STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Total stock-based compensation expense, excluding acquisition-related charges
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	$ 18,229	$ 16,458	$ 56,038	$ 49,604
Tax benefit	(2,403)	(2,776)	(6,624)	(7,853)
Total stock-based compensation expense, net of income taxes	15,826	13,682	49,414	41,751
Cost of revenue
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	2,154	1,143	6,723	5,783
Research and development
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	4,925	5,557	17,568	16,325
Selling, general and administrative
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	$ 11,150	$ 9,758	$ 31,747	$ 27,496