Benefit Plans (Tables)

6 Months Ended

Jun. 26, 2021

Retirement Benefits [Abstract]

Schedule of net benefit costs

The components of net periodic benefit cost for the three and six months ended June 26, 2021 and June 27, 2020 were as follows: 

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Components of net periodic benefit cost:
Service cost	$	700	$	592	$	1,402	$	1,210
Interest cost	443		486		883		1,144
Expected return on plan assets	(371)		(402)		(738)		(1,129)
Amortization of prior service and net actuarial loss	334		264		665		409
Net periodic benefit cost	$	1,106	$	940	$	2,212	$	1,634