Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2016

Pension Costs

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Benefit Plans

	Predecessor			Successor
	For the Three Months Ended March 31, 2015			For the Three Months Ended March 31, 2016
	(Dollars in thousands)
Service cost	$	827		$	508
Interest cost	1,526			1,498
Expected return on plan assets	(1,354		)	(1,310		)
Amortization of prior service cost	1			—
Net cost	$	1,000		$	696

Postretirement Costs

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Benefit Plans

	Predecessor			Successor
	For the Three Months Ended March 31, 2015			For the Three Months Ended March 31, 2016
	(Dollars in thousands)
Service cost	$	4		$	1
Interest cost	315			272
Amortization of prior service benefit	(43		)	—
Net cost	$	276		$	273