Property, Plant, and Equipment, net (Tables)

3 Months Ended

Mar. 31, 2020

Property Plant And Equipment [Abstract]

Schedule of Property, Plant, and Equipment

At March 31, 2020 and December 31, 2019, property, plant, and equipment consisted of the following:

	March 31, 2020			December 31, 2019
	(in thousands)
Land and improvements	$	225,107		$	230,300
Mineral rights properties		664,437			677,238
Machinery and equipment		1,315,919			1,338,411
Buildings and improvements		322,468			327,314
Railroad equipment		59,917			59,761
Furniture, fixtures, and other		5,148			5,382
Assets under construction		102,079			103,715
		2,695,075			2,742,121
Accumulated depletion and depreciation		(1,312,827	)		(1,322,139	)
Property, plant, and equipment, net	$	1,382,248		$	1,419,982