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Retirement Benefits
3 Months Ended
Mar. 26, 2021
Defined Benefit Plan [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):
 Three Months Ended
 March 26,
2021
March 27,
2020
Pension Benefits
Service cost
$2,721 $2,422 
Interest cost
2,981 3,407 
Expected return on assets
(5,130)(4,750)
Amortization and other
2,551 2,721 
Net periodic benefit cost
$3,123 $3,800 
Postretirement Medical
Service cost
$175 $175 
Interest cost
250 248 
Amortization
250 177 
Net periodic benefit cost
$675 $600