Employee benefit plans (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Employee Defined Benefit Plans

	Three months ended September 30,						Nine months ended September 30,
	2011			2012			2011			2012
	(In thousands)
Interest cost	$	690		$	627		$	2,081		$	1,898
Expected return on plan assets		(977	)		(914	)		(2,930	)		(2,743	)
Recognized actuarial losses		218			332			654			994
Total	$	(69	)	$	45		$	(195	)	$	149

Postretirement benefits—The components of net periodic postretirement benefits other than pension cost are presented in the table below.

	Three months ended September 30,						Nine months ended September 30,
	2011			2012			2011			2012
	(In thousands)
Interest cost	$	59		$	39		$	177		$	118
Amortization of prior service credit		(200	)		(175	)		(600	)		(524	)
Recognized actuarial gain		—			(24	)		—			(74	)
Total	$	(141	)	$	(160	)	$	(423	)	$	(480	)