Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Changes in Accrued Environmental Remediation and Related Costs

Changes in the accrued environmental remediation and related costs during the first six months of 2018 are as follows:

	Amount
	(In thousands)
Balance at the beginning of the period	$	111,909
Additions charged to expense, net		4,291
Payments, net		(739	)
Balance at the end of the period	$	115,461
Amounts recognized in the Condensed Consolidated
Balance Sheet at the end of the period:
Current liability	$	18,253
Noncurrent liability		97,208
Balance at the end of the period	$	115,461