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Pensions and Other Post-employment Benefits (Tables)
 6 Months Ended
Jun. 28, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following is a summary of the net periodic benefit cost for the second quarter of 2019 and 2018 for the domestic pension plans (which include the defined benefit pension plan and the supplemental retirement plans) and the domestic retiree medical plan.
 

Pension Benefits

Other Benefits
 

Second Quarter Ended

Second Quarter Ended


June 28,

June 29,

June 28,

June 29,
(Thousands)

2019

2018

2019

2018
Components of net periodic benefit cost (benefit)








Service cost

$
1,418


$
1,674


$
18


$
28

Interest cost

1,347


2,397


99


99

Expected return on plan assets

(2,167
)

(3,697
)

—


—

Amortization of prior service benefit

122


(30
)

(375
)

(374
)
Amortization of net loss (gain)

627


1,959


(23
)

—

Pension curtailment charge
 
3,296

 
—

 
—

 
—

Net periodic benefit cost (benefit)

$
4,643


$
2,303


$
(281
)

$
(247
)

 
 
Pension Benefits
 
Other Benefits
 
 
Six Months Ended
 
Six Months Ended
 
 
June 28,
 
June 29,
 
June 28,
 
June 29,
(Thousands)
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost (benefit)
 
 
 
 
 
 
 
 
Service cost
 
$
2,758

 
$
3,348

 
$
35

 
$
56

Interest cost
 
2,904

 
4,794

 
199

 
198

Expected return on plan assets
 
(4,290
)
 
(7,394
)
 
—

 
—

Amortization of prior service benefit
 
242

 
(61
)
 
(749
)
 
(749
)
Amortization of net loss (gain)
 
1,431

 
3,919

 
(46
)
 
—

Pension curtailment charge
 
3,296

 
—

 
—

 
—

Net periodic benefit cost (benefit)
 
$
6,341

 
$
4,606

 
$
(561
)
 
$
(495
)