Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-based compensation expense
Total stock-based compensation expense	$ 50,910	$ 54,002	$ 53,212
Cost of revenues [Member]
Stock-based compensation expense
Total stock-based compensation expense	6,921	7,044	6,600
Research and development [Member]
Stock-based compensation expense
Total stock-based compensation expense	23,646	23,471	22,180
Selling, general and administrative [Member]
Stock-based compensation expense
Total stock-based compensation expense	$ 20,343	$ 23,487	$ 24,432