depletion	3,538	4,968	5,056
Uncertain tax positions	655	920	2,321
U.S. and foreign permanent differences	365	4,105	3,844
Foreign exchange rates	(145)	(384)	1,390
Foreign inflation and indexing	2,897	(1,087)	684
Foreign tax rate differences	(4,994)	(4,901)	(3,971)
Mining, foreign withholding, and other taxes	(11,070)	(12,599)	(17,457)
Sale of non-core assets	15,447	0	0
Other, net	(801)	1,390	1,923
Income and mining tax benefit (expense)	$ 14,658	$ 34,958	$ 37,045