Property, Plant and Equipment

9 Months Ended

Sep. 30, 2018

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

(8) Property, Plant and Equipment

Property, plant and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation is recorded using the straight-line method over the assets’ estimated useful lives. Our depreciation expense related to property, plant and equipment for the nine months ended September 30, 2018 and 2017 was $21.4 million and $19.0 million, respectively. Normal repairs and maintenance to property, plant and equipment are expensed as incurred. When property or equipment is retired or sold, the net book value of the asset, reduced by any proceeds, is charged to gain or loss on the disposal of property, plant and equipment and is included in rental, selling and general expenses in the condensed consolidated statements of operations.

Property, plant and equipment at September 30, 2018 and December 31, 2017 consisted of the following:

	Residual Value as Percentage of Original Cost		Estimated Useful Life in Years	September 30, 2018			December31, 2017
				(In thousands)
Land				$	2,954		$	2,970
Vehicles and machinery	0 - 55%		5 - 30		152,782			151,937
Buildings and improvements (1)	0 - 25		3 - 30		26,779			25,079
Furniture, office and computer equipment		—	3 - 10		75,966			73,416
Property, plant and equipment					258,481			253,402
Accumulated depreciation					(102,860	)		(96,098	)
Property, plant and equipment, net				$	155,621		$	157,304

(1) Improvements made to leased properties are depreciated over the lesser of the estimated remaining life or the remaining term of the respective lease.

As of September 30, 2018 and December 31, 2017, we had $40.4 million and $39.5 million, respectively, of capitalized software, net of accumulated depreciation, included in property, plant and equipment.