Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2014

Pension Costs [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Benefit Plans

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2013			2014			2013			2014
	(Dollars in thousands)						(Dollars in thousands)
Service cost	$	489		$	473		$	978		$	946
Interest cost	1,985			2,169			3,970			4,338
Expected return on plan assets	(1,706		)	(1,938		)	(3,412		)	(3,876		)
Amortization of prior service cost	6			1			12			2
Net cost	$	774		$	705		$	1,548		$	1,410

Postretirement Costs [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Benefit Plans

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2013			2014			2013			2014
	(Dollars in thousands)						(Dollars in thousands)
Service cost	$	28		$	19		$	56		$	38
Interest cost	331			352			662			704
Curtailment loss	—			1,048			—			1,048
Amortization of prior service benefit	(50		)	(47		)	(100		)	(94		)
Net cost	$	309		$	1,372		$	618		$	1,696