Stock-Based Compensation Included in Condensed Consolidated Statement of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3,478	$ 2,353	$ 6,521	$ 6,321
Tax effect on stock-based compensation	0	0	0	0
Total stock-based compensation, net of tax	3,478	2,353	6,521	6,321
Cost of revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	716	758	1,229	1,603
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1,249	951	2,298	2,212
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,513	$ 644	$ 2,994	$ 2,506