Retirement Plans - (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Domestic Plans
Net periodic benefit cost:
Service cost	$ 239	$ 208	$ 774	$ 564
Interest cost	735	771	2,177	2,292
Expected return on plan assets	(887)	(792)	(2,661)	(2,418)
Amortization of unrecognized:
Prior service cost	0	0	0	0
Cumulative actuarial net loss	82	(1)	180	3
Net periodic benefit cost	169	186	470	441
Foreign Plans
Net periodic benefit cost:
Service cost	698	611	2,119	1,814
Interest cost	937	990	2,844	2,940
Expected return on plan assets	(970)	(940)	(2,946)	(2,791)
Amortization of unrecognized:
Prior service cost	5	5	15	16
Cumulative actuarial net loss	130	12	394	34
Net periodic benefit cost	800	678	2,426	2,013
OPEB Plans
Net periodic benefit cost:
Service cost	2	2	9	9
Interest cost	39	52	138	175
Expected return on plan assets	0	0	0	0
Amortization of unrecognized:
Prior service cost	0	0	0	0
Cumulative actuarial net loss	(10)	0	(6)	0
Net periodic benefit cost	$ 31	$ 54	$ 141	$ 184