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Pension and Other Postretirement Obligations
6 Months Ended
Jul. 04, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Obligations Pension and Other Postretirement Obligations
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 EndedJuly 4, 2021June 28, 2020July 4, 2021June 28, 2020
 (In thousands)
Service cost$1,155 $892 $$
Interest cost1,897 2,410 186 195 
Expected return on plan assets(4,527)(4,004)— — 
Amortization of prior service cost 28 45 — — 
Actuarial losses (gains)976 673 (5)(19)
Net periodic benefit cost (benefit)$(471)$16 $190 $184 
 Pension ObligationsOther Postretirement Obligations
Six Months EndedJuly 4, 2021June 28, 2020July 4, 2021June 28, 2020
 (In thousands)
Service cost$2,041 $1,824 $18 $16 
Interest cost3,703 4,747 363 397 
Expected return on plan assets(8,195)(7,944)— — 
Amortization of prior service cost 56 89 — — 
Actuarial losses (gains)1,955 1,350 (11)(38)
Net periodic benefit cost (benefit)$(440)$66 $370 $375