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Property, Plant and Equipment
 3 Months Ended
Mar. 31, 2026
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
NOTE 11—PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment consisted of the following:
March 31,
2026		December 31,
2025
Plant and Equipment$4,979,427 $4,876,926 
Coal Properties and Surface Lands2,244,359 2,241,915 
Airshafts608,183 591,146 
Mine Development690,337 690,845 
Advance Mining Royalties330,516 329,970 
Total Property, Plant and Equipment8,852,822 8,730,802 
Less: Accumulated Depreciation, Depletion and Amortization4,477,329 4,343,920 
Total Property, Plant and Equipment—Net$4,375,493 $4,386,882 
As of March 31, 2026 and December 31, 2025, property, plant and equipment included gross assets under finance leases of $151,759 and $71,462, respectively. Accumulated amortization for finance leases was $20,485 and $15,230 at March 31, 2026 and December 31, 2025, respectively. Amortization expense for assets under finance leases was $5,898 and $3,075 for the three months ended March 31, 2026 and 2025, respectively, and is included in Depreciation, Depletion and Amortization in the accompanying Condensed Consolidated Statements of Income (Loss).