Pensions and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	$ 872	$ 811	$ 1,757	$ 1,625
Interest cost	2,012	2,344	4,054	4,718
Expected return on plan assets	(520)	(414)	(1,049)	(826)
Amortization of prior service cost (credit)	(8)	0	(17)	0
Amortization of gains (losses)	828	416	1,667	834
Net periodic benefit cost	3,184	3,157	6,412	6,351
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	0	0	0	0
Interest cost	3,474	3,923	6,941	7,850
Expected return on plan assets	(4,586)	(4,770)	(9,562)	(9,486)
Amortization of prior service cost (credit)	245	550	489	1,100
Amortization of gains (losses)	3,507	3,174	7,465	6,285
Net periodic benefit cost	2,640	2,877	5,333	5,749
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	27	18	55	36
Interest cost	79	131	157	261
Amortization of transition obligation	0	8	0	16
Amortization of prior service cost (credit)	(199)	(102)	(399)	(204)
Amortization of gains (losses)	1	(26)	2	(48)
Net periodic benefit cost	(92)	29	(185)	61
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	74	63	148	127
Interest cost	63	71	127	144
Amortization of transition obligation	0	0	0	0
Amortization of prior service cost (credit)	0	0	0	0
Amortization of gains (losses)	0	0	0	0
Net periodic benefit cost	$ 137	$ 134	$ 275	$ 271