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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Pension Costs [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule Of Benefit Plans
 
For the Three
Months Ended
 
For the Six
Months Ended
 
June 30,
 
June 30,
 
2014
 
2015
 
2014
 
2015
 
(Dollars in thousands)
 
(Dollars in thousands)
Service cost
$
473

 
$
506

 
$
946

 
$
1,333

Interest cost
2,169

 
1,526

 
4,338

 
3,052

Expected return on plan assets
(1,938
)
 
(1,354
)
 
(3,876
)
 
(2,708
)
Amortization of prior service cost
1

 
1

 
2

 
2

Net cost
$
705

 
$
679

 
$
1,410

 
$
1,679
Postretirement Costs [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule Of Benefit Plans
 
For the Three Months Ended
 
For the Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2015
 
2014
 
2015
 
(Dollars in thousands)
 
(Dollars in thousands)
Service cost
$
19

 
$
4

 
$
38

 
$
8

Interest cost
352

 
315

 
704

 
630

Curtailment loss
1,048

 
—

 
1,048

 
—

Amortization of prior service benefit
(47
)
 
(43
)
 
(94
)
 
(86
)
Net cost
$
1,372

 
$
276

 
$
1,696

 
$
552