Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Table

Depreciation and amortization are provided for using principally the straight-line method over the estimated useful lives of the assets as follows:

Buildings	20-30 years
Machinery	8-12 years
Other equipment	3-5 years

The components of property, plant and equipment at December 31 were as follows (in thousands):

	2017			2016
Land	$	2,471		$	2,404
Buildings	90,683			88,201
Machinery and other equipment	226,320			221,325
Computer equipment	77,508			70,110
Software	62,387			54,451
	459,369			436,491
Accumulated depreciation	(316,834		)	(295,173		)
	$	142,535		$	141,318