Benefit Plans (Tables)

3 Months Ended

Mar. 27, 2021

Retirement Benefits [Abstract]

Schedule of net benefit costs

The components of net periodic benefit cost for the three months ended March 27, 2021 and March 28, 2020 were as follows: 

	For the Three Months Ended
(in thousands)	March 27, 2021		March 28, 2020
Components of net periodic benefit cost:
Service cost	$	702	$	618
Interest cost	440		658
Expected return on plan assets	(367)		(727)
Amortization of prior service and net actuarial loss	331		145
Net periodic benefit cost	$	1,106	$	694