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STOCKHOLDERS' EQUITY (Stock Options, Restricted Stock Units and Employee Stock Purchase Plan) (Narrative) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Value Assumed as Part of Acuisition 400,000      
Share counted against the numerical limit for options available for grant on or after May 9, 2013 1.57      
Share available for grant after ratio adjustment 4,900,000      
Common stock, par value (in dollars per share) $ 0.001 $ 0.001    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 57.00%      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares approved for issuance (in shares)     25,000,000  
Stock units issued (in shares) 5,216,000 6,675,000 7,922,000  
Weighted-average fair value of the rights to purchase shares (in dollars per share) $ 8.46 $ 8.40 $ 8.84 $ 8.71
Performance-based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units issued (in shares)     1,048,000  
Stock Plan 2005 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares counted against the numerical limit for options available for grant on or after May 18, 2011 (in shares) 1.61      
Shares counted against the numerical limit for options available for grant prior to May 18, 2011 (in shares) 1.78      
Total shares authorized [Member] [Domain]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total shares authorized 158,000,000      
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuances 7,734,000 13,611,000 21,245,000 6,148,000
Ozmo Inc. [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units issued (in shares) 300,000      
Weighted-average fair value of the rights to purchase shares (in dollars per share) $ 6.17      
Ozmo Inc. [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units issued (in shares) 100,000      
Weighted-average fair value of the rights to purchase shares (in dollars per share) $ 0.81      
NMI [Member] [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units issued (in shares) 100,000      
Weighted-average fair value of the rights to purchase shares (in dollars per share) $ 8.20      
2016 Long-term Performance-based Incentive Plan [Member] | Performance-based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units issued (in shares) 600,000