Segment Reporting (Schedule Of Revenues By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2011		Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Dec. 31, 2010	Sep. 26, 2010	Jun. 27, 2010	Mar. 28, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic region	$ 236,800	[1]	$ 211,800	$ 221,100	$ 178,500	$ 200,000	$ 168,700	$ 161,200	$ 149,200	$ 848,181	$ 679,111	$ 658,205
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic region										408,307	344,100	373,199
Europe, Middle East And Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic region										275,365	212,998	186,816
LATAM [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic region										102,587	76,205	63,510
ASIAPAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographic region										$ 61,922	$ 45,808	$ 34,680

[1] Includes a $20.9 million tax expense in 2011. For the year ended December 31, 2011, a valuation allowance was required against a portion of our U.S. deferred tax assets and we recorded an increase of $20.9 million in our valuation allowance during the year ended December 31, 2011. This increase was reflected as an expense in the fourth quarter of 2011. There were no similar charges in any of the other years presented.