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Coal Workers' Pneumoconiosis and Workers' Compensation - Schedule of Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 10,932
2025 10,958
2026 11,220
2027 11,246
2028 11,575
Year 2029-2033 60,729
CWP Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 15,071
2025 14,305
2026 13,636
2027 12,909
2028 12,440
Year 2029-2033 59,950
Actuarial Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 9,009
2025 8,987
2026 9,200
2027 9,175
2028 9,452
Year 2029-2033 49,293
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 1,923
2025 1,971
2026 2,020
2027 2,071
2028 2,123
Year 2029-2033 $ 11,436