Pension Plan and Postretirement Benefits Other Than Pension (Tables)

9 Months Ended

Sep. 30, 2011

Pension Plan and Postretirement Benefits Other Than Pension

Components of net periodic pension and other postretirement costs

	Pension Benefits					Other Postretirement Benefits		Pension Benefits				Other Postretirement Benefits
	Three months ended September 30,					Three months ended September 30,		Nine months ended September 30,				Nine months ended September 30,
	2011			2010		2011	2010	2011		2010		2011	2010
	(in thousands)							(in thousands)
Components of net periodic benefit cost:
Service cost	$	1,775		1,535		139	111	5,326		4,605		418	332
Interest cost	1,799			1,649		100	91	5,397		4,947		301	273
Expected return on plan assets	(2,191		)	(1,875	)	—	—	(6,573	)	(5,624	)	—	—
Actuarial loss amortization	451			404		—	—	1,353		1,212		—	—
Prior service cost amortization	139			139		14	11	417		417		42	34
Transition obligation amortization	1			1		—	—	3		3		—	—
Total	$	1,974		1,853		253	213	5,923		5,560		761	639