Benefit Plans (Tables)

9 Months Ended

Sep. 25, 2021

Retirement Benefits [Abstract]

Schedule of net benefit costs

The components of net periodic benefit cost for the three and nine months ended September 25, 2021 and September 26, 2020 were as follows: 

	For the Three Months Ended				For the Nine Months Ended
(in thousands)	September 25, 2021		September 26, 2020		September 25, 2021		September 26, 2020
Components of net periodic benefit cost:
Service cost	$	684	$	615	$	2,086	$	1,825
Interest cost	434		511		1,317		1,655
Expected return on plan assets	(361)		(422)		(1,099)		(1,551)
Amortization of prior service and net actuarial loss	327		279		992		688
Net periodic benefit cost	$	1,084	$	983	$	3,296	$	2,617