Employee Benefit Plans (Tables)

3 Months Ended

Mar. 27, 2016

Compensation and Retirement Disclosure [Abstract]

Components Of Net Periodic Benefit Costs

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

	Three months ended
	March 27, 2016			March 29, 2015
Pension and SERPA Benefits
Service cost	$	8,359		$	10,010
Interest cost	22,707			21,836
Expected return on plan assets	(36,445		)	(36,232		)
Amortization of unrecognized:
Prior service cost	255			109
Net loss	11,587			13,677
Settlement loss	300			—
Net periodic benefit cost	$	6,763		$	9,400
Postretirement Healthcare Benefits
Service cost	$	1,870		$	2,065
Interest cost	3,704			3,541
Expected return on plan assets	(3,017		)	(2,877		)
Amortization of unrecognized:
Prior service credit	(701		)	(804		)
Net loss	884			993
Net periodic benefit cost	$	2,740		$	2,918