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Pension Benefit and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the periods indicated are:

(Dollars in thousands)
Pension Benefits
 
Retirement Health and Life Insurance Benefits
Three Months Ended
 
Nine Months Ended
 
Three Months Ended
 
Nine Months Ended
Change in benefit obligation:
September 30, 2012
 
September 30, 2011
 
September 30, 2012
 
September 30, 2011
 
September 30, 2012
 
September 30, 2011
 
September 30, 2012
 
September 30, 2011
Service cost
$
1,150

 
$
1,060

 
$
3,447

 
$
3,180

 
$
149

 
$
171

 
$
481

 
$
523

Interest cost
2,094

 
2,116

 
6,336

 
6,348

 
92

 
110

 
272

 
304

Expected return on plan assets
(2,495
)
 
(2,591
)
 
(7,397
)
 
(7,773
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
116

 
150

 
347

 
450

 
(113
)
 
(157
)
 
(338
)
 
(471
)
Amortization of net loss
1,347

 
553

 
4,138

 
1,659

 
66

 
130

 
247

 
292

Special termination benefit
—

 
—

 
—

 
—

 
—

 
—

 
1,593

 
—

Settlement charge
2,023

 
—

 
2,023

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost
$
4,235

 
$
1,288

 
$
8,894

 
$
3,864

 
$
194

 
$
254

 
$
2,255

 
$
648