STOCK PLANS AND SHARE BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013, December 31, 2012, and December 31, 2011 (in thousands).

	Year Ended December 31,
	2013		2012		2011
Cost of revenues	$	1,074	$	1,058	$	666
Research and development	5,746		5,503		3,274
Sales and marketing	3,642		3,317		2,313
General and administrative	6,023		4,346		2,716
Total stock-based compensation expense	$	16,485	$	14,224	$	8,969

Schedule of Unrecognized Compensation Cost, Nonvested 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 December 31, 2013.

	December 31, 2013
	Unrecognized Compensation Expense for Unvested Awards		Weighted Average Remaining Recognition Period
	(In thousands)		(In years)
Options	$	2,000	1.53
Performance-based awards	—		0.00
Restricted stock units	19,100		2.47
Purchase plan	100		0.50
Total unrecognized compensation expense	$	21,200

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, 2013, 2012 and 2011:

	*2013	2012	2011
Risk-free interest rates	—%	1.01% - 0.87%	1.46% - 2.20%
Expected volatility rates	—%	45%	44%
Expected dividend yield	—%	0.51% - 0.57%	0.54% - 0.59%
Expected term of stock options (in years)	0	6.4	6.0
Weighted-average grant date fair value of options granted	$0.00	$18.20	$15.66

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, 2013, 2012 and 2011:

	2013	2012	2011
Risk-free interest rates	0.08% - 0.11%	0.09% - 0.14%	0.16% - 0.17%
Expected volatility rates	33% - 37%	34% - 48%	37%
Expected dividend yield	0.62% - 0.80%	0.54% - 0.57%	0.51% - 0.59%
Expected term of purchase right (years)	0.5	0.5	0.5
Weighted-average estimated fair value of purchase rights	$11.01	$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 December 31, 2013, 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, 2011	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
Granted	135		$	42.66
Exercised	(870	)	$	20.48
Forfeited or expired	(5	)	$	21.10
Outstanding at December 31, 2012	2,817		$	26.00
Granted	—		$	—
Exercised	(1,108	)	$	23.72
Forfeited or expired	(18	)	$	39.70
Outstanding at December 31, 2013	1,691		$	27.34	4.40	$	48,161
Exercisable at December 31, 2013	1,543		$	26.13	4.08	$	45,810
Vested and expected to vest at December 31, 2013	1,687		$	27.31	4.39	$	48,106

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

The following table summarizes the stock options outstanding at December 31, 2013:

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
$17.18 - $21.00	216,421	3.04	$18.80	216,421	$18.80
$21.14 - $23.35	320,745	5.04	$21.29	320,472	$21.29
$23.35 - $25.25	344,723	3.66	$25.04	344,723	$25.04
$25.25 - $26.86	314,185	2.28	$26.62	314,185	$26.62
$26.86 - $29.50	22,800	0.10	$27.38	22,800	$27.38
$29.50 - $30.78	8,700	7.13	$30.63	3,699	$30.43
$30.78 - $33.85	123,417	5.08	$32.16	117,917	$32.14
$33.85 - $36.95	84,750	7.13	$36.95	54,999	$36.95
$36.95 - $38.07	90,919	6.29	$38.06	82,168	$38.06
$38.07 - $42.88	164,460	8.03	$41.89	65,769	$41.85
$17.18 - $42.88	1,691,120	4.40	$27.34	1,543,153	$26.13

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

A summary of performance-based awards outstanding as of December 31, 2013, 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, 2011	85		$	34.97
Granted	98		$	36.57
Vested	(85	)	$	34.97
Forfeited or canceled	(98	)	$	36.57
Outstanding at December 31, 2011	—		$	—
Granted	102		$	37.60
Vested	—		$	—
Forfeited or canceled	—		$	—
Outstanding at December 31, 2012	102		$	37.60
Granted	102		$	38.68
Vested	(54	)	$	37.60
Change in units due to performance achievement for PSUs not earned	(48	)	$	37.60
Forfeited or canceled	(2	)	$	41.79
Outstanding at December 31, 2013	100		$	38.48	0	$	5,560
Outstanding and expected to vest at December 31, 2013	83				0	$	4,615

Summary of restricted stock units outstanding [Table Text Block]

A summary of RSUs outstanding as of December 31, 2013, and activity during the 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, 2010	260		$	36.30
Granted	296		$	36.04
Vested	(64	)	$	36.26
Forfeited	(34	)	$	37.13
Outstanding at December 31, 2010	458		$	36.08
Granted	293		$	41.06
Vested	(152	)	$	36.48
Forfeited	(26	)	$	36.92
Outstanding at December 31, 2012	573		$	38.21
Granted	386		$	39.09
Vested	(195	)	$	37.92
Forfeited	(50	)	$	39.50
Outstanding at December 31, 2013	714		$	38.97	1.39	$	39,873
Outstanding and expected to vest at December 31, 2013	668				1.37	$	37,311