Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Depreciation is calculated using the straight-line method typically over the following range of estimated useful lives of the assets:

Asset	Useful Life
Buildings	15 to 40 years
Machinery and equipment	3 to 20 years
Leasehold improvements	Over the shorter of their estimated useful lives or the terms of the applicable lease agreements

Property, plant and equipment as of December 31, 2017 and 2016 consisted of the following:

	December 31
	2017			2016
	(In thousands)
Land	$	175,243		$	174,323
Buildings	677,827			673,687
Leasehold improvements	83,366			82,284
Machinery and equipment	1,867,168			1,921,436
Construction in progress	29,952			24,362
	2,833,556			2,876,092
Less accumulated depreciation	(1,739,492		)	(1,712,241		)
Total	$	1,094,064		$	1,163,851