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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
Components of net periodic benefit cost were as follows (in thousands):
 
Three months ended
 
Nine months ended
 
September 30,
2018
 
September 24,
2017
 
September 30,
2018
 
September 24,
2017
Pension and SERPA Benefits
 
 
 
 
 
 
 
Service cost
$
8,063

 
$
7,896

 
$
24,281

 
$
23,688

Interest cost
20,729

 
21,269

 
62,048

 
63,807

Expected return on plan assets
(36,925
)
 
(35,345
)
 
(110,742
)
 
(106,035
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service (credit) cost
(105
)
 
256

 
(316
)
 
764

Net loss
16,318

 
10,998

 
48,455

 
32,994

Curtailment loss
—

 
—

 
1,018

 
—

Net periodic benefit cost
$
8,080

 
$
5,074

 
$
24,744

 
$
15,218

Postretirement Healthcare Benefits
 
 
 
 
 
 
 
Service cost
$
1,789

 
$
1,875

 
$
5,390

 
$
5,625

Interest cost
2,886

 
3,412

 
8,669

 
10,236

Expected return on plan assets
(3,541
)
 
(3,156
)
 
(10,623
)
 
(9,468
)
Amortization of unrecognized:
 
 
 
 
 
 
 
Prior service credit
(460
)
 
(543
)
 
(1,380
)
 
(1,629
)
Net loss
454

 
815

 
1,362

 
2,445

Net periodic benefit cost
$
1,128

 
$
2,403

 
$
3,418

 
$
7,209