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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 29, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Pension and Postretirement Benefit Costs
The components of net periodic benefit costs from defined benefit plans that have been recorded are shown in the following table:
 
Pension
Postretirement
 
Three Months Ended
 
Three Months Ended
Components of Net Periodic Benefit Cost
September 29, 2018
 
September 23, 2017
 
September 29, 2018
 
September 23, 2017
Service cost
$
3,059

 
$
1,184

 
$
330

 
$
236

Interest cost
8,149

 
3,318

 
312

 
198

Expected return on plan assets
(13,695
)
 
(5,548
)
 

 

Amortization of prior service cost
143

 
190

 

 

Amortization of losses
2,913

 
2,913

 
57

 
83

Amortization of negative plan amendment

 

 
(38
)
 
(38
)
Total net periodic benefit cost
$
569

 
$
2,057

 
$
661

 
$
479

 
 
 
 
 
 
 
 
 
Pension
Postretirement
 
Nine Months Ended
 
Nine Months Ended
Components of Net Periodic Benefit Cost
September 29, 2018
 
September 23, 2017
 
September 29, 2018
 
September 23, 2017
Service cost
$
9,246

 
$
3,552

 
$
1,404

 
$
707

Interest cost
24,612

 
9,954

 
961

 
594

Expected return on plan assets
(41,347
)
 
(16,645
)
 

 

Amortization of prior service cost
429

 
571

 

 
1

Amortization of losses
8,735

 
8,739

 
172

 
250

Amortization of negative plan amendment

 

 
(115
)
 
(115
)
Total net periodic benefit cost
$
1,675

 
$
6,171

 
$
2,422

 
$
1,437