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STOCK BASED COMPENSATION (Summary of Options Outstanding) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding 8,780,400
Weighted Average Remaining Contractual Life 3 years 1 month 6 days
Number of Exercisable Options 7,240,729
$0.20 - $0.99 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Limit 0.20
Exercise Price, Upper Limit 0.99
Number of Options Outstanding 1,283,336
Weighted Average Remaining Contractual Life 2 years 8 months 12 days
Number of Exercisable Options 1,283,336
$1.00 - $3.99 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Limit 1.00
Exercise Price, Upper Limit 3.99
Number of Options Outstanding 2,659,681
Weighted Average Remaining Contractual Life 2 years 9 months 18 days
Number of Exercisable Options 2,567,201
$4.00 - $5.99 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Limit 4.00
Exercise Price, Upper Limit 5.99
Number of Options Outstanding 601,635
Weighted Average Remaining Contractual Life 3 years 9 months 18 days
Number of Exercisable Options 591,509
$6.00 - $8.99 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Limit 6.00
Exercise Price, Upper Limit 8.99
Number of Options Outstanding 3,760,710
Weighted Average Remaining Contractual Life 4 years
Number of Exercisable Options 2,583,188
$9.00 - $14.50 [Member]
 
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Limit 9.00
Exercise Price, Upper Limit 14.50
Number of Options Outstanding 475,038
Weighted Average Remaining Contractual Life 5 years 2 months 12 days
Number of Exercisable Options 215,495