STOCK PLANS AND SHARE-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2013, and September 30, 2012 (in thousands).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Cost of revenues	$	296	$	271	$	824	$	772
Research and development	1,485		1,467		4,231		4,154
Sales and marketing	964		940		2,588		2,433
General and administrative	1,446		1,169		4,512		3,161
Total stock-based compensation expense	$	4,191	$	3,847	$	12,155	$	10,520

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, 2013.

	September 30, 2013
	Unrecognized Compensation Expense for Unvested Awards			Weighted Average Remaining Recognition Period
	(In thousands)			(In years)
Options		$	2,204		1.68
Performance-based awards		928			0.25
Restricted stock units		20,665			2.66
Purchase plan		439			0.50
Total unrecognized compensation expense		$	24,236

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		Nine Months Ended
	September 30,		September 30,
	*2013	2012	*2013	2012
Risk-free interest rates	—%	0.87%	—%	1.01% - 0.87%
Expected volatility rates	—%	45%	—%	45%
Expected dividend yield	—%	0.57%	—%	0.51% - 0.57%
Expected term of stock options (in years)	0	6.4	0	6.4
Weighted-average grant date fair value of options granted	$—	$16.00	$—	$18.20

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*The Company did not grant stock options in the nine months ended September 30, 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		Nine Months Ended
	September 30,		September 30,
	2013	2012	2013	2012
Risk-free interest rates	0.08%	0.14%	0.08% - 0.11%	0.09% - 0.14%
Expected volatility rates	37%	34%	33% - 37%	34% - 48%
Expected dividend yield	0.62%	0.57%	0.62% - 0.80%	0.54% - 0.57%
Expected term of purchase right (in years)	0.5	0.5	0.5	0.5
Weighted-average estimated fair value of purchase rights	$13.87	$8.55	$11.01	$9.40

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 September 30, 2013, 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, 2013	2,817		$26.00
Granted	—		—
Exercised	(1,019	)	$23.28
Forfeited or expired	(18	)	$39.70
Outstanding at September 30, 2013	1,780		$27.41	4.59	$	47,601
Exercisable at September 30, 2013	1,598		$26.02	4.21	$	44,974
Vested and expected to vest at September 30, 2013	1,774		$27.37	4.58	$	47,528

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

A summary of performance-based awards outstanding as of September 30, 2013, 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, 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 September 30, 2013	99		$38.50	0.25	$	5,373
Outstanding and expected to vest at September 30, 2013	80			0.25	$	4,335

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

A summary of RSUs outstanding as of September 30, 2013, 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, 2013	573		$38.21
Granted	371		$38.52
Vested	(185	)	$38.10
Forfeited or expired	(43	)	$39.35
Outstanding at September 30, 2013	716		$38.63	1.58	$	38,780
Outstanding and expected to vest at September 30, 2013	664			1.57	$	35,968