STOCK PLANS AND SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2013

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, 2013, and June 30, 2012 (in thousands).

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Cost of revenues	$	264	$	256	$	528	$	501
Research and development	1,640		1,566		2,746		2,687
Sales and marketing	795		746		1,624		1,493
General and administrative	1,629		1,074		3,066		1,992
Total stock-based compensation expense	$	4,328	$	3,642	$	7,964	$	6,673

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, 2013.

	June 30, 2013
	Unrecognized Compensation Expense for Unvested Awards			Weighted Average Remaining Recognition Period
	(In thousands)			(In years)
Options		$	2,569		1.88
Performance-based awards		2,013			0.50
Restricted stock units		22,927			2.95
Purchase plan		96			0.50
Total unrecognized compensation expense		$	27,605

Schedule of Share-based Payment Award, Stock Options, 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,
	*2013			2012			*2013			2012
Risk-free interest rates	—		%	1.01		%	—		%	1.01		%
Expected volatility rates	—		%	45		%	—		%	45		%
Expected dividend yield	—		%	0.51		%	—		%	0.51		%
Expected term of stock options (in years)	0			6.4			0			6.4
Weighted-average grant date fair value of options granted	$	—		$	18.31		$	—		$	18.31

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*The Company did not grant stock options in the first six months of 2013, and therefore no fair-value assumptions were reported for those periods.

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,
	2013	2012	2013	2012
Risk-free interest rates	—%	—%	0.11%	0.09%
Expected volatility rates	—%	—%	33%	48%
Expected dividend yield	—%	—%	0.80%	0.54%
Expected term of purchase right (in years)	0	0	0.5	0.5
Weighted-average estimated fair value of purchase rights	$—	$—	$9.14	$10.42

_______________________________

*There were no employee stock purchase rights granted in the three months ended June 30, 2013 and 2012.

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

A summary of stock option activity under the Plans, excluding performance-based awards and restricted stock units, as of June 30, 2013, 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, 2013	2,817		$26.00
Granted	—		—
Exercised	(531	)	$23.94
Forfeited or expired	(19	)	$39.70
Outstanding at June 30, 2013	2,267		$26.37	4.3	$	32,457
Exercisable at June 30, 2013	2,052		$25.00	3.9	$	32,007
Vested and expected to vest at June 30, 2013	2,259		$26.32	4.3	$	32,449

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

A summary of performance-based awards outstanding as of June 30, 2013, 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, 2013	102		$37.60
Granted	101		$38.62
Vested	(54	)	$37.60
Change in units due to performance achievement for PSUs vested in the year	(48	)	$37.60
Forfeited or expired	(2	)	$41.79
Outstanding at June 30, 2013	99		$38.50	0.50	$	4,024
Outstanding and expected to vest at June 30, 2013	87			0.50	$	3,520

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

A summary of RSUs outstanding as of June 30, 2013, 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, 2013	573		$38.21
Granted	353		$38.28
Vested	(176	)	$38.44
Forfeited or expired	(35	)	$39.17
Outstanding at June 30, 2013	715		$38.43	1.85	$	29,017
Outstanding and expected to vest at June 30, 2013	656			1.82	$	26,595