Benefit Plans (Tables)

9 Months Ended

Sep. 26, 2020

Retirement Benefits [Abstract]

Schedule of net benefit costs

The components of net periodic benefit cost for the three and nine months ended September 26, 2020 and September 28, 2019 were as follows: 

	For the Three Months Ended				For the Nine Months Ended
(in thousands)	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Components of net periodic benefit cost:
Service cost	$	615	$	509	$	1,825	$	1,523
Interest cost	511		777		1,655		2,374
Expected return on plan assets	(422)		(773)		(1,551)		(2,384)
Amortization of prior service and net actuarial loss	279		60		688		184
Net periodic benefit cost	$	983	$	573	$	2,617	$	1,697