Pension, Postretirement and Postemployment Benefits (Tables)

3 Months Ended

9 Months Ended

Sep. 25, 2011

Sep. 25, 2011

Pension, Postretirement and Postemployment Benefits (Thousands of Dollars) [Abstract]

Components of net periodic cost

	Quarter Ended
	--------------------
	Pension		Postretirement
	------------------		------------------
	Sept. 25, 2011	Sept. 26, 2010	Sept. 25, 2011	Sept. 26, 2010
	-------	-------	-------	-------
Service cost	$    1,023	1,108	171	153
Interest cost	5,144	5,183	440	450
Expected return on assets	(6,172)	(6,112)	-	-
Net amortization and deferrals	1,288	1,074	18	-
	--------	--------	--------	--------
Net periodic benefit cost	$    1,283	1,253	629	603
	=====	=====	=====	=====

	Nine Months Ended
	------------------
	Pension		Postretirement
	------------------		------------------
	Sept. 25, 2011	Sept. 26, 2010	Sept. 25, 2011	Sept. 26, 2010
	-------	-------	-------	-------
Service cost	$    3,192	3,235	513	458
Interest cost	15,598	15,590	1,320	1,350
Expected return on assets	(18,679)	(18,337)	-	-
Net amortization and deferrals	3,878	3,262	54	-
	--------	--------	--------	--------
Net periodic benefit cost	$    3,989	3,750	1,887	1,808
	=====	=====	=====	=====