STOCK PLANS AND SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2012 and June 30, 2011 (in thousands).

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2012		2011		2012		2011
Cost of revenues	$	256	$	216	$	501	$	455
Research and development	1,566		980		2,687		1,791
Sales and marketing	746		543		1,493		1,210
General and administrative	1,074		705		1,992		1,492
Total stock-based compensation expense	$	3,642	$	2,444	$	6,673	$	4,948

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 June 30, 2012.

	June 30, 2012
	Unrecognized Compensation Expense for Unvested Awards			Weighted Average Remaining Recognition Period
	(In thousands)			(In years)
Options		$	5,406		2.09
Performance-based awards		$	1,705		0.50
Restricted stock units		$	18,964		2.95
Purchase plan		$	100		0.50

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						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Risk-free interest rates	1.01		%	2.20		%	1.01		%	2.20		%
Expected volatility rates	45		%	44		%	45		%	44		%
Expected dividend yield	0.51		%	0.54		%	0.51		%	0.54		%
Expected term of stock options (in years)	6.4			6.0			6.4			6.0
Weighted-average grant date fair value of options granted	$	18.31		$	15.71		$	18.31		$	15.71

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		Six Months Ended
	June 30,		June 30,
	2012	2011	2012	2011
Risk-free interest rates	—%	—%	0.09%	0.17%
Expected volatility rates	—%	—%	48%	37%
Expected dividend yield	—%	—%	0.54%	0.51%
Expected term of purchase right (in years)	—	—	0.50	0.50
Weighted-average estimated fair value of purchase rights	$—	$—	$10.42	$9.40

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 June 30, 2012, and changes during the six 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	129		42.88
Exercised	(584	)	20.49
Forfeited or expired	(3	)	21.09
Outstanding at June 30, 2012	3,099		$	25.46	4.59	$	37,602
Exercisable at June 30, 2012	2,576		$	23.82	3.83	$	34,766
Vested and expected to vest at June 30, 2012	3,073		$	25.34	4.55	$	37,575

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

A summary of performance-based awards outstanding as of June 30, 2012, and activity during the six 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 June 30, 2012	102	$	37.60	0.5	$	3,797
Outstanding and expected to vest at June 30, 2012	79			0.5	$	2,986

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

A summary of RSUs outstanding as of June 30, 2012, and changes during the six 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	261		41.88
Vested	(106	)	36.41
Forfeited or expired	(9	)	36.72
Outstanding at June 30, 2012	604		$	38.52	1.86	$	22,541
Outstanding and expected to vest at June 30, 2012	553				1.84	$	20,630