Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2018

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

Components of net periodic cost

	Quarter Ended
	Pension				Postretirement
	September 30,		October 1,		September 30,		October 1,
	2018		2017		2018		2017
Service cost	$	678		925		189		172
Interest cost		3,997		4,443		292		295
Expected return on assets		(5,190)		(5,896)		-		-
Net amortization and deferrals		2,971		2,525		42		-
Net periodic benefit cost	$	2,456		1,997		523		467

	Nine Months Ended
	Pension				Postretirement
	September 30,		October 1,		September 30,		October 1,
	2018		2017		2018		2017
Service cost	$	2,030		2,798		566		517
Interest cost		11,993		13,598		877		885
Expected return on assets		(15,569)		(18,057)		-		-
Net amortization and deferrals		8,913		7,738		127		-
Net periodic benefit cost	$	7,367		6,077		1,570		1,402