Employee Benefit Plans (Tables)

9 Months Ended

Sep. 29, 2019

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Costs

Components of net periodic benefit cost were as follows (in thousands):

	Three months ended						Nine months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Pension and SERPA Benefits:
Service cost	$	6,072		$	8,063		$	19,336		$	24,281
Interest cost	21,371			20,729			64,113			62,048
Expected return on plan assets	(35,581		)	(36,925		)	(106,743		)	(110,742		)
Amortization of unrecognized:
Prior service credit	(483		)	(105		)	(1,449		)	(316		)
Net loss	11,128			16,318			33,384			48,455
Settlement loss	1,500			—			1,500			—
Curtailment loss	—			—			—			1,018
Net periodic benefit cost	$	4,007		$	8,080		$	10,141		$	24,744

	Three months ended						Nine months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Postretirement Healthcare Benefits:
Service cost	$	1,040		$	1,789		$	3,409		$	5,390
Interest cost	2,938			2,886			8,814			8,669
Expected return on plan assets	(3,507		)	(3,541		)	(10,521		)	(10,623		)
Amortization of unrecognized:
Prior service credit	(595		)	(460		)	(1,785		)	(1,380		)
Net loss	69			454			207			1,362
Special retirement benefit cost	—			—			1,583			—
Curtailment gain	—			—			(960		)	—
Net periodic benefit cost	$	(55	)	$	1,128		$	747		$	3,418