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SHAREHOLDERS' EQUITY (Stock Options Under the Plans) (Details) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Number of options    
Options outstanding, beginning balance 624,437  
Granted [1] 65,002  
Exercised (71,937)  
Expired and forfeited (8,700)  
Options outstanding, ending balance 608,802 624,437
Exercisable at June 30, 2017 273,400  
Weighted-average exercise price    
Options outstanding, beginning balance $ 10.47  
Granted [1] 18.90  
Exercised 8.96  
Expired and forfeited 11.29  
Options outstanding, ending balance 11.54 $ 10.47
Exercisable at June 30, 2017 $ 9.71  
Weighted-average remaining contractual term (in years)    
Outstanding 3 years 5 months 1 day 3 years 6 months 18 days
Exercisable at June 30, 2016 2 years 7 months 17 days  
Aggregate intrinsic value    
Outstanding, beginning balance $ 4,576  
Outstanding, ending balance 4,756 $ 4,576
Options exercisable $ 2,637  
Vested and expected to vest at June 30, 2016    
Number of options 608,802  
Weighted average exercise price $ 11.54  
Weighted-average remaining contractual term (in years) 3 years 5 months 1 day  
Aggregate intrinsic value $ 4,756  
[1] The fair value of the options granted during the six months period ended June 30, 2017 was estimated by using a Black-Scholes option-pricing model which requires the following assumptions: risk-free interest rates of 1.6% - 1. 9% which is based on the yield from U.S. treasury zero-coupon bonds with an equivalent term to the options' expected term, expected volatility of 49.3% - 55.9% which is calculated based upon actual historical stock price movements over the most recent periods ending on the grant date and an expected term of 3.45 - 4.76 years which is generated by running a Monte Carlo model pursuant to which historical post-vesting forfeitures and suboptimal exercise factor are estimated by using historical option exercise information of the options.