STOCK PLANS AND SHARE BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2011

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

Summary of 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 twelve months ended December 31, 2011, December 31, 2010 and December 31, 2009 (in thousands).

	Year Ended December 31,
	2011		2010		2009
Cost of revenues	$	666	$	686	$	790
Research and development	3,274		4,107		4,371
Sales and marketing	2,313		2,594		2,548
General and administrative	2,716		3,334		3,619
Total stock-based compensation expense	$	8,969	$	10,721	$	11,328

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 used during the three years ended December 31, 2011, 2010 and 2009:

	2011	2010	2009
Risk-free interest rates	1.46% - 2.20%	1.53% - 2.25%	1.76% - 2.47%
Expected volatility rates	44%	45% - 48%	39% - 48%
Expected dividend yield	0.54% - 0.59%	0.54% - 0.62%	0.34% - 0.52%
Expected term of stock options (in years)	6.00	5.12	5.01
Weighted-average grant date fair value of options granted	$15.66	$14.82	$8.53

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 used during the three years ended December 31, 2011, 2010 and 2009:

	2011	2010	2009
Risk-free interest rates	0.16% - 0.17%	0.17% - 0.20%	0.28% - 0.39%
Expected volatility rates	37%	36% - 43%	35% - 56%
Expected dividend yield	0.51% - 0.59%	0.52% - 0.55%	0.34% - 0.52%
Expected term of purchase right (years)	0.5	0.5	0.5
Weighted-average estimated fair value of purchase rights	$9.15	$8.65	$7.03

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 December 31, 2011, and changes during three years 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, 2009	5,981		$	21.38
Granted	877		$	21.28
Exercised	(930	)	$	17.93
Forfeited or expired	(204	)	$	30.75
Outstanding at December 31, 2009	5,724		$	21.65
Granted	218		$	35.46
Exercised	(1,263	)	$	18.15
Forfeited or expired	(246	)	$	33.25
Outstanding at December 31, 2010	4,433		$	22.68
Granted	164		$	37.37
Exercised	(948	)	$	19.82
Forfeited or expired	(92	)	$	27.07
Outstanding at December 31, 2011	3,557		$	24.01	4.65	$	33,728
Exercisable at December 31, 2011	2,997		$	23.13	4.02	$	30,332
Vested and expected to vest at December 31, 2011	3,528		$	23.92	4.62	$	33,672

Summary of stock options outstanding by exercise price range [Table Text Block]

The following table summarizes the stock options outstanding at December 31, 2011:

Options Outstanding				Options Vested and Exercisable
Exercise Price	Number Outstanding	Weighted Average Remaining Contractual Term (in years)	Weighted Average Exercise Price	Number Vested	Weighted Average Exercise Price
$12.19-$17.12	52,011	0.81	$14.64	51,094	$14.59
$17.18-$17.18	434,149	3.07	$17.18	434,149	$17.18
$17.32-$18.95	376,034	2.12	$18.43	372,874	$18.44
$19.02-$21.11	321,780	4.83	$20.43	264,699	$20.33
$21.14-$21.14	521,102	7.27	$21.14	325,258	$21.14
$21.57-$24.90	186,884	4.15	$23.54	167,630	$23.48
$25.25-$25.25	359,587	5.62	$25.25	359,587	$25.25
$25.45-$26.75	407,063	4.18	$26.62	407,063	$26.62
$26.86-$28.88	413,507	2.22	$27.35	412,850	$27.35
$28.89-$39.49	485,066	7.46	$35.11	202,115	$33.90
$12.19-$39.49	3,557,183	4.65	$24.01	2,997,319	$23.13

Summary of perforamce-based awards outstanding [Table Text Block]

A summary of performance-based awards outstanding as of December 31, 2011, and activity during the three years 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, 2009	—		$	—
Granted	119		$	18.66
Vested	—		$	—
Forfeited or canceled	—		$	—
Outstanding at December 31, 2009	119		$	18.66
Granted	92		$	34.85
Vested	(121	)	$	18.81
Forfeited or canceled	(5	)	$	33.59
Outstanding at December 31, 2010	85		$	34.97
Granted	98		$	36.57
Vested	(85	)	$	34.97
Forfeited or canceled	(98	)	$	36.57
Outstanding at December 31, 2011	—		$	—	—	$	—
Vested and expected to vest at December 31, 2011	—				—	$	—

Summary of restricted stock units outstanding [Table Text Block]

A summary of RSUs outstanding as of December 31, 2011, and activity during three years 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, 2009	—		$	—
Granted	13		$	33.17
Vested	—		$	—
Forfeited or expired	—		$	—
Outstanding at December 31, 2009	13		$	33.17
Granted	259		$	36.44
Vested	(4	)	$	33.94
Forfeited or expired	(8	)	$	36.94
Outstanding at December 31, 2010	260		$	36.30
Granted	296		$	36.04
Vested	(64	)	$	36.26
Forfeited or expired	(34	)	$	37.13
Outstanding at December 31, 2011	458		$	36.08	1.60	$	15,175
Outstanding and expected to vest at December 31, 2011	411				1.59	$	13,627