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Coal Workers' Pneumoconiosis and Workers' Compensation - Schedule of Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2023 $ 11,220
2024 11,159
2025 11,189
2026 11,379
2027 11,437
Year 2028-2032 60,115
CWP Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 12,723
2024 12,520
2025 12,383
2026 12,061
2027 11,824
Year 2028-2032 58,328
Actuarial Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 9,393
2024 9,287
2025 9,270
2026 9,412
2027 9,421
Year 2028-2032 49,252
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 1,827
2024 1,872
2025 1,919
2026 1,967
2027 2,016
Year 2028-2032 $ 10,863