Employee Benefit Plans (Tables)

9 Months Ended

Sep. 26, 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				Nine months ended
	September 26, 2021		September 27, 2020		September 26, 2021		September 27, 2020
Pension and SERPA Benefits:
Service cost	$	6,348	$	6,806	$	19,044	$	20,418
Interest cost	15,472		19,112		46,412		57,335
Expected return on plan assets	(32,720)		(33,764)		(98,160)		(101,292)
Amortization of unrecognized:
Prior service credit	(312)		(272)		(936)		(816)
Net loss	18,386		16,372		55,158		49,116
Settlement loss	—		—		816		—
Net periodic benefit cost	$	7,174	$	8,254	$	22,334	$	24,761
Postretirement Healthcare Benefits:
Service cost	$	1,288	$	1,202	$	3,864	$	3,605
Interest cost	1,626		2,336		4,878		7,008
Expected return on plan assets	(3,495)		(3,467)		(10,485)		(10,401)
Amortization of unrecognized:
Prior service credit	(581)		(595)		(1,743)		(1,785)
Net loss	264		123		792		369
Net periodic benefit cost	$	(898)	$	(401)	$	(2,694)	$	(1,204)