Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment

Schedule of property, plant and equipment

December 31,	2021		2020
(in thousands)
Land	$	18,180	$	19,474
Buildings and leasehold improvements		120,649		122,289
Operating equipment		606,089		645,576
Computer software		22,925		24,681
Furniture and fixtures		6,222		6,692
Vehicles		243,647		236,411
Gross property, plant and equipment		1,017,712		1,055,123
Less: accumulated depreciation		(763,304)		(790,712)
Net property, plant and equipment	$	254,408	$	264,411