Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2017

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Costs for Pension and Other Postretirement Benefits

The components of net periodic benefit costs (credits) for pension and other postretirement benefits, for Company sponsored plans, are provided below (in thousands):

	13-Weeks Ended
	Pension Benefits						Other Postretirement Benefits
	September 30, 2017			October 1, 2016			September 30, 2017			October 1, 2016
Components of Net periodic benefit costs (credits)
Service cost	$	755		$	962		$	7		$	9
Interest cost		9,329			10,114			68			73
Expected return on plan assets		(11,943	)		(12,072	)		—			—
Amortization of prior service cost		35			39			2			2
Amortization of net loss (gain)		785			2,063			(86	)		(17	)
Settlements		1,000			750			—			—
Net periodic benefit costs (credits)	$	(39	)	$	1,856		$	(9	)	$	67
	39-Weeks Ended
	Pension Benefits						Other Postretirement Benefits
	September 30, 2017			October 1, 2016			September 30, 2017			October 1, 2016
Components of Net periodic benefit costs
Service cost	$	1,767		$	2,887		$	26		$	28
Interest cost		29,606			30,344			212			221
Expected return on plan assets		(35,871	)		(36,220	)		—			—
Amortization of prior service cost		104			118			5			5
Amortization of net loss (gain)		2,886			6,191			(112	)		(53	)
Settlements		3,000			2,250			—			—
Net periodic benefit costs	$	1,492		$	5,570		$	131		$	201