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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 29, 2013
Compensation and Retirement Disclosure [Abstract]  
Components Of Net Periodic Benefit Costs
Components of net periodic benefit costs were as follows (in thousands):
 
Three months ended
 
Nine months ended
 
September 29,
2013
 
September 30,
2012
 
September 29,
2013
 
September 30,
2012
Pension and SERPA Benefits
 
 
 
 
 
 
 
Service cost
$
8,997

 
$
8,420

 
$
26,990

 
$
25,260

Interest cost
19,812

 
20,816

 
59,436

 
62,448

Expected return on plan assets
(31,832
)
 
(29,277
)
 
(95,496
)
 
(87,832
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service cost
437

 
740

 
1,310

 
2,219

Net loss
14,652

 
10,969

 
43,956

 
32,906

Net periodic benefit cost
$
12,066

 
$
11,668

 
$
36,196

 
$
35,001

Postretirement Healthcare Benefits
 
 
 
 
 
 
 
Service cost
$
1,965

 
$
1,854

 
$
5,894

 
$
5,560

Interest cost
3,900

 
4,578

 
11,699

 
13,733

Expected return on plan assets
(2,384
)
 
(2,356
)
 
(7,153
)
 
(7,068
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service credit
(963
)
 
(963
)
 
(2,890
)
 
(2,890
)
Net loss
2,137

 
1,855

 
6,412

 
5,566

Net periodic benefit cost
$
4,655

 
$
4,968

 
$
13,962

 
$
14,901