Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Total revenue	$ 315,830	$ 266,102
Americas:
United States	130,455	112,019
Other Americas	8,124	5,141
Total Americas	138,579	117,160
Total Europe, Middle East and Africa [Member]
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Geographic Areas, Revenue from External Customers Attributed to Individual Foreign Countries	59,709	56,276
Germany [Member]
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Geographic Areas, Revenue from External Customers Attributed to Individual Foreign Countries	13,255	11,725
Other Europe, Middle East and Africa [Member]
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Geographic Areas, Revenue from External Customers Attributed to Individual Foreign Countries	46,454	44,551
Japan [Member]
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Geographic Areas, Revenue from External Customers Attributed to Individual Foreign Countries	56,219	50,165
China [Member]
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Geographic Areas, Revenue from External Customers Attributed to Individual Foreign Countries	16,523	11,634
Other Asia [Member]
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Geographic Areas, Revenue from External Customers Attributed to Individual Foreign Countries	44,800	30,867
Total Asia [Member]
Entity Wide Disclosure on Geographic Areas Revenue from External Customers
Geographic Areas, Revenue from External Customers Attributed to Individual Foreign Countries	$ 61,323	$ 42,501