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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Components Of Net Periodic Cost
The components of net periodic cost are as follows:
 
 
Three Months Ended March 31,
(in thousands)
Pension Benefits
 
Other
Postretirement
Benefits
 
2013
 
2012
 
2013
 
2012
Service cost
$
1,529

 
$
3,495

 
$
27

 
$
29

Interest cost
9,410

 
9,334

 
125

 
127

Expected return on plan assets
(13,212
)
 
(12,830
)
 
—

 
—

Amortization of prior service cost
(6
)
 
100

 
(59
)
 
(59
)
Amortization of net loss (gain)
3,164

 
4,843

 
(35
)
 
(21
)
Settlements
—

 
(27
)
 
—

 
—

Net periodic cost
$
885

 
$
4,915

 
$
58

 
$
76