Pensions and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	$ 831	$ 872	$ 1,655	$ 1,757
Interest cost	2,195	2,012	4,376	4,054
Expected return on plan assets	(532)	(520)	(1,057)	(1,049)
Amortization of prior service cost (credit)	1	(8)	2	(17)
Amortization of losses (gains)	691	828	1,378	1,667
Net periodic benefit cost	3,186	3,184	6,354	6,412
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	0	0	0	0
Interest cost	3,834	3,474	7,668	6,941
Expected return on plan assets	(4,058)	(4,586)	(8,116)	(9,562)
Amortization of prior service cost (credit)	(23)	245	(46)	489
Amortization of losses (gains)	1,810	3,507	3,620	7,465
Net periodic benefit cost	1,563	2,640	3,126	5,333
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	29	27	58	55
Interest cost	88	79	176	157
Amortization of prior service cost (credit)	(206)	(199)	(412)	(399)
Amortization of losses (gains)	(35)	1	(70)	2
Net periodic benefit cost	(124)	(92)	(248)	(185)
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	79	74	158	148
Interest cost	63	63	126	127
Amortization of prior service cost (credit)	0	0	0	0
Amortization of losses (gains)	10	0	20	0
Net periodic benefit cost	$ 152	$ 137	$ 304	$ 275