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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2022
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
 20222021
Coal lands and real estate$60,277 $52,011 
Mineral interests31,436 19,512 
Plant and equipment290,511 264,110 
Property, plant and equipment, at cost382,224 335,633 
Less allowances for depreciation, depletion and amortization164,272 142,466 
 $217,952 $193,167 
Total depreciation, depletion and amortization expense on property, plant and equipment was $23.1 million and $19.5 million during 2022 and 2021, respectively.