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Coal Workers' Pneumoconiosis and Workers' Compensation - Schedule of Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 11,920
2026 11,756
2027 11,967
2028 12,347
2029 12,514
Year 2030-2034 66,319
CWP Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 16,389
2026 15,255
2027 14,211
2028 13,394
2029 12,808
Year 2030-2034 60,841
Actuarial Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 10,056
2026 9,845
2027 10,008
2028 10,339
2029 10,456
Year 2030-2034 55,231
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 1,864
2026 1,911
2027 1,959
2028 2,008
2029 2,058
Year 2030-2034 $ 11,088