Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2013			2014			2015
	(In thousands)
Balance at the beginning of the year	$	48,006		$	113,636		$	110,015
Additions charged to expense, net		68,929			6,485			4,370
Payments, net		(3,299	)		(10,106	)		(1,252	)
Balance at the end of the year	$	113,636		$	110,015		$	113,133
Amounts recognized in the balance sheet:
Current liability	$	4,859		$	6,984		$	8,668
Noncurrent liability		108,777			103,031			104,465
Balance at the end of the year	$	113,636		$	110,015		$	113,133