Pension Plan and Postretirement Benefits Other Than Pension (Tables)

3 Months Ended

Mar. 31, 2013

Pension Plan and Postretirement Benefits Other Than Pension

Schedule of components of net periodic pension and other postretirement costs related to the plans

	Pension Benefits					Other Postretirement Benefits
	Three months ended					Three months ended
	March 31,					March 31,
	2013			2012		2013	2012
	(in thousands)
Components of net periodic benefit cost:
Service cost	$	2,950		2,209		197	173
Interest cost	1,952			1,812		90	100
Expected return on plan assets	(2,704		)	(2,127	)	—	—
Actuarial loss amortization	1,250			1,021		—	3
Prior service cost amortization	139			139		14	14
Transition obligation amortization	1			1		—	—
Total (1)	$	3,588		3,055		301	290

(1) Net periodic pension benefit cost related to discontinued operations and included in the table above was $196 thousand for the three months ended March 31, 2012. Net periodic cost for the postretirement medical plan related to discontinued operations and included in the table above was $3 thousand for the three months ended March 31, 2012.