Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2014			2015			2016
	(In thousands)
Balance at the beginning of the year	$	113,636		$	110,015		$	113,133
Additions charged to expense, net		6,485			4,370			5,152
Payments, net		(10,106	)		(1,252	)		(1,627	)
Balance at the end of the year	$	110,015		$	113,133		$	116,658
Amounts recognized in the balance sheet:
Current liability	$	6,984		$	8,668		$	13,350
Noncurrent liability		103,031			104,465			103,308
Balance at the end of the year	$	110,015		$	113,133		$	116,658