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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
 
(Dollars in thousands)
Service cost
$
498

 
$
496

 
$
996

 
$
992

Interest cost
1,241

 
1,385

 
2,482

 
2,769

Expected return on plan assets
(1,502
)
 
(1,389
)
 
(3,004
)
 
(2,777
)
Net cost
$
237

 
$
492

 
$
474

 
$
984
Postretirement Costs  
Defined Benefit Plan Disclosure [Line Items]  
Schedule Of Benefit Plans
The 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,
 
2018
 
2017
 
2018
 
2017
 
(Dollars in thousands)
Service cost
$
—

 
$
1

 
$
—

 
$
1

Interest cost
251

 
241

 
502

 
483

Net cost
$
251

 
$
242

 
$
502

 
$
484