Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 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 three months of 2018 are as follows:

	Amount
	(In thousands)
Balance at the beginning of the period	$	111,909
Additions charged to expense, net		4,162
Payments, net		(313	)
Balance at the end of the period	$	115,758
Amounts recognized in the Condensed Consolidated
Balance Sheet at the end of the period:
Current liability	$	18,252
Noncurrent liability		97,506
Balance at the end of the period	$	115,758