Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Supplemental Disclosures of Cash Flow Information

	Year Ended December 31
	2018			2017			2016
	(In thousands)
Cash paid for interest and financing charges, net of capitalized interest	$	54,178		$	60,403		$	60,580
Net cash paid (received) for taxes	(335		)	(3,063		)	50,630
Non-cash additions to property, plant and equipment, including capital leases	17,088			8,879			4,748