Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment

Schedule of property, plant and equipment

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