Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 25, 2016

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

Components of net periodic cost

	Quarter Ended
	Pension				Postretirement
	September 25,		September 27,		September 25,		September 27,
	2016		2015		2016		2015
Service cost	$	1,002		1,006		132		150
Interest cost		4,611		4,603		294		285
Expected return on assets		(5,512)		(5,476)		-		-
Net amortization and deferrals		2,134		2,202		-		(114)
Curtailment		-		643		-		(3,842)
Net periodic benefit cost	$	2,235		2,978		426		(3,521)

	Nine Months Ended
	Pension				Postretirement
	September 25,		September 27,		September 25,		September 27,
	2016		2015		2016		2015
Service cost	$	2,995		3,038		397		450
Interest cost		13,821		13,827		881		855
Expected return on assets		(16,523)		(16,452)		-		-
Net amortization and deferrals		6,398		6,610		-		(341)
Curtailment		-		781		-		(3,842)
Net periodic benefit cost	$	6,691		7,804		1,278		(2,878)