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Pension and Postretirement Benefit Obligations (Tables)
6 Months Ended
Jul. 02, 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:

Second QuarterFirst Half
(in thousands)2021202020212020
Service cost$1,863 $1,658 $3,726 $3,317 
Interest cost2,455 2,760 4,908 5,520 
Expected return on plan assets(3,248)(3,383)(6,498)(6,766)
Recognized net actuarial loss1,216 1,190 2,435 2,379 
Amortization of prior service cost— 
Net periodic pension cost$2,286 $2,229 $4,572 $4,459 
The components of net periodic postretirement benefit cost were as follows:

Second QuarterFirst Half
(in thousands)2021202020212020
Service cost$403 $376 $806 $752 
Interest cost448 504 895 1,007 
Recognized net actuarial loss185 87 371 175 
Net periodic postretirement benefit cost$1,036 $967 $2,072 $1,934