Benefit Plans (Tables)

6 Months Ended

Jun. 27, 2020

Retirement Benefits [Abstract]

Schedule of net benefit costs

The components of net periodic benefit cost for the three and six months ended June 27, 2020 and June 29, 2019 were as follows: 

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 27, 2020		June 29, 2019		June 27, 2020		June 29, 2019
Components of net periodic benefit cost:
Service cost	$	592	$	514	$	1,210	$	1,014
Interest cost	486		813		1,144		1,597
Expected return on plan assets	(402)		(821)		(1,129)		(1,611)
Amortization of prior service and net actuarial loss	264		62		409		124
Net periodic benefit cost	$	940	$	568	$	1,634	$	1,124