Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018		2017
Plant and Equipment	$	2,890,970	$	2,757,062
Coal Properties and Surface Lands	858,153		857,031
Airshafts	419,100		392,266
Mine Development	342,405		344,139
Advance Mining Royalties	327,543		325,855
Total Property, Plant and Equipment	4,838,171		4,676,353
Less: Accumulated Depreciation, Depletion and Amortization	2,731,643		2,554,056
Total Property, Plant and Equipment, Net	$	2,106,528	$	2,122,297