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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2023
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
 20232022
Coal lands and real estate$58,353 $60,277 
Mineral interests68,150 31,436 
Plant and equipment325,655 290,511 
Property, plant and equipment, at cost452,158 382,224 
Less allowances for depreciation, depletion, amortization and impairment
228,256 164,272 
 $223,902 $217,952 
Total depreciation, depletion and amortization expense on property, plant and equipment was $26.4 million and $23.1 million during 2023 and 2022, respectively.
During the fourth quarter of 2023, the Company recorded a non-cash, long-lived asset impairment charge of $65.9 million. See Note 9 for further discussion of the impairment charge.