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Employee Benefit Plans and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2014
Employee Benefit Plans and Other Postretirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The components of net periodic benefit cost were as follows (dollars in thousands):
 
Pension Plans
 
Postretirement Plans
 
Three Months Ended
March 31
 
Three Months Ended
March 31
 
2014
 
2013
 
2014
 
2013
Service cost
$
5,794

 
$
6,249

 
$
392

 
$
515

Interest cost
11,434

 
3,991

 
308

 
311

Expected return on plan assets
(12,679
)
 
(3,751
)
 

 

Net amortization of unrecognized amounts
 
 
 
 
 
 
 
Prior service cost
1,641

 
1,560

 
(57
)
 
(106
)
Actuarial loss
155

 
1,502

 
24

 
134

Net periodic benefit cost
$
6,345

 
$
9,551

 
$
667

 
$
854