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Pension and Other Postretirement Obligations (Tables)
3 Months Ended
Apr. 04, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The following table provides the components of net periodic benefit costs for our pension and other postretirement benefit plans: 
 Pension ObligationsOther Postretirement Obligations
Three Months EndedApril 4, 2021March 29, 2020April 4, 2021March 29, 2020
 (In thousands)
Service cost$886 $932 $$
Interest cost1,806 2,337 177 202 
Expected return on plan assets(3,668)(3,940)— — 
Amortization of prior service cost 28 44 — — 
Actuarial losses (gains)979 677 (6)(19)
Net periodic benefit cost
$31 $50 $180 $191