Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016 (in thousands):

	2017			2016
Machinery and equipment	$	138,592		$	133,455
Vehicles	55,648			54,165
Furniture and fixtures	20,195			21,513
Computer hardware/software	95,716			87,416
Land, buildings and leasehold improvements	92,145			90,215
Construction in progress	6,779			7,544
	409,075			394,308
Accumulated depreciation and amortization	(281,919		)	(266,357		)
	$	127,156		$	127,951