Pension Benefits and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2015

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of net periodic benefit cost

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

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	Quarter Ended						Quarter Ended
Change in benefit obligation:	March 31, 2015			March 31, 2014			March 31, 2015		March 31, 2014
Service cost	$	—		$	—		$	150	$	160
Interest cost	1,839			2,018			75		83
Expected return on plan assets	(2,771		)	(3,227		)	—		—
Amortization of prior service cost	—			—			—		—
Amortization of net loss	413			183			—		31
Settlement charge	—			110			—		—
Net periodic benefit cost (income)	$	(519	)	$	(916	)	$	225	$	274