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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment consists of the following:
 December 31,
 20242023
Plant and Equipment$3,633,741 $3,458,655 
Coal Properties and Surface Lands913,819 906,343 
Airshafts521,334 492,806 
Mine Development366,260 366,260 
Advance Mining Royalties328,927 328,340 
Total Property, Plant and Equipment5,764,081 5,552,404 
Less: Accumulated Depreciation, Depletion and Amortization3,842,382 3,649,281 
Total Property, Plant and Equipment - Net$1,921,699 $1,903,123 
As of December 31, 2024 and 2023, property, plant and equipment includes gross assets under finance leases of $40,804 and $44,622, respectively. Accumulated amortization for finance leases was $16,929 and $31,873 at December 31, 2024 and 2023, respectively. Amortization expense for assets under finance leases approximated $9,814, $25,400 and $24,206 for the years ended December 31, 2024, 2023 and 2022, respectively, and is included in Depreciation, Depletion and Amortization in the accompanying Consolidated Statements of Income. See Note 14 - Leases for further discussion of finance leases.