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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Components Of Net Periodic Cost
The components of net periodic cost are as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in thousands)
Pension Benefits
 
Other
Postretirement
Benefits
 
Pension Benefits
 
Other
Postretirement
Benefits
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
1,513

 
$
3,131

 
$
22

 
$
29

 
$
4,540

 
$
10,121

 
$
67

 
$
87

Interest cost
9,144

 
9,525

 
93

 
127

 
27,433

 
28,193

 
279

 
381

Expected return on plan assets
(12,970
)
 
(12,832
)
 
—

 
—

 
(38,909
)
 
(38,492
)
 
—

 
—

Amortization of prior service cost
3

 
102

 
(59
)
 
(59
)
 
10

 
302

 
(177
)
 
(177
)
Amortization of net loss (gain)
3,444

 
4,794

 
(11
)
 
(21
)
 
10,330

 
14,417

 
(34
)
 
(63
)
Net periodic cost
$
1,134

 
$
4,720

 
$
45

 
$
76

 
$
3,404

 
$
14,541

 
$
135

 
$
228