Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue		$ 821,206	$ 785,636	$ 832,828
COSTS AND EXPENSES
Amortization		99,822	111,626	128,315
General and administrative		41,605	39,460	40,399
Pre-development, reclamation, and other		54,636	40,647	44,567
Total costs and expenses		859,921	824,887	775,989
OTHER INCOME (EXPENSE), NET
Fair value adjustments, net, pretax		3,384	(66,668)	(543)
Interest expense, net of capitalized interest		(29,099)	(23,861)	(16,451)
Other, net	[1]	(7,463)	66,331	(27,036)
Total other income (expense), net		(29,741)	(24,198)	(53,203)
Income (loss) before income and mining taxes		(68,456)	(63,449)	3,636
Income and mining tax (expense) benefit		(35,156)	(14,658)	(34,958)
NET INCOME (LOSS)		(103,612)	(78,107)	(31,322)
OTHER COMPREHENSIVE INCOME (LOSS), Net of Tax:
Unrealized gain (loss) on hedger, net of tax		(318)	37,445	22,783
Reclassification adjustments for realized (gain) loss on cash flow hedges		10,694	23,890	12,859
Other comprehensive income (loss)		(11,012)	13,555	9,924
COMPREHENSIVE INCOME (LOSS)		$ (114,624)	$ (64,552)	$ (21,398)
Basic EPS
Earnings Per Share, Basic		$ (0.30)	$ (0.28)	$ (0.13)
Diluted EPS
Earnings Per Share, Diluted		$ (0.30)	$ (0.28)	$ (0.13)
Gain on debt extinguishment		$ 3,437	$ 0	$ (9,173)
Product
COSTS AND EXPENSES
Costs applicable to sales	[2]	632,896	606,530	511,539
Mineral, Exploration
COSTS AND EXPENSES
Costs applicable to sales		$ 30,962	$ 26,624	$ 51,169

[1] See Note 15 -- Additional Comprehensive Income (Loss) Detail for additional detail

[2] Excludes amortization.