Property, Plant and Equipment

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment

Property, Plant and Equipment

Note 7: Property, Plant and Equipment

Property, plant and equipment are presented at cost net of accumulated depreciation and consist of the following:

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

Depreciation expense was $72.7 million in 2021, $95.3 million in 2020, and $172.6 million in 2019. The Company had accounts payable for purchases of property and equipment of $4.3 million as of December 31, 2021 and $3.9 million as of December 31, 2020. The Company transferred inventory to property, plant and equipment totaling $11.1 million in 2021 and $8.6 million in 2020.