Postretirement benefits other than pension (Tables) (Other Postretirement Benefit Plans, Defined Benefit [Member])

6 Months Ended

Jun. 30, 2013

Other Postretirement Benefit Plans, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Postretirement benefit costs for health care and life insurance

Postretirement benefit costs for health care and life insurance are presented in the following table:

In thousands of dollars	Thirteen Weeks Ended						Twenty-six Weeks Ended
	Jun. 30, 2013			Jun. 24, 2012			Jun. 30, 2013			Jun. 24, 2012
Service cost-benefits earned during the period	$	89		$	98		$	264		$	273
Interest cost on net benefit obligation	1,303			1,822			2,828			3,872
Amortization of prior service credit	(2,282		)	(4,795		)	(4,582		)	(9,595		)
Amortization of actuarial loss	85			322			585			972
Net periodic postretirement benefit credit	$	(805	)	$	(2,553	)	$	(905	)	$	(4,478	)