Property, Plant and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment

Property, Plant and Equipment

Note 6: Property, Plant and Equipment

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

December 31,	2019		2018
(in thousands)
Land	$	18,945	$	21,159
Buildings and leasehold improvements		114,318		140,269
Operating equipment		1,194,071		1,429,906
Computer software		25,247		24,619
Furniture and fixtures		7,086		7,606
Vehicles		553,968		528,250
Gross property, plant and equipment		1,913,635		2,151,809
Less: accumulated depreciation		(1,396,908)		(1,633,827)
Net property, plant and equipment	$	516,727	$	517,982

Depreciation expense was $172.6 million in 2019, $166.2 million in 2018, and $166.9 million in 2017, and includes amounts recorded as costs of revenues. There were no capital leases outstanding as of December 31, 2019 and December 31, 2018. The Company had accounts payable for purchases of property and equipment of $6.8 million as of December 31, 2019, $14.8 million as of December 31, 2018, and $7.1 million as of December 31, 2017. The Company transferred inventory to property, plant and equipment totaling $20.8 million in 2019 and $23.1 million in 2018.