STOCK PLANS AND SHARE BASED COMPENSATION (Stock-Based Compensation) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 2,444,000	$ 2,516,000	$ 4,948,000	$ 4,543,000
Stock compensation expense	2,400,000	2,500,000	4,900,000	4,500,000
Compensation expense amortized from beginning inventory	100,000	(23,000)	100,000	(17,000)
Stock Options [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized compensation costs	6,800,000		6,800,000
Unrecognized compensation costs, period of recognition (in years)			2.13
Stock compensation expense	900,000	1,200,000	2,100,000	2,600,000
Performance-based Awards [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized compensation costs	900,000		900,000
Stock compensation expense	300,000	800,000	700,000	1,100,000
Restricted Stock Units (RSUs) [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized compensation costs	12,400,000		12,400,000
Unrecognized compensation costs, period of recognition (in years)			3.41
Stock compensation expense	900,000	300,000	1,400,000	300,000
Employees Stock Purchase Plan [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Unrecognized compensation costs	100,000		100,000
Unrecognized compensation costs, period of recognition (in years)			0.5
Stock compensation expense	200,000	200,000	600,000	500,000
Cost of revenues [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	216,000	173,000	455,000	329,000
Research and Development Expense [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	980,000	929,000	1,791,000	1,656,000
Selling and Marketing Expense [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	543,000	639,000	1,210,000	1,049,000
General and Administrative Expense [Member]
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 705,000	$ 775,000	$ 1,492,000	$ 1,509,000