Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

(In thousands)	December 31, 2016			December 31, 2015
Machinery and equipment	$	2,000,512		$	1,879,890
Buildings and improvements	328,251			320,808
Land improvements	47,844			46,843
Office and other equipment	40,051			34,903
Land	7,266			7,266
Construction in progress	103,429			88,964
	$	2,527,353		$	2,378,674
Less accumulated depreciation and amortization	(1,582,025		)	(1,512,136		)
	$	945,328		$	866,538