Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2018 and 2017 (in thousands):

	2018			2017
Machinery and equipment	$	151,339		$	138,592
Vehicles	58,205			55,648
Furniture and fixtures	20,655			20,195
Computer hardware/software	98,415			95,716
Land, buildings and leasehold improvements	97,937			92,145
Construction in progress	14,443			6,779
	440,994			409,075
Accumulated depreciation and amortization	(306,643		)	(281,919		)
	$	134,351		$	127,156