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Pensions and Other Post-employment Benefits (Tables)
 3 Months Ended
Mar. 30, 2018
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 2018 and 2017 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 30,

March 31,

March 30,

March 31,
(Thousands)

2018

2017

2018

2017
Components of net periodic benefit cost (benefit)








Service cost

$
1,674


$
1,719


$
28


$
23

Interest cost

2,397


2,356


99


99

Expected return on plan assets

(3,697
)

(3,365
)

—


—

Amortization of prior service benefit

(31
)

(121
)

(374
)

(374
)
Amortization of net loss

1,960


1,587


—


—

Net periodic benefit cost (benefit)

$
2,303


$
2,176


$
(247
)

$
(252
)