Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Change in Accrued Environmental Remediation and Related Costs

The table below presents a summary of the activity in our accrued environmental costs during the past three years.  The amount charged to expense is included in corporate expense on our Consolidated Statements of Operations.

	Years ended December 31,
	2016			2017			2018
	(In thousands)
Balance at the beginning of the year	$	113,133		$	116,658		$	111,909
Additions charged to expense, net		5,152			3,376			2,735
Payments, net		(1,627	)		(8,125	)		(16,433	)
Balance at the end of the year	$	116,658		$	111,909		$	98,211
Amounts recognized in the balance sheet:
Current liability	$	13,350		$	5,302		$	5,027
Noncurrent liability		103,308			106,607			93,184
Balance at the end of the year	$	116,658		$	111,909		$	98,211