Operating Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Operating Segment Information
External customer revenues	$ 464,291	$ 461,628
Operating income	43,965	42,073
Operating Segments [Member]
Operating Segment Information
External customer revenues	464,291	461,628
Affiliate revenues	38,180	34,835
Reportable Segment [Member]
Operating Segment Information
Operating income	58,362	51,169
Americas [Member]
Operating Segment Information
External customer revenues	299,622	276,998
Affiliate revenues	10,086	12,068
Operating income	36,278	31,117
EMEA [Member]
Operating Segment Information
External customer revenues	94,129	103,690
Affiliate revenues	27,488	22,666
Operating income	17,415	13,769
Asia Pacific [Member]
Operating Segment Information
External customer revenues	70,540	80,940
Affiliate revenues	606	101
Operating income	$ 4,669	$ 6,283