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SHARE INCENTIVE PLANS: (Plans, Acquisition Information) (Details)
$ in Millions
Feb. 23, 2016
USD ($)
shares
Jun. 30, 2016
plan
shares
Dec. 31, 2015
shares
Share incentive plans      
Number of plans | plan   10  
Common stock, capital shares reserved for future issuance   10,459,118  
Business acquisition unvested employee RSU conversion ratio 0.56%    
Acquisition-related EZchip [Member]      
Share incentive plans      
Restricted share units outstanding 1    
Restricted Stock Units (RSUs) [Member]      
Share incentive plans      
Conversion of stock, shares converted 499,894    
Restricted share units outstanding   3,779,296 2,205,083
EZchip [Member]      
Share incentive plans      
Aggregate intrinsic value, nonvested shares | $ $ 23.2    
EZchip [Member] | Acquisition-related EZchip [Member]      
Share incentive plans      
Number of shares 499,894    
Aggregate intrinsic value, nonvested shares | $ $ 23.2    
EZchip [Member] | Restricted Stock Units (RSUs) [Member]      
Share incentive plans      
Conversion of stock, shares converted 891,822    
EZchip [Member] | Equity Issued in Business Combination [Member] | Acquisition-related EZchip [Member]      
Share incentive plans      
Business acquisition, equity interest issued or issuable, value assigned | $ $ 1.0    
EZchip [Member] | Stock Compensation Plan [Member] | Acquisition-related EZchip [Member]      
Share incentive plans      
Business acquisition, equity interest issued or issuable, value assigned | $ $ 22.2    
Award requisite service period (in years) 2 years 2 months 29 days