STOCK PLANS AND SHARE BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2011

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, 2011 and June 30, 2010 (in thousands).

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Cost of revenues	$	216	$	173	$	455	$	329
Research and development	980		929		1,791		1,656
Sales and marketing	543		639		1,210		1,049
General and administrative	705		775		1,492		1,509
Total stock-based compensation expense	$	2,444	$	2,516	$	4,948	$	4,543

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:

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2011	2010	2011	2010
Risk-free interest rates	2.20%	2.25%	2.20%	2.25%
Expected volatility rates	44%	48%	44%	48%
Expected dividend yield	0.54%	0.54%	0.54%	0.54%
Expected term of stock options (in years)	6.00	5.12	6.00	5.12
Weighted-average grant date fair value of options granted	$15.71	$15.59	$15.71	$15.59

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:

	*Three Months Ended		Six Months Ended
	June 30,		June 30,
	2011	2010	2011	2010
Risk-free interest rates	—%	—%	0.17%	0.17% - 0.28%
Expected volatility rates	—%	—%	37%	36% - 40%
Expected dividend yield	—%	—%	0.51%	0.34% - 0.55%
Expected term of purchase right (years)	—	—	0.50	0.50
Weighted-average estimated fair value of purchase rights	$—	$—	$9.40	$7.96

 ________________    

*There were no employee stock purchase rights granted in the three months ended June 30, 2011 and 2010.

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, 2011, 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, 2011	4,433		$	22.68
Granted	96		36.95
Exercised	(616	)	19.83
Forfeited or expired	(58	)	25.18
Outstanding at June 30, 2011	3,855		$	23.46	4.91	$	57,726
Exercisable at June 30, 2011	3,152		$	22.73	4.16	$	49,480
Vested and expected to vest at June 30, 2011	3,815		$	23.38	4.87	$	57,434

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

A summary of performance-based awards outstanding as of June 30, 2011, 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, 2011	85		$	34.97
Granted	93		36.90
Vested	(85	)	34.97
Forfeited or expired	(6	)	36.61
Outstanding at June 30, 2011	87		$	36.93	0.5	$	3,340
Vested and expected to vest at June 30, 2011	42				0.5	$	1,607

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

A summary of RSUs outstanding as of June 30, 2011, 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, 2011	260		$	36.30
Granted	239		36.33
Vested	(54	)	36.61
Forfeited or expired	(13	)	36.89
Outstanding at June 30, 2011	432		$	36.26	2.12	$	16,583
Outstanding and expected to vest at June 30, 2011	374				2.10	$	14,374