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SHARE INCENTIVE PLANS - Acquisition Information (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 14, 2017
Feb. 23, 2016
Dec. 31, 2017
Mar. 14, 2016
Share-based compensation        
Total shares reserved for future issuance (in shares)     8,708,021 0
Business acquisition unvested employee RSU conversion ratio   56.00%    
Post-acquisition share-based compensation expense   $ 22.2    
Requisite service period   2 years 3 months 1 day    
EZchip        
Share-based compensation        
Post-acquisition share-based compensation expense   $ 22.2    
Requisite service period   2 years 3 months 1 day    
EZchip | Restricted Stock Units (RSUs)        
Share-based compensation        
Conversion of stock, shares converted (in shares)   891,822    
Consideration transferred, equity interests issued and issuable   $ 1.0    
EZchip | Acquisition-related EZchip        
Share-based compensation        
Equity interest issued or issuable (in shares)   499,894 499,894  
EZchip | Equity Issued in Business Combination | Acquisition-related EZchip        
Share-based compensation        
Equity interest issued or issuable, value assigned   $ 23.2 $ 23.2  
All other stock option plans        
Share-based compensation        
Total shares reserved for future issuance (in shares)       750,000
Second Restated Plan        
Share-based compensation        
Total shares reserved for future issuance (in shares) 2,390,000      
Shares reserved for future issuance, increase (decease) 1,640,000