HELD FOR SALE AND DISCONTINUED OPERATIONS - Consolidated Balance Sheets (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Assets held for sale: | |||||
| Cash and cash equivalents | $ 634,086 | $ 524,750 | |||
| Inventories | 522,949 | 488,800 | |||
| Mineral properties, plant and equipment, net | 1,885,346 | 1,835,722 | |||
| Total current assets | 3,668,884 | 1,287,121 | |||
| Inventories | 327,075 | 328,923 | |||
| Other non-current assets | 60,862 | 62,279 | |||
| Total assets | [1] | 5,946,734 | 6,093,898 | ||
| Liabilities held for sale: | |||||
| Accounts payable | 36,604 | 29,201 | |||
| Accrued liabilities and other | 228,370 | 197,353 | |||
| Reclamation and remediation liabilities | 7,895 | 8,814 | |||
| Finance lease liabilities | 91 | 1,745 | |||
| Current portion of debt | 0 | 229,640 | |||
| Other current liabilities | (236) | 2,751 | |||
| Total current liabilities | 688,673 | 618,357 | |||
| Reclamation and remediation liabilities | 396,826 | 390,209 | |||
| Deferred income tax liabilities | 206,995 | 198,527 | |||
| Other non-current liabilities | 52,109 | 39,327 | |||
| Total liabilities | [1] | 1,517,971 | 1,779,644 | ||
| Non-controlling interest | 797,779 | 806,481 | |||
| Trade and other receivables | 138,633 | 136,721 | |||
| Variable Interest Entity, Primary Beneficiary | |||||
| Assets held for sale: | |||||
| Cash and cash equivalents | 17,000 | 9,200 | |||
| Mineral properties, plant and equipment, net | 841,900 | 811,300 | |||
| Other non-current assets | 5,200 | 4,400 | |||
| Total assets | 900,400 | 858,800 | |||
| Liabilities held for sale: | |||||
| Accounts payable | 3,600 | 3,800 | |||
| Accrued liabilities and other | 3,100 | 4,100 | |||
| Deferred income tax liabilities | 71,000 | 73,500 | |||
| Other non-current liabilities | 66,000 | 51,400 | |||
| Total liabilities | 143,700 | 132,800 | |||
| Trade and other receivables | 2,000 | 3,300 | |||
| Discontinued Operations | |||||
| Assets held for sale: | |||||
| Cash and cash equivalents | 3,662 | 10,085 | |||
| Inventories | 300,853 | 27,521 | |||
| Prepaids and other current assets | 8,206 | 4,617 | |||
| Mineral properties, plant and equipment, net | 1,947,232 | 0 | |||
| Total current assets | 2,259,953 | 42,223 | |||
| Mineral properties, plant and equipment, net | 0 | 2,297,532 | |||
| Inventories | 0 | 274,919 | |||
| Other non-current assets | 0 | 2,545 | |||
| Total assets | 2,259,953 | 2,617,219 | |||
| Liabilities held for sale: | |||||
| Accounts payable | 9,958 | 11,653 | |||
| Accrued liabilities and other | 10,022 | 11,935 | |||
| Reclamation and remediation liabilities | 230,042 | 25,379 | |||
| Finance lease liabilities | 80,120 | 5,012 | |||
| Deferred income tax liabilities | 72,085 | 0 | |||
| Other current liabilities | 2,486 | 0 | |||
| Total current liabilities | 415,713 | 64,979 | |||
| Finance lease liabilities | 0 | 76,344 | |||
| Reclamation and remediation liabilities | 0 | 207,081 | |||
| Deferred income tax liabilities | 0 | 88,961 | |||
| Other non-current liabilities | 0 | 3,063 | |||
| Total liabilities | 415,713 | 440,428 | |||
| Non-controlling interest | 352,803 | 359,210 | |||
| Discontinued Operations | Variable Interest Entity, Primary Beneficiary | |||||
| Assets held for sale: | |||||
| Cash and cash equivalents | 1,300 | 6,200 | |||
| Inventories | 300,800 | 27,500 | |||
| Mineral properties, plant and equipment, net | 1,942,000 | 2,294,600 | |||
| Inventories | 0 | 274,900 | |||
| Other non-current assets | 0 | 300 | |||
| Total assets | 2,250,700 | 2,608,700 | |||
| Liabilities held for sale: | |||||
| Accounts payable | 9,800 | 11,500 | |||
| Accrued liabilities and other | 26,100 | 25,700 | |||
| Reclamation and remediation liabilities | 230,000 | 25,400 | |||
| Finance lease liabilities | 75,100 | 0 | |||
| Finance lease liabilities | 0 | 76,300 | |||
| Reclamation and remediation liabilities | 0 | 207,100 | |||
| Other non-current liabilities | 0 | 2,600 | |||
| Total liabilities | 413,100 | 437,500 | |||
| Trade and other receivables | 100 | 0 | |||
| Deferred income tax liabilities, current | 72,100 | 0 | |||
| Deferred income tax liabilities, non-current | 0 | 88,900 | |||
| Nonrelated Party | |||||
| Assets held for sale: | |||||
| Prepaids and other current assets | 49,137 | 30,299 | |||
| Liabilities held for sale: | |||||
| Current portion of debt | 0 | 229,640 | |||
| Nonrelated Party | Variable Interest Entity, Primary Beneficiary | |||||
| Assets held for sale: | |||||
| Prepaids and other current assets | 10,400 | 7,100 | |||
| Nonrelated Party | Discontinued Operations | Variable Interest Entity, Primary Beneficiary | |||||
| Assets held for sale: | |||||
| Prepaids and other current assets | 6,500 | 5,200 | |||
| Related Party | |||||
| Assets held for sale: | |||||
| Prepaids and other current assets | 23,856 | 23,549 | |||
| Liabilities held for sale: | |||||
| Current portion of debt | $ 11,000 | ||||
| Related Party | Variable Interest Entity, Primary Beneficiary | |||||
| Assets held for sale: | |||||
| Prepaids and other current assets | 23,500 | ||||
| Related Party | Discontinued Operations | |||||
| Liabilities held for sale: | |||||
| Current portion of debt | $ 11,000 | $ 11,000 | |||
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- Definition Accrued Liabilities And Other Liabilities, Current No definition available.
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- Definition Deferred Income Tax Liabilities, Current No definition available.
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- Definition Deferred Income Tax Liabilities, Non-Current No definition available.
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- Definition Property, Plant, And Equipment And Finance Lease Right-of-Use Asset, After Accumulated Depreciation and Amortization Including Mineral Properties, Accumulated Depletion No definition available.
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- Definition Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Including Mineral Properties, Accumulated Depletion, Current No definition available.
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of asset recognized for present right to economic benefit, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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