Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Sales	$ 1,423,019	$ 929,925	$ 720,227
Cost of sales and other direct production costs	640,799	548,245	458,504
Depreciation, depletion and amortization	160,017	183,470	148,774
Total cost of sales	800,816	731,715	607,278
Gross profit	622,203	198,210	112,949
Other operating expenses:
General and administrative	57,626	45,405	42,722
Exploration and pre-development	27,745	27,321	32,512
Ramp-up and suspension costs	14,005	43,307	76,252
Provision for closed operations and environmental matters	7,867	6,843	7,575
Write-down of property, plant and equipment	0	14,574	0
Other operating (income) expense, net	165	(45,516)	(1,438)
Total other operating expenses	107,408	91,934	157,623
Income (loss) from operations	514,795	106,276	(44,674)
Other expense:
Fair value adjustments, net	12,455	(2,204)	2,925
Foreign exchange (loss) gain, net	(5,764)	7,552	(3,810)
Other income	(726)	4,426	5,883
Interest expense	(41,581)	(49,834)	(43,319)
Total other expense:	(35,616)	(40,060)	(38,321)
Income (loss) before income and mining taxes	479,179	66,216	(82,995)
Income and mining tax provision	(157,467)	(30,414)	(1,222)
Net income (loss)	321,712	35,802	(84,217)
Preferred stock dividends	(552)	(552)	(552)
Net income (loss) applicable to common stockholders	321,160	35,250	(84,769)
Comprehensive income (loss):
Net Income (Loss)	321,712	35,802	(84,217)
Unrealized (loss) gain and amortization of prior service on pension plans	11,421	(8,389)	(1,157)
Unrealized (loss) gain on derivative contracts designated as hedge transactions	(4,489)	(7,714)	4,546
Total change in accumulated other comprehensive (loss) income, net	6,932	(16,103)	3,389
Comprehensive income (loss)	$ 328,644	$ 19,699	$ (80,828)
Basic income (loss) common share after preferred dividends	$ 0.49	$ 0.06	$ (0.14)
Diluted income (loss) per common share after preferred dividends	$ 0.49	$ 0.06	$ (0.14)
Weighted average number of common shares outstanding - basic	651,965	620,848	605,668
Weighted average number of common shares outstanding - diluted	655,768	622,535	605,668