Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2013

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 2013 are as follows:

	Amount
	(In thousands)
Balance at the beginning of the period	$	48,006
Additions charged to expense, net		13,041
Payments, net		(1,256	)
Balance at the end of the period	$	59,791
Amounts recognized in the Condensed Consolidated Balance Sheet at the end of the period:
Current liability	$	4,754
Noncurrent liability		55,037
Total	$	59,791