STOCK PLANS AND SHARE BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2011

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation Expense [Table Text Block]

The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three and nine months ended September 30, 2011 and September 30, 2010 (in thousands).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Cost of revenues	$	128	$	153	$	584	$	481
Research and development	564		1,125		2,354		2,782
Sales and marketing	449		727		1,659		1,776
General and administrative	527		930		2,020		2,438
Total stock-based compensation expense	$	1,668	$	2,935	$	6,617	$	7,477

Fair Value Assumptions for Stock Options Granted [Table Text Block]

The fair value of stock options granted is established on the date of the grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2011	2010	2011	2010
Risk-free interest rates	1.46%	1.53%	1.46% - 2.20%	1.53% - 2.25%
Expected volatility rates	44%	45%	44%	45% - 48%
Expected dividend yield	0.59%	0.62%	0.54% - 0.59%	0.54% - 0.62%
Expected term of stock options (in years)	6.00	5.12	6.00	5.12
Weighted-average grant date fair value of options granted	$15.58	$12.61	$15.66	$14.82

Fair Value Assumptions for Employees' Stock Purchase Rights Under the Purchase Plan [Table Text Block]

The fair value of employees’ stock purchase rights under the Purchase Plan was estimated using the Black-Scholes model with the following weighted-average assumptions:

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2011	2010	2011	2010
Risk-free interest rates	0.16%	0.20%	0.16% - 0.17%	0.17% - 0.20%
Expected volatility rates	37%	43%	37%	36% - 43%
Expected dividend yield	0.59%	0.62%	0.51% - 0.59%	0.34% - 0.62%
Expected term of purchase right (years)	0.50	0.50	0.50	0.50
Weighted-average estimated fair value of purchase rights	$8.93	$9.49	$9.15	$8.65

Summary of Option Activity Under the Plans [Table Text Block]

A summary of stock option activity under the Plans, excluding performance-based shares and restricted stock units, as of September 30, 2011, and changes during the nine months then ended, is presented below:

	Shares (in thousands)		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2011	4,433		$	22.68
Granted	164		37.37
Exercised	(734	)	19.63
Forfeited or expired	(63	)	25.02
Outstanding at September 30, 2011	3,800		$	23.87	4.83	$	27,924
Exercisable at September 30, 2011	3,119		$	22.90	4.08	$	24,599
Vested and expected to vest at September 30, 2011	3,760		$	23.76	4.79	$	27,854

Summary of Performance-based Awards Activity [Table Text Block]

A summary of performance-based awards outstanding as of September 30, 2011, and activity during the nine months then ended, is presented below:

	Shares (in thousands)		Weighted- Average Grant Date Fair Value Per Share		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2011	85		$	34.97
Granted	98		36.57
Vested	(85	)	34.97
Forfeited or expired	(6	)	36.61
Outstanding at September 30, 2011	92		$	36.57	0.25	$	2,817
Vested and expected to vest at September 30, 2011	—				0.25	$	—

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

A summary of RSUs outstanding as of September 30, 2011, and changes during the nine months then ended, is as follows:

	Shares (in thousands)		Weighted- Average Grant Date Fair Value Per Share		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2011	260		$	36.30
Granted	253		36.16
Vested	(58	)	36.30
Forfeited or expired	(25	)	37.28
Outstanding at September 30, 2011	430		$	36.16	1.89	$	13,154
Outstanding and expected to vest at September 30, 2011	379				1.87	$	11,591