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v3.26.1

Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Restricted Cash Deposits | Amounts included in restricted cash provide collateral to secure the following obligations:
| June 30, 2026 |  | December 31, 2025
Workers’ compensation and black lung obligations | $ | 118,045 |  |  | $ | 117,150 |
Reclamation-related obligations | 1,294 |  |  | 959 |
Financial payments and other performance obligations | 8,880 |  |  | 8,802 |
Total long-term restricted cash | $ | 128,219 |  |  | $ | 126,911 |
Schedule of Restricted Investments and Deposit Assets | Amounts included in restricted investments provide collateral to secure the following obligations:
| June 30, 2026 |  | December 31, 2025
Workers’ compensation obligations | $ | 3,168 |  |  | $ | 3,172 |
Reclamation-related obligations | 27,268 |  |  | 27,238 |
Financial payments and other performance obligations | 4,017 |  |  | 3,946 |
Total long-term restricted investments (1) | $ | 34,453 |  |  | $ | 34,356 |
(1) Classified as long-term trading securities as of June 30, 2026 and December 31, 2025. Amounts included in deposits provide collateral to secure the following obligations:
| June 30, 2026 |  | December 31, 2025
Workers’ compensation obligations | $ | 4,108 |  |  | $ | 4,108 |
Other operating agreements | 683 |  |  | 684 |
Total deposits | 4,791 |  |  | 4,792 |
Less current portion | (29) |  |  | — |
Total deposits, net of current portion (1) | $ | 4,762 |  |  | $ | 4,792 |
(1) Included within Other non-current assets on the Company’s Condensed Consolidated Balance Sheets.

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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References No definition available. + Details
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- Definition Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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