STOCKHOLDERS' EQUITY 2 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Total stock-based compensation expense, excluding acquisition-related charges
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	$ 14,762	$ 19,327
Tax benefit	(2,606)	(2,790)
Total stock-based compensation expense, net of income taxes	12,156	16,537
Cost of revenues
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	1,844	2,255
Research and development
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	4,608	6,763
Selling, general and administrative
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	$ 8,310	$ 10,309