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Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2017
Pension Costs  
Defined Benefit Plan Disclosure [Line Items]  
Schedule Of Benefit Plans
The components of our consolidated net pension costs are set forth in the following table:
 
For the Three Months Ended June 30,
 
For the Six Months
Ended June 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Service cost
$
508

 
$
496

 
$
1,016

 
$
992

Interest cost
1,498

 
1,385

 
2,996

 
2,769

Expected return on plan assets
(1,310
)
 
(1,389
)
 
(2,620
)
 
(2,777
)
Net cost
$
696

 
$
492

 
$
1,392

 
$
984

Postretirement Costs  
Defined Benefit Plan Disclosure [Line Items]  
Schedule Of Benefit Plans
he components of our consolidated net postretirement costs are set forth in the following table: 
 
For the Three Months Ended June 30,
 
For the Six Months
Ended June 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Service cost
$
1

 
$
1

 
$
2

 
$
1

Interest cost
272

 
241

 
543

 
483

Net cost
$
273

 
$
242

 
$
545

 
$
484