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Employee Benefit Plans (Tables)
 6 Months Ended
Jul. 01, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
Components of net periodic benefit costs were as follows (in thousands):
 
Three months ended
 
Six months ended
 
July 1,
2018
 
June 25,
2017
 
July 1,
2018
 
June 25,
2017
Pension and SERPA Benefits
 
 
 
 
 
 
 
Service cost
$
8,063

 
$
7,896

 
$
16,218

 
$
15,792

Interest cost
20,729

 
21,269

 
41,319

 
42,538

Expected return on plan assets
(36,926
)
 
(35,345
)
 
(73,817
)
 
(70,690
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service (credit) cost
(105
)
 
254

 
(211
)
 
508

Net loss
16,318

 
10,998

 
32,137

 
21,996

Curtailment loss
—

 
—

 
1,018

 
—

Net periodic benefit cost
$
8,079

 
$
5,072

 
$
16,664

 
$
10,144

Postretirement Healthcare Benefits
 
 
 
 
 
 
 
Service cost
$
1,789

 
$
1,875

 
$
3,601

 
$
3,750

Interest cost
2,886

 
3,412

 
5,783

 
6,824

Expected return on plan assets
(3,541
)
 
(3,156
)
 
(7,082
)
 
(6,312
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service credit
(460
)
 
(543
)
 
(920
)
 
(1,086
)
Net loss
454

 
815

 
908

 
1,630

Net periodic benefit cost
$
1,128

 
$
2,403

 
$
2,290

 
$
4,806