Pension Benefit and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the periods indicated are:

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	Three Months Ended						Three Months Ended
Change in benefit obligation:	March 31, 2013			March 31, 2012			March 31, 2013			March 31, 2012
Service cost	$	1,254		$	1,189		$	170		$	182
Interest cost	2,061			2,118			71			88
Expected return on plan assets	(2,716		)	(2,408		)	—			—
Amortization of prior service cost	93			116			(58		)	(113		)
Amortization of net loss	1,476			1,349			83			115
Special termination benefit	—			—			—			2,300
Net periodic benefit cost	$	2,168		$	2,364		$	266		$	2,572