Pension and Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

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

Components of net periodic cost

	Quarter Ended
	Pension				Postretirement
	March 31,		April 1,		March 31,		April 1,
	2019		2018		2019		2018
Service cost	$	1,037		685		178		188
Interest cost		2,205		4,016		316		292
Expected return on assets		(2,038)		(5,205)		-		-
Net amortization and deferrals		1,698		2,977		5		42
Net periodic benefit cost	$	2,902		2,473		499		522