Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Employee Benefits

Schedule of net periodic cost of benefits of plans

	Three Months Ended
	March 31,		April 2,
(Thousands of dollars)	2012		2011
Components of net periodic benefit cost:
Service cost	$  2,226		$  1,927
Interest cost	2,258		2,294
Expected return on plan assets	(1,592	)	(1,635	)
Amortization and other	1,530		1,051
Net periodic benefit cost	$  4,422		$  3,637