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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 24, 2017
Pension Plan  
Pension Benefits  
Schedule of Components of Net Periodic Pension Cost and Postretirement Benefit Income
The components of net periodic pension cost were as follows:
 
 
For the Quarters Ended
 
 
September 24, 2017
 
September 25, 2016
(In thousands)
 
Qualified
Plans
 
Non-
Qualified
Plans
 
All
Plans
 
Qualified
Plans
 
Non-
Qualified
Plans
 
All
Plans
Service cost
 
$
2,423

 
$
—

 
$
2,423

 
$
2,248

 
$
—

 
$
2,248

Interest cost
 
15,596

 
1,956

 
17,552

 
16,573

 
2,034

 
18,607

Expected return on plan assets
 
(26,136
)
 
—

 
(26,136
)
 
(27,790
)
 
—

 
(27,790
)
Amortization of actuarial loss
 
7,351

 
1,088

 
8,439

 
7,069

 
1,054

 
8,123

Amortization of prior service credit
 
(486
)
 
—

 
(486
)
 
(487
)
 
—

 
(487
)
Net periodic pension (income)/cost
 
$
(1,252
)
 
$
3,044

 
$
1,792

 
$
(2,387
)
 
$
3,088

 
$
701


 
 
For the Nine Months Ended
 
 
September 24, 2017
 
September 25, 2016
(In thousands)
 
Qualified
Plans
 
Non-
Qualified
Plans
 
All
Plans
 
Qualified
Plans
 
Non-
Qualified
Plans
 
All
Plans
Service cost
 
$
7,269

 
$
—

 
$
7,269

 
$
6,743

 
$
—

 
$
6,743

Interest cost
 
46,784

 
5,868

 
52,652

 
49,720

 
6,102

 
55,822

Expected return on plan assets
 
(78,408
)
 
—

 
(78,408
)
 
(83,369
)
 
—

 
(83,369
)
Amortization of actuarial loss
 
22,057

 
3,264

 
25,321

 
21,206

 
3,160

 
24,366

Amortization of prior service credit
 
(1,458
)
 
—

 
(1,458
)
 
(1,459
)
 
—

 
(1,459
)
Net periodic pension (income)/cost
 
$
(3,756
)
 
$
9,132

 
$
5,376

 
$
(7,159
)
 
$
9,262

 
$
2,103
Other Postretirement Benefit Plan  
Pension Benefits  
Schedule of Components of Net Periodic Pension Cost and Postretirement Benefit Income
The components of net periodic postretirement benefit income were as follows:
 
 
For the Quarters Ended
 
For the Nine Months Ended
(In thousands)
 
September 24, 2017

 
September 25, 2016

 
September 24, 2017

 
September 25, 2016

Service cost
 
$
92

 
$
104

 
$
276

 
$
313

Interest cost
 
470

 
495

 
1,410

 
1,485

Amortization of actuarial loss
 
905

 
1,026

 
2,715

 
3,078

Amortization of prior service credit
 
(1,939
)
 
(2,110
)
 
(5,816
)
 
(6,330
)
Net periodic postretirement benefit income
 
$
(472
)
 
$
(485
)
 
$
(1,415
)
 
$
(1,454
)