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Benefit Plans
 9 Months Ended
Sep. 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
 
For the Period
July 1 Through August 14, 2015
 
For the Period August 15 Through September 30, 2015
 
For the Three
Months Ended September 30, 2016
 
(Dollars in thousands)
Service cost
$
323

 
$
227

 
$
506

Interest cost
762

 
776

 
1,498

Expected return on plan assets
(676
)
 
(658
)
 
(1,310
)
Amortization of prior service cost
1

 
—

 
3

Net cost
$
410

 
$
345

 
$
697


 
Predecessor
 
Successor
 
For the Period
January 1 Through August 14, 2015
 
For the Period August 15 Through September 30, 2015
 
For the Nine
Months Ended September 30, 2016
 
(Dollars in thousands)
Service cost
$
1,656

 
$
227

 
$
1,517

Interest cost
3,814

 
776

 
4,494

Expected return on plan assets
(3,384
)
 
(658
)
 
(3,929
)
Amortization of prior service cost
3

 
—

 
7

Net cost
$
2,089

 
$
345

 
$
2,089


The components of our consolidated net postretirement costs are set forth in the following table: 
 
Predecessor
 
Successor
 
For the Period
July 1 Through August 14, 2015
 
For the Period August 15 Through September 30, 2015
 
For the Three
Months Ended September 30, 2016
 
(Dollars in thousands)
Service cost
$
3

 
$
2

 
$
1

Interest cost
156

 
152

 
272

Amortization of prior service cost
(22
)
 
—

 
—

Net cost
$
137

 
$
154

 
$
273



 
Predecessor
 
Successor
 
For the Period
January 1 Through August 14, 2015
 
For the Period August 15 Through September 30, 2015
 
For the Nine
Months Ended September 30, 2016
 
(Dollars in thousands)
Service cost
$
11

 
$
2

 
$
3

Interest cost
786

 
152

 
815

Amortization of prior service cost
(108
)
 
—

 
—

Net cost
$
689

 
$
154

 
$
818