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STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	$ 16,458	$ 13,249	$ 49,604	$ 44,871
Tax benefit	(2,776)		(7,853)
Total stock-based compensation expense, net of income taxes	13,682	13,249	41,751	44,871
Allocated stock-based compensation (credit) related to the Quantum Research Group Ltd. acquisition classified within acquisition-related charges		0		(3,065)
Cost of revenues
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	1,143	2,093	5,783	5,957
Research and development
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	5,557	4,260	16,325	13,845
Selling, general and administrative
Stock-based compensation expense
Total stock-based compensation expense, before income taxes	$ 9,758	$ 6,896	$ 27,496	$ 25,069

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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