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Employee Benefit Plans and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2014
Employee Benefit Plans and Other Postretirement Benefits [Abstract]  
Employee Benefit Plans and Other Postretirement Benefits
Employee Benefit Plans and Other Postretirement Benefits

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



PCA makes pension plan contributions that are sufficient to fund its actuarially determined costs, generally equal to the minimum amounts required by the Employee Retirement Income Security Act (ERISA). In 2014, we expect to contribute the required minimum, which we estimate to be approximately $5.0 million.