Employee Benefits (Tables)

6 Months Ended

Jul. 04, 2015

Employee Benefits

Schedule of net periodic benefit cost of plans

	Three Months Ended				Six Months Ended
(Thousands of dollars)	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
Components of net periodic benefit cost:
Service cost	$	2,495	$	2,004	$	4,942	$	3,860
Interest cost	2,587		2,418		5,137		4,821
Expected return on plan assets	(2,173)		(2,179)		(4,288)		(4,364)
Amortization and other	1,377		581		2,126		1,051
Net periodic benefit cost	$	4,286	$	2,824	$	7,917	$	5,368