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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 25, 2017
All Plans  
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
 
 
June 25, 2017
 
June 26, 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
 
15,594

 
1,956

 
17,550

 
16,573

 
2,034

 
18,607

Expected return on plan assets
 
(26,136
)
 
—

 
(26,136
)
 
(27,789
)
 
—

 
(27,789
)
Amortization of actuarial loss
 
7,353

 
1,088

 
8,441

 
7,068

 
1,053

 
8,121

Amortization of prior service credit
 
(486
)
 
—

 
(486
)
 
(486
)
 
—

 
(486
)
Net periodic pension (income)/cost
 
$
(1,252
)
 
$
3,044

 
$
1,792

 
$
(2,386
)
 
$
3,087

 
$
701


 
 
For the Six Months Ended
 
 
June 25, 2017
 
June 26, 2016
(In thousands)
 
Qualified
Plans
 
Non-
Qualified
Plans
 
All
Plans
 
Qualified
Plans
 
Non-
Qualified
Plans
 
All
Plans
Service cost
 
$
4,846

 
$
—

 
$
4,846

 
$
4,495

 
$
—

 
$
4,495

Interest cost
 
31,188

 
3,912

 
35,100

 
33,147

 
4,068

 
37,215

Expected return on plan assets
 
(52,272
)
 
—

 
(52,272
)
 
(55,579
)
 
—

 
(55,579
)
Amortization of actuarial loss
 
14,706

 
2,176

 
16,882

 
14,137

 
2,106

 
16,243

Amortization of prior service credit
 
(972
)
 
—

 
(972
)
 
(972
)
 
—

 
(972
)
Net periodic pension (income)/cost
 
$
(2,504
)
 
$
6,088

 
$
3,584

 
$
(4,772
)
 
$
6,174

 
$
1,402
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 Six Months Ended
(In thousands)
 
June 25, 2017

 
June 26, 2016

 
June 25, 2017

 
June 26, 2016

Service cost
 
$
92

 
$
104

 
$
184

 
$
208

Interest cost
 
470

 
495

 
940

 
990

Amortization of actuarial loss
 
905

 
1,026

 
1,810

 
2,052

Amortization of prior service credit
 
(1,938
)
 
(2,110
)
 
(3,877
)
 
(4,220
)
Net periodic postretirement benefit income
 
$
(471
)
 
$
(485
)
 
$
(943
)
 
$
(970
)