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Pension and Postretirement Benefit Obligations (Tables)
9 Months Ended
Oct. 01, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost
The components of net periodic pension cost were as follows:

Third QuarterFirst Nine Months
(in thousands)2021202020212020
Service cost$1,863 $1,659 $5,589 $4,976 
Interest cost2,452 2,760 7,360 8,280 
Expected return on plan assets(3,250)(3,382)(9,748)(10,148)
Recognized net actuarial loss1,219 1,189 3,654 3,568 
Amortization of prior service cost14 
Net periodic pension cost$2,285 $2,231 $6,857 $6,690 
The components of net periodic postretirement benefit cost were as follows:

Third QuarterFirst Nine Months
(in thousands)2021202020212020
Service cost$403 $376 $1,209 $1,128 
Interest cost447 504 1,342 1,511 
Recognized net actuarial loss186 88 557 263 
Net periodic postretirement benefit cost$1,036 $968 $3,108 $2,902