Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Depreciation of plant and equipment is calculated using the straight-line method over the estimated useful lives or lease terms, generally as follows:

	Years
Buildings and improvements	10 to 45
Machinery and equipment	3 to 25
Leasehold improvements	Life of Lease

Property, plant and equipment consists of the following:

	December 31,
	2019		2018
Plant and Equipment	$	3,028,514	$	2,890,970
Coal Properties and Surface Lands	872,909		858,153
Airshafts	437,003		419,100
Mine Development	342,706		342,405
Advance Mining Royalties	327,048		327,543
Total Property, Plant and Equipment	5,008,180		4,838,171
Less: Accumulated Depreciation, Depletion and Amortization	2,916,015		2,731,643
Total Property, Plant and Equipment, Net	$	2,092,165	$	2,106,528