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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, at cost | $ 452,158 | $ 452,158 | $ 382,224
Less allowances for depreciation, depletion, amortization and impairment | 228,256 | 228,256 | 164,272
Property, plant and equipment, net | 223,902 | 223,902 | 217,952
Depreciation, depletion and amortization |  | 26,400 | 23,100
Long-lived asset impairment charge | 65,900 | 65,887 | 3,939
Coal lands and real estate |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, at cost | 58,353 | 58,353 | 60,277
Mineral interests |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, at cost | 68,150 | 68,150 | 31,436
Plant and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, at cost | $ 325,655 | $ 325,655 | $ 290,511

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