Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Sales | $ 411,433 | $ 205,334 | $ 1,103,902 | $ 720,246 | $ 542,549 | ||||||
| Costs applicable to sales | 124,410 | [1] | 106,837 | [1] | 467,313 | 419,976 | 331,042 | ||||
| Costs applicable to sales - temporarily suspended operations | [2] | 0 | 1,583 | 20,489 | |||||||
| Depreciation, depletion and amortization | 33,768 | 29,816 | 126,784 | 115,503 | 89,747 | ||||||
| General and administrative | 15,753 | 11,999 | 57,626 | 45,405 | 40,638 | ||||||
| Exploration and pre-development | 4,616 | 4,313 | 27,352 | 25,458 | 26,827 | ||||||
| Provision for closed operations and environmental matters | 1,297 | 790 | 7,867 | 6,843 | 7,575 | ||||||
| Write-down of property, plant and equipment | 0 | 14,574 | 0 | ||||||||
| Other operating expense (income), net | 5,236 | 868 | 6,546 | (47,204) | (4,461) | ||||||
| Care and maintenance costs | 3,246 | 3,306 | 14,005 | 14,346 | 18,683 | ||||||
| Total costs and expenses | 188,326 | 157,929 | 707,493 | 596,484 | 530,540 | ||||||
| Income from operations | 223,107 | 47,405 | 396,409 | 123,762 | 12,009 | ||||||
| Other expense: | |||||||||||
| Fair value adjustments, net | (5,945) | 3,388 | 8,332 | 3,541 | 1,735 | ||||||
| Foreign exchange (loss) gain, net | 498 | (367) | (6,019) | 8,063 | (4,145) | ||||||
| Other (expense) income, net | 3,549 | 942 | (930) | 4,169 | 5,465 | ||||||
| Interest expense | (5,656) | (11,392) | (40,991) | (49,331) | (43,065) | ||||||
| Total other expense: | (7,554) | (7,429) | (39,608) | (33,558) | (40,010) | ||||||
| Income (loss) before income and mining taxes | 215,553 | 39,976 | 356,801 | 90,204 | (28,001) | ||||||
| Income and mining tax provision | (50,900) | (14,304) | (98,742) | (39,969) | (12,246) | ||||||
| Net income from continuing operations | 164,653 | 25,672 | 258,059 | 50,235 | (40,247) | ||||||
| Income (loss) from discontinued operations, net of income and mining taxes | (183,681) | 3,200 | 63,653 | (14,433) | (43,970) | ||||||
| Net income | (19,028) | 28,872 | 321,712 | 35,802 | (84,217) | ||||||
| Preferred stock dividends | (132) | (138) | (552) | (552) | (552) | ||||||
| Net income (loss) applicable to common stockholders | (19,160) | 28,734 | 321,160 | 35,250 | (84,769) | ||||||
| Comprehensive income (loss): | |||||||||||
| Net Income (Loss) | (19,028) | 28,872 | 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 income (loss), net | (2,157) | 2,434 | 6,932 | (16,103) | 3,389 | ||||||
| Net income from continuing operations | 164,653 | 25,672 | 258,059 | 50,235 | (40,247) | ||||||
| Change in fair value of derivative contracts designated as hedge transactions and other | (2,157) | 2,434 | |||||||||
| Comprehensive income from continuing operations | 162,496 | 28,106 | 264,991 | 34,132 | (36,858) | ||||||
| Comprehensive income (loss) from discontinued operations | (183,681) | 3,200 | 63,653 | (14,433) | (43,970) | ||||||
| Comprehensive income (loss) | $ (21,185) | $ 31,306 | $ 328,644 | $ 19,699 | $ (80,828) | ||||||
| Basic: | |||||||||||
| Continuing operations | $ 0.25 | $ 0.04 | $ 0.39 | $ 0.08 | $ (0.07) | ||||||
| Discontinued operations | (0.28) | 0.01 | 0.1 | (0.02) | (0.07) | ||||||
| Diluted: | |||||||||||
| Continuing operations | 0.24 | 0.04 | 0.39 | 0.08 | (0.07) | ||||||
| Discontinued operations | (0.27) | 0.01 | 0.1 | (0.02) | (0.07) | ||||||
| Basic net income (loss) per common share after preferred dividends | (0.03) | 0.05 | 0.49 | 0.06 | (0.14) | ||||||
| Diluted net income (loss) per common share after preferred dividends | $ (0.03) | $ 0.05 | $ 0.49 | $ 0.06 | $ (0.14) | ||||||
| Weighted average number of common shares outstanding - basic | 670,392 | 632,047 | 651,965 | 620,848 | 605,668 | ||||||
| Weighted average number of common shares outstanding - diluted | 675,154 | 634,708 | 655,768 | 622,535 | 605,668 | ||||||
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- Definition Represents care and maintenance expenses. No definition available.
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- Definition The costs related to goods produced and sold during the reporting period, before depreciation, depletion, and amortization. No definition available.
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- Definition Costs Applicable To Sales Temporarily Suspended Operations No definition available.
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- Definition Depreciation Amortization And Depletion No definition available.
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- Definition Represents the amount of exploration and pre-development costs recorded during the period related to mining activities. No definition available.
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- Definition Net (loss) income from discontinued operations, net of taxes No definition available.
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- Definition Other Comprehensive Income (Loss) From Continuing Operations No definition available.
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- Definition Other Comprehensive Net (loss) Income from discontinued Operations No definition available.
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount, before recovery, of expense for known and estimated future costs arising from requirement to perform environmental remediation. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, before tax, of realized gain (loss) from foreign currency transaction. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of interest expense classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The aggregate amount of gains or losses resulting from nonoperating activities (for example, interest and dividend revenue, property, plant and equipment impairment loss, and so forth). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. No definition available.
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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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