Employee Benefits (Tables)

9 Months Ended

Oct. 03, 2015

Employee Benefits

Schedule of net periodic benefit cost of plans

	Three Months Ended				Nine Months Ended
	October 3,		September 27,		October 3,		September 27,
(Thousands of dollars)	2015		2014		2015		2014
Components of net periodic benefit cost:
Service cost	$	2,500	$	1,924	$	7,442	$	5,784
Interest cost		2,592		2,404		7,729		7,225
Expected return on plan assets		(2,179)		(2,173)		(6,467)		(6,537)
Amortization and other		1,379		524		3,505		1,575
Net periodic benefit cost	$	4,292	$	2,679	$	12,209	$	8,047