STOCK PLANS AND SHARE-BASED COMPENSATION (Stock-Based Compensation) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 3,642,000	$ 2,444,000	$ 6,673,000	$ 4,948,000
Stock Options [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	5,406,000		5,406,000
Weighted Average Remaining Recognition Period (in years)			2.09
Stock compensation expense	900,000	900,000	1,900,000	2,100,000
Performance-based Awards [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	1,705,000		1,705,000
Weighted Average Remaining Recognition Period (in years)			0.50
Stock compensation expense	700,000	300,000	1,100,000	700,000
Restricted Stock Units (RSUs) [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	18,964,000		18,964,000
Weighted Average Remaining Recognition Period (in years)			2.95
Stock compensation expense	1,700,000	900,000	3,100,000	1,400,000
Employees Stock Purchase Plan [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized Compensation Expense for Unvested Awards	100,000		100,000
Weighted Average Remaining Recognition Period (in years)			0.50
Stock compensation expense	300,000	200,000	600,000	600,000
Compensation Expense Amortized from Beginning Inventory [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock compensation expense		100,000		100,000
Cost of revenues [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	256,000	216,000	501,000	455,000
Research and Development [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	1,566,000	980,000	2,687,000	1,791,000
Sales and Marketing [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	746,000	543,000	1,493,000	1,210,000
General and Administrative [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 1,074,000	$ 705,000	$ 1,992,000	$ 1,492,000