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Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
 
For the Nine Months
Ended September 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Service cost
$
506

 
$
496

 
$
1,517

 
$
1,487

Interest cost
1,498

 
1,385

 
4,494

 
4,154

Expected return on plan assets
(1,307
)
 
(1,389
)
 
(3,922
)
 
(4,166
)
Net cost
$
697

 
$
492

 
$
2,089

 
$
1,475
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 September 30,
 
For the Nine Months
Ended September 30,
 
2016
 
2017
 
2016
 
2017
 
(Dollars in thousands)
Service cost
$
1

 
$
1

 
$
3

 
$
1

Interest cost
272

 
241

 
815

 
724

Net cost
$
273

 
$
242

 
$
818

 
$
725