Segment Information (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2011 customers years	Oct. 01, 2010 customers years	Sep. 30, 2011 years employees customers companies	Oct. 01, 2010 years
Segment Reporting Information [Line Items]
Number Of Customers With Greater Than Ten Percent Of Total Revenue	0	1	0	1
Customers Revenue As A Percentage Of Total Revenue		14.00%		12.00%