Other Accrued Liabilities (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Other Liabilities Disclosure [Abstract] | ||
| Subsidence Liability | $ 117,386 | $ 113,352 |
| Accrued Compensation and Benefits | 87,313 | 73,783 |
| Accrued Other Taxes | 42,721 | 53,038 |
| Other | 73,942 | 63,951 |
| Current Portion of Long-Term Liabilities: | ||
| Asset Retirement Obligations | 38,738 | 38,738 |
| Pneumoconiosis Benefits | 23,886 | 24,539 |
| Workers' Compensation | 18,896 | 18,241 |
| Postretirement Benefits Other than Pensions | 18,370 | 18,696 |
| Total Other Accrued Liabilities | $ 421,252 | $ 404,338 |
| X | ||||||||||
- Definition Represents current medical and disability for employee related liabilities. No definition available.
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- Definition Represents current liability for other postretirement defined benefit plan. No definition available.
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- Definition Represents current accrued subsidence liability. No definition available.
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- 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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| X | ||||||||||
- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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