Retirement Plans - (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Domestic Plans
Net Periodic periodic pension cost
Service cost	$ 208	$ 93	$ 564	$ 465
Interest cost	771	777	2,292	2,321
Expected return on plan assets	(792)	(853)	(2,418)	(2,543)
Amortization of unrecognized:
Prior service cost	0	0	0	0
Cumulative net loss	(1)	0	3	0
Net periodic benefit cost	186	17	441	243
Foreign Plans
Net Periodic periodic pension cost
Service cost	611	628	1,814	1,928
Interest cost	990	927	2,940	2,843
Expected return on plan assets	(940)	(974)	(2,791)	(2,988)
Amortization of unrecognized:
Prior service cost	5	0	16	0
Cumulative net loss	12	0	34	0
Net periodic benefit cost	$ 678	$ 581	$ 2,013	$ 1,783