Employee Benefit Plans (Tables)

3 Months Ended

Mar. 29, 2020

Retirement Benefits [Abstract]

Components of net periodic benefit cost

The components of net periodic benefit cost include the following:

	Three Months Ended
	March 29, 2020		March 31, 2019
Retirement Plans
Service cost	$	1,082	$	941
Interest cost	12,681		14,943
Expected return on plan assets	(12,580)		(19,097)
Amortization of prior service cost	250		214
Amortization of net actuarial loss	6,876		9,034
Effect of settlement loss	623		1,322
Net periodic benefit cost	$	8,932	$	7,357
Retiree Health and Life Insurance Plans
Service cost	$	83	$	74
Interest cost	84		118
Expected return on plan assets	(90)		(177)
Amortization of prior service credit	(68)		(123)
Amortization of net actuarial gain	(197)		(193)
Net periodic benefit income	$	(188)	$	(301)