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Employee Benefit Plans (Tables)
 6 Months Ended
Jul. 01, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Credit)
The following table summarizes the components of net periodic benefit cost (credit) for the Company’s various defined benefit employee pension and postretirement plans for the three and six months ended July 1, 2012 and July 3, 2011:
 
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Three Months Ended
 
July 1,
2012
 
July 3,
2011
 
July 1,
2012
 
July 3,
2011
 
(In thousands)
Service cost
$
977

 
$
972

 
$
28

 
$
21

Interest cost
5,792

 
6,321

 
37

 
41

Expected return on plan assets
(5,140
)
 
(5,649
)
 
(219
)
 
(221
)
Amortization of prior service costs
(60
)
 
(56
)
 
—

 
(63
)
Net periodic benefit cost (credit)
$
1,569

 
$
1,588

 
$
(154
)
 
$
(222
)
 
 
 
 
 
 
 
 
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Six Months Ended
 
July 1,
2012
 
July 3,
2011
 
July 1,
2012
 
July 3,
2011
 
(In thousands)
Service cost
$
1,957

 
$
1,944

 
$
56

 
$
43

Interest cost
11,607

 
12,639

 
74

 
81

Expected return on plan assets
(10,282
)
 
(11,297
)
 
(438
)
 
(442
)
Amortization of prior service
(120
)
 
(112
)
 
—

 
(126
)
Net periodic benefit cost (credit)
$
3,162

 
$
3,174

 
$
(308
)
 
$
(444
)