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Retirement Benefits
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefits
Retirement Benefits

The components of the net periodic pension benefit costs were as follows:

 
Three Months Ended
 
Nine Months Ended
 
Sept. 30, 2014
 
Sept. 30, 2013
 
Sept. 30, 2014
 
Sept. 30, 2013
 
(Dollars in thousands)
Service cost
$
3,392

 
$
3,814

 
$
10,163

 
$
11,870

Interest cost
7,399

 
6,809

 
22,248

 
20,081

Expected return on plan assets
(14,312
)
 
(13,092
)
 
(43,000
)
 
(39,361
)
Amortization of prior service cost
272

 
490

 
891

 
1,339

Amortization of actuarial losses
154

 
3,532

 
588

 
9,417

Net periodic benefit (credit) cost
$
(3,095
)
 
$
1,553

 
$
(9,110
)
 
$
3,346

 
The components of the net periodic other postretirement benefits costs were as follows:
 
Three Months Ended
 
Nine Months Ended
 
Sept. 30, 2014
 
Sept. 30, 2013
 
Sept. 30, 2014
 
Sept. 30, 2013
 
(Dollars in thousands)
Service cost
$
138

 
$
139

 
$
402

 
$
531

Interest cost
420

 
343

 
1,245

 
1,260

Amortization of prior service credit
(726
)
 
(674
)
 
(2,154
)
 
(2,013
)
Amortization of actuarial gains
(75
)
 
(229
)
 
(246
)
 
(125
)
Net periodic benefit credit
$
(243
)
 
$
(421
)
 
$
(753
)
 
$
(347
)