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Pensions and Other Post-employment Benefits (Tables)
 3 Months Ended
Mar. 29, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following is a summary of the net periodic benefit cost for the first 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
 

First Quarter Ended

First Quarter Ended


March 29,

March 30,

March 29,

March 30,
(Thousands)

2019

2018

2019

2018
Components of net periodic benefit cost (benefit)








Service cost

$
1,340


$
1,674


$
17


$
28

Interest cost

1,557


2,397


100


99

Expected return on plan assets

(2,123
)

(3,697
)

—


—

Amortization of prior service benefit

120


(31
)

(374
)

(374
)
Amortization of net loss (gain)

804


1,960


(23
)

—

Net periodic benefit cost (benefit)

$
1,698


$
2,303


$
(280
)

$
(247
)