Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue		$ 177,235	$ 204,123	$ 364,533	$ 392,527
COSTS AND EXPENSES
Amortization		19,595	27,965	42,303	54,398
General and administrative		9,789	9,287	21,872	19,559
Pre-development, reclamation, and other		10,048	9,178	20,938	20,590
Total costs and expenses		181,989	202,388	385,376	389,190
OTHER INCOME (EXPENSE), NET
Fair value adjustments, net, pretax		(3,922)	(62,810)	6,639	(52,205)
Interest expense, net of capitalized interest		(6,912)	(5,170)	(14,301)	(9,738)
Other, net	[1]	(9,919)	313	(10,880)	2,050
Total other income (expense), net		(17,792)	(67,667)	(15,581)	(59,893)
Income (loss) before income and mining taxes		(22,546)	(65,932)	(36,424)	(56,556)
Income and mining tax (expense) benefit		(9,866)	(11,502)	(20,574)	(13,196)
NET INCOME (LOSS)		(32,412)	(77,434)	(56,998)	(69,752)
OTHER COMPREHENSIVE INCOME (LOSS), Net of Tax:
Unrealized gain (loss) on hedger, net of tax		12,842	34,245	(86)	29,027
Reclassification adjustments for realized (gain) loss on cash flow hedges		(1,224)	1,731	2,910	1,271
Other comprehensive income (loss)		14,066	32,514	(2,996)	27,756
COMPREHENSIVE INCOME (LOSS)		$ (18,346)	$ (44,920)	$ (59,994)	$ (41,996)
Basic EPS
Earnings Per Share, Basic		$ (0.10)	$ (0.28)	$ (0.18)	$ (0.26)
Diluted EPS
Earnings Per Share, Diluted		$ (0.10)	$ (0.28)	$ (0.18)	$ (0.26)
Gain on debt extinguishment		$ 2,961	$ 0	$ 2,961	$ 0
Product
COSTS AND EXPENSES
Costs applicable to sales	[2]	139,637	150,679	292,693	283,946
Mineral, Exploration
COSTS AND EXPENSES
Costs applicable to sales		$ 2,920	$ 5,279	$ 7,570	$ 10,697

[1] See Note 13 -- Additional Comprehensive Income (Loss) Detail for additional detail

[2] Excludes amortization.