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SHARE INCENTIVE PLANS: (Plans, Acquisition Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 23, 2016
Mar. 31, 2017
Dec. 31, 2016
Share incentive plans      
Business acquisition unvested employee RSU conversion ratio 0.56%    
Share-based compensation expense $ 22,200    
Award requisite service period (in years) 2 years 3 months 1 day    
Weighted average period for recognition of unrecognized share-based compensation costs (in years)   2 years 8 months 5 days  
Acquisition-related EZchip [Member]      
Share incentive plans      
Restricted share units outstanding 1    
Restricted Stock Units (RSUs) [Member]      
Share incentive plans      
Restricted share units outstanding   3,092,935 3,324,519
EZchip [Member]      
Share incentive plans      
Fair value of awards attributable to pre-acquisition services $ 972    
EZchip [Member] | Acquisition-related EZchip [Member]      
Share incentive plans      
Equity interest issued or issuable, number of shares 499,894    
EZchip [Member] | Restricted Stock Units (RSUs) [Member]      
Share incentive plans      
Conversion of stock, shares converted 891,822    
Fair value of awards attributable to pre-acquisition services, component of purchase price $ 1,000    
EZchip [Member] | Equity Issued in Business Combination [Member] | Acquisition-related EZchip [Member]      
Share incentive plans      
Equity interest issued or issuable, value assigned $ 23,200