Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

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

Components of net periodic cost

	Quarter Ended
	--------------------
	Pension		Postretirement
	------------------		------------------
	Sept. 30, 2012	Sept. 25, 2011	Sept. 30, 2012	Sept. 25, 2011
	-------	-------	-------	-------
Service cost	$  1,001	1,023	183	171
Interest cost	5,104	5,144	440	440
Expected return on assets	(5,377)	(6,172)	-	-
Net amortization and deferrals	1,788	1,288	20	18
Curtailment loss	673	-	-	-
	--------	--------	--------	--------
Net periodic benefit cost	$  3,189	1,283	643	629
	=====	=====	=====	=====

	Nine Months Ended
	-----------------------------
	Pension		Postretirement
	------------------		------------------
	Sept. 30, 2012	Sept. 25, 2011	Sept. 30, 2012	Sept. 25, 2011
	-------	-------	-------	-------
Service cost	$  3,280	3,192	551	513
Interest cost	15,650	15,598	1,320	1,320
Expected return on assets	(16,280)	(18,679)	-	-
Net amortization and deferrals	5,457	3,878	60	54
Curtailment loss	673	-	-	-
	--------	--------	--------	--------
Net periodic benefit cost	$  8,780	3,989	1,931	1,887
	=====	=====	=====	=====