Income and Mining Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income and mining tax (expense) benefit at statutory rate	$ 14,376	$ 13,249	$ (764)
State tax provision from continuing operations	4,859	2,871	2,009
Change in valuation allowance	(36,778)	(36,670)	(28,615)
Percentage depletion	5,649	3,538	4,968
Uncertain tax positions	6	655	920
U.S. and foreign permanent differences	(3,056)	365	4,105
Foreign exchange rates	1,179	(145)	(384)
Foreign inflation and indexing	3,077	2,897	(1,087)
Foreign tax rate differences	(3,911)	(4,994)	(4,901)
Mining, foreign withholding, and other taxes	(18,265)	(11,070)	(12,599)
Sale of non-core assets	(1,322)	15,447	0
Other, net	(970)	(801)	1,390
Income and mining tax benefit (expense)	$ 35,156	$ 14,658	$ 34,958