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

9 Months Ended

Sep. 29, 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						Thirty-nine Weeks Ended
	Sept. 29, 2013			Sept. 23, 2012			Sept. 29, 2013			Sept. 23, 2012
Service cost-benefits earned during the period	$	132		$	136		$	396		$	409
Interest cost on net benefit obligation	1,414			1,936			4,242			5,808
Amortization of prior service credit	(2,291		)	(4,797		)	(6,873		)	(14,392		)
Amortization of actuarial loss	292			486			877			1,458
Net periodic postretirement benefit credit	$	(453	)	$	(2,239	)	$	(1,358	)	$	(6,717	)