Pension and Postretirement Benefits (Tables)

3 Months Ended

6 Months Ended

Jul. 01, 2012

Jul. 01, 2012

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

Components of net periodic cost

	Quarter Ended
	--------------------
	Pension		Postretirement
	------------------		------------------
	July 1, 2012	June 26, 2011	July 1, 2012	June 26, 2011
	-------	-------	-------	-------
Service cost	$  1,081	1,090	184	171
Interest cost	5,052	5,231	440	440
Expected return on assets	(5,232)	(6,258)	-	-
Net amortization and deferrals	1,761	1,295	20	18
	--------	--------	--------	--------
Net periodic benefit cost	$  2,662	1,358	644	629
	=====	=====	=====	=====

	Six Months Ended
	------------------
	Pension		Postretirement
	------------------		------------------
	July 1, 2012	June 26, 2011	July 1, 2012	June 26, 2011
	-------	-------	-------	-------
Service cost	$  2,279	2,169	368	342
Interest cost	10,546	10,454	880	880
Expected return on assets	(10,903)	(12,507)	-	-
Net amortization and deferrals	3,669	2,590	40	36
	--------	--------	--------	--------
Net periodic benefit cost	$  5,591	2,706	1,288	1,258
	=====	=====	=====	=====