Employee Benefit Plans (Tables)

3 Months Ended

Mar. 28, 2021

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Costs

Components of net periodic benefit cost for the Company's defined benefit plans were as follows (in thousands):

	Three months ended
	March 28, 2021		March 29, 2020
Pension and SERPA Benefits:
Service cost	$	6,348	$	6,806
Interest cost	15,470		19,112
Expected return on plan assets	(32,720)		(33,764)
Amortization of unrecognized:
Prior service credit	(312)		(272)
Net loss	18,386		16,372
Settlement loss	816		—
Net periodic benefit cost	$	7,988	$	8,254
Postretirement Healthcare Benefits:
Service cost	$	1,288	$	1,201
Interest cost	1,626		2,336
Expected return on plan assets	(3,495)		(3,467)
Amortization of unrecognized:
Prior service credit	(581)		(595)
Net loss	264		123
Net periodic benefit cost	$	(898)	$	(402)