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Retirement Benefits
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefits
Note 7.               Retirement Benefits

The components of the net periodic pension benefit costs for the three months ended March 31 were as follows:
 
2014
 
2013
 
(Dollars in thousands)
Service cost
$
3,455

 
$
4,110

Interest cost
7,430

 
6,648

Expected return on plan assets
(14,355
)
 
(13,114
)
Amortization of prior service cost
285

 
428

Amortization of actuarial losses
217

 
2,987

Net periodic benefit (credit) cost
$
(2,968
)
 
$
1,059

 
The components of the net periodic other postretirement benefits costs for the three months ended March 31 were as follows:
 
2014
 
2013
 
(Dollars in thousands)
Service cost
$
138

 
$
201

Interest cost
408

 
474

Amortization of prior service credit
(714
)
 
(669
)
Amortization of actuarial (gains) losses
(85
)
 
54

Net periodic benefit (credit) cost
$
(253
)
 
$
60