Pension and Postretirement Benefits (Tables)

6 Months Ended

Jun. 26, 2016

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

Components of net periodic cost

	Quarter Ended
	Pension				Postretirement
	June 26,		June 28,		June 26,		June 28,
	2016		2015		2016		2015
Service cost	$	995		1,021		133		150
Interest cost		4,604		4,619		293		285
Expected return on assets		(5,504)		(5,497)		-		-
Net amortization and deferrals		2,132		2,207		-		(114)
Curtailment		-		138		-		-
Net periodic benefit cost	$	2,227		2,488		426		321

	Six Months Ended
	Pension				Postretirement
	June 26,		June 28,		June 26,		June 28,
	2016		2015		2016		2015
Service cost	$	1,993		2,032		265		300
Interest cost		9,210		9,224		587		570
Expected return on assets		(11,011)		(10,976)		-		-
Net amortization and deferrals		4,264		4,408		-		(228)
Curtailment		-		138		-		-
Net periodic benefit cost	$	4,456		4,826		852		642