Pension and Postretirement Benefits (Tables)

3 Months Ended

Apr. 01, 2018

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

Components of net periodic cost

	Quarter Ended
	Pension				Postretirement
	April 1,		April 2,		April 1,		April 2,
	2018		2017		2018		2017
Service cost	$	685		952		188		172
Interest cost		4,016		4,725		292		295
Expected return on assets		(5,205)		(6,281)		-		-
Net amortization and deferrals		2,977		2,694		42		-
Net periodic benefit cost	$	2,473		2,090		522		467