Benefit Plans (Details 4) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Stock-based compensation costs
Total employee stock-based compensation expense	$ 5,005	$ 3,518	$ 16,099	$ 10,180
Amount capitalized as inventory		(14)		11
Total stock-based compensation	5,005	3,504	16,099	10,191
Total employee stock-based compensation in operating expense [Member]
Stock-based compensation costs
Total employee stock-based compensation expense	4,162	3,002	13,747	8,659
Research and Development Expense [Member]
Stock-based compensation costs
Total employee stock-based compensation expense	1,658	1,169	5,265	3,435
Selling general and administrative expense [Member]
Stock-based compensation costs
Total employee stock-based compensation expense	2,504	1,833	8,482	5,224
Cost of Revenue [Member]
Stock-based compensation costs
Total employee stock-based compensation expense	$ 843	$ 516	$ 2,352	$ 1,521