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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs Components of net periodic benefit cost were as follows (in thousands):
 
Three months ended
 
Six months ended
 
June 30,
2019
 
July 1,
2018
 
June 30,
2019
 
July 1,
2018
Pension and SERPA Benefits:
 
 
 
 
 
 
 
Service cost
$
6,632

 
$
8,063

 
$
13,264

 
$
16,218

Interest cost
21,371

 
20,729

 
42,742

 
41,319

Expected return on plan assets
(35,581
)
 
(36,926
)
 
(71,162
)
 
(73,817
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service credit
(483
)
 
(105
)
 
(966
)
 
(211
)
Net loss
11,128

 
16,318

 
22,256

 
32,137

Curtailment loss
—

 
—

 
—

 
1,018

Net periodic benefit cost
$
3,067

 
$
8,079

 
$
6,134

 
$
16,664

Postretirement Healthcare Benefits:
 
 
 
 
 
 
 
Service cost
$
1,185

 
$
1,789

 
$
2,369

 
$
3,601

Interest cost
2,938

 
2,886

 
5,876

 
5,783

Expected return on plan assets
(3,507
)
 
(3,541
)
 
(7,014
)
 
(7,082
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service credit
(595
)
 
(460
)
 
(1,190
)
 
(920
)
Net loss
69

 
454

 
138

 
908

Special retirement benefits
1,583

 
—

 
1,583

 
—

Curtailment gain
(960
)
 
—

 
(960
)
 
—

Net periodic benefit cost
$
713

 
$
1,128

 
$
802

 
$
2,290