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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES (Customer and Credit Risk Concentration) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
customers
Dec. 31, 2016
USD ($)
customers
Dec. 31, 2015
USD ($)
customers
Concentration Risk [Line Items]                      
NET REVENUES | $ $ 108,249 $ 111,255 $ 107,563 $ 104,688 $ 102,436 $ 101,625 $ 97,571 $ 88,036 $ 431,755 $ 389,668 $ 344,609
Distributors [Member]                      
Concentration Risk [Line Items]                      
NET REVENUES | $                 $ 330,900 $ 292,600 $ 261,400
Credit Concentration Risk | Accounts Receivable                      
Concentration Risk [Line Items]                      
Concentration risk percentage benchmark for total accounts receivable 10.00%       10.00%       10.00% 10.00%  
Number of major customers | customers                 10 10  
Concentration Risk, Percentage                 64.00% 70.00%  
Credit Concentration Risk | Accounts Receivable | Avnet                      
Concentration Risk [Line Items]                      
Concentration Risk, Percentage                 18.00% 24.00%  
Customer Concentration Risk | Net Revenues                      
Concentration Risk [Line Items]                      
Number of major customers | customers                 10 10 10
Concentration Risk, Percentage                 10.00% 10.00% 10.00%
Concentration risk percentage of net revenue                 54.00% 60.00% 61.00%
Customer Concentration Risk | Net Revenues | Avnet                      
Concentration Risk [Line Items]                      
Concentration risk percentage of net revenue                 16.00% 18.00% 21.00%
Customer Concentration Risk | Net Revenues | Powertech Distribution Ltd.                      
Concentration Risk [Line Items]                      
Concentration risk percentage of net revenue                   10.00% 11.00%