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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Changes 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,
	2018				2019				2020
	(In thousands)
Balance at the beginning of the year	$	111,909			$	98,211			$	94,508
Additions charged (credited) to expense, net		2,735				(579	)			82
Payments, net		(16,433	)			(3,124	)			(1,174	)
Balance at the end of the year	$	98,211			$	94,508			$	93,416
Amounts recognized in the balance sheet:
Current liability	$	5,027			$	3,065			$	2,027
Noncurrent liability		93,184				91,443				91,389
Balance at the end of the year	$	98,211			$	94,508			$	93,416

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- Definition

Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature.

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