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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment consists of the following:
 December 31,
 20222021
Plant and Equipment$3,330,755 $3,209,232 
Coal Properties and Surface Lands898,628 881,551 
Airshafts481,090 473,866 
Mine Development366,241 357,479 
Advance Mining Royalties331,863 328,677 
Total Property, Plant and Equipment5,408,577 5,250,805 
Less: Accumulated Depreciation, Depletion and Amortization3,448,495 3,272,255 
Total Property, Plant and Equipment - Net$1,960,082 $1,978,550 
As of December 31, 2022 and 2021, property, plant and equipment includes gross assets under finance leases of $90,516 and $80,232, respectively. Accumulated amortization for finance leases was $54,028 and $34,036 at December 31, 2022 and 2021, respectively. Amortization expense for assets under finance leases approximated $24,206, $27,846 and $24,066 for the years ended December 31, 2022, 2021 and 2020, 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.