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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net includes the following:
 December 31
 20242023
Coal lands and real estate$70,766 $58,353 
Mineral interests69,148 68,150 
Plant and equipment317,933 325,655 
Property, plant and equipment, at cost457,847 452,158 
Less allowances for depreciation, depletion, amortization and impairment
198,390 228,256 
 $259,457 $223,902 
Total depreciation, depletion and amortization expense on property, plant and equipment was $24.1 million and $26.4 million during 2024 and 2023, respectively.
During 2023, we recorded a non-cash, long-lived asset impairment charge of $65.9 million. See Note 9 for further discussion of the impairment charge.