STOCK PLANS AND SHARE-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2012

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, 2012, and September 30, 2011 (in thousands).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Cost of revenues	$	271	$	128	$	772	$	584
Research and development	1,467		564		4,154		2,354
Sales and marketing	940		449		2,433		1,659
General and administrative	1,169		527		3,161		2,020
Total stock-based compensation expense	$	3,847	$	1,668	$	10,520	$	6,617

Schedule of Unrecognized Compensation Expense for Unvested Awards [Table Text Block]

The following table summarizes total compensation expense related to unvested awards not yet recognized, net of expected forfeitures, and the weighted average period over which it is expected to be recognized as of September 30, 2012.

	September 30, 2012
	Unrecognized Compensation Expense for Unvested Awards			Weighted Average Remaining Recognition Period
	(In thousands)			(In years)
Options		$	4,500		2.01
Performance-based awards		700			0.25
Restricted stock units		17,100			2.67
Purchase plan		400			0.50
Total unrecognized compensation expense		$	22,700

Schedule of Share-based Payment Award, Stock Options Granted, Valuation Assumptions [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,
	2012		2011	2012	2011
Risk-free interest rates	0.87	%	1.46%	1.01% - 0.87%	1.46% - 2.20%
Expected volatility rates	45	%	44%	45%	44%
Expected dividend yield	0.57	%	0.59%	0.51% - 0.57%	0.54% - 0.59%
Expected term of stock options (in years)	6.40		6.00	6.40	6.00
Weighted-average grant date fair value of options granted	$16.00		$15.58	$18.20	$15.66

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [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,
	2012	2011	2012	2011
Risk-free interest rates	0.14%	0.16%	0.09% - 0.14%	0.16% - 0.17%
Expected volatility rates	34%	37%	34% - 48%	37%
Expected dividend yield	0.57%	0.59%	0.54% - 0.57%	0.51% - 0.59%
Expected term of purchase right (in years)	0.50	0.50	0.50	0.50
Weighted-average estimated fair value of purchase rights	$8.55	$8.93	$9.40	$9.15

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, 2012, 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, 2012	3,557		$	24.01
Granted	135		42.66
Exercised	(663	)	20.85
Forfeited or expired	(5	)	21.09
Outstanding at September 30, 2012	3,024		$	25.54	4.39	$	18,744
Exercisable at September 30, 2012	2,573		$	23.88	3.71	$	17,876
Vested and expected to vest at September 30, 2012	3,003		$	25.44	4.36	$	18,741

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

A summary of performance-based awards outstanding as of September 30, 2012, 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, 2012	—	$	—
Granted	102	37.60
Vested	—	—
Forfeited or expired	—	—
Outstanding at September 30, 2012	102	$	37.60	0.25	$	3,091
Outstanding and expected to vest at September 30, 2012	62			0.25	$	1,895

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

A summary of RSUs outstanding as of September 30, 2012, 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, 2012	458		$	36.08
Granted	281		41.54
Vested	(113	)	36.33
Forfeited or expired	(17	)	36.99
Outstanding at September 30, 2012	609		$	37.59	1.62	$	18,534
Outstanding and expected to vest at September 30, 2012	563				1.60	$	17,139