Benefit Plans

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Benefit Plans

Benefit Plans

The components of our consolidated net pension costs are set forth in the following table:

	Predecessor			Successor			Predecessor			Successor
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2015			2016			2015			2016
	(Dollars in thousands)						(Dollars in thousands)
Service cost	$	506		$	508		$	1,333		$	1,016
Interest cost	1,526			1,498			3,052			2,996
Expected return on plan assets	(1,354		)	(1,310		)	(2,708		)	(2,620		)
Amortization of prior service cost	1			—			2			—
Net cost	$	679		$	696		$	1,679		$	1,392

The components of our consolidated net postretirement costs are set forth in the following table: 

	Predecessor			Successor		Predecessor			Successor
	For the Three Months Ended June 30,					For the Six Months Ended June 30,
	2015			2016		2015			2016
	(Dollars in thousands)					(Dollars in thousands)
Service cost	$	4		$	1	$	8		$	2
Interest cost	315			272		630			543
Amortization of prior service cost	(43		)	—		(86		)	—
Net cost	$	276		$	273	$	552		$	545