Pensions and Other Postretirement Benefits (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
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	$ 864	$ 800	$ 2,621	$ 2,425
Interest cost	2,022	2,289	6,076	7,007
Expected return on plan assets	(510)	(416)	(1,559)	(1,242)
Amortization of prior service cost (credit)	(9)	0	(26)	0
Amortization of losses (gains)	832	409	2,499	1,243
Net periodic benefit cost	3,199	3,082	9,611	9,433
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	0	0	0	0
Interest cost	3,471	3,925	10,412	11,775
Expected return on plan assets	(4,781)	(4,743)	(14,343)	(14,229)
Amortization of prior service cost (credit)	244	550	733	1,650
Amortization of losses (gains)	3,733	3,142	11,198	9,427
Net periodic benefit cost	2,667	2,874	8,000	8,623
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	28	19	83	55
Interest cost	78	130	235	391
Amortization of transition obligation	0	8	0	24
Amortization of prior service cost (credit)	(200)	(101)	(599)	(305)
Amortization of losses (gains)	1	(24)	3	(72)
Net periodic benefit cost	(93)	32	(278)	93
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	74	62	222	189
Interest cost	64	70	191	214
Amortization of transition obligation	0	0	0	0
Amortization of prior service cost (credit)	0	0	0	0
Amortization of losses (gains)	0	0	0	0
Net periodic benefit cost	$ 138	$ 132	$ 413	$ 403