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Employee Benefit Plans
3 Months Ended
Apr. 05, 2020
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Postretirement Benefit Plans

The following table summarizes the components of net periodic pension credit for the Company’s various defined benefit employee pension and postretirement plans:
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Three Months Ended
 
April 5,
2020
 
March 31,
2019
 
April 5,
2020
 
March 31,
2019
 
(In thousands)
Service and administrative costs
$
1,907

 
$
1,633

 
$
18

 
$
22

Interest cost
3,144

 
4,159

 
24

 
29

Expected return on plan assets
(5,384
)
 
(6,176
)
 
(347
)
 
(294
)
Amortization of prior service costs

 
(39
)
 

 

Net periodic pension credit
$
(333
)
 
$
(423
)
 
$
(305
)
 
$
(243
)

During the three months ended April 5, 2020 and March 31, 2019, the Company contributed $2.1 million each, in the aggregate, to pension plans outside of the United States.
The Company recognizes actuarial gains and losses, unless an interim remeasurement is required, in the fourth quarter of the year in which the gains and losses occur, in accordance with the Company's accounting method for defined benefit pension plans and other postretirement benefits as described in Note 1 of the Company's audited consolidated financial statements and notes included in its 2019 Form 10-K. Such adjustments for gains and losses are primarily driven by events and circumstances beyond the Company's control, including changes in interest rates, the performance of the financial markets and mortality assumptions. Service costs for plans in active accrual are included in operating expenses.