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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Components Of Net Periodic Cost
The components of net periodic cost are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in thousands)
Pension Benefits
 
Other
Postretirement
Benefits
 
Pension Benefits
 
Other
Postretirement
Benefits
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
1,498

 
$
3,495

 
$
18

 
$
29

 
$
3,027

 
$
6,990

 
$
45

 
$
58

Interest cost
8,878

 
9,334

 
62

 
127

 
18,289

 
18,668

 
186

 
254

Expected return on plan assets
(12,728
)
 
(12,830
)
 
—

 
—

 
(25,941
)
 
(25,660
)
 
—

 
—

Amortization of prior service cost
13

 
100

 
(59
)
 
(59
)
 
7

 
200

 
(118
)
 
(118
)
Amortization of net loss (gain)
3,723

 
4,816

 
12

 
(21
)
 
6,887

 
9,623

 
(23
)
 
(42
)
Net periodic cost
$
1,384

 
$
4,915

 
$
33

 
$
76

 
$
2,269

 
$
9,821

 
$
90

 
$
152