Pension and Postretirement Benefits (Tables)

3 Months Ended

Mar. 27, 2016

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

Components of net periodic cost

	Quarter Ended
	Pension				Postretirement
	March 27,		March 29,		March 27,		March 29,
	2016		2015		2016		2015
Service cost	$	998		1,011		132		150
Interest cost		4,606		4,605		294		285
Expected return on assets		(5,507)		(5,479)		-		-
Net amortization and deferrals		2,132		2,201		-		(114)
Net periodic benefit cost	$	2,229		2,338		426		321