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SHAREHOLDERS' EQUITY (Stock Options Under the Plans) (Details) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Number of options    
Options outstanding, beginning balance 856,986  
Granted  
Exercised (98,261)  
Expired & forfeited (2,500)  
Options outstanding, ending balance 756,225 856,986
Exercisable at December 31, 2015 653,100  
Weighted average exercise price    
Options outstanding, beginning balance $ 7.75 $ 5.38
Granted  
Exercised $ 7.63  
Expired & forfeited 10.04  
Options outstanding, ending balance 7.75 $ 7.75
Exercisable at December 31, 2015 $ 7.29  
Weighted average remaining contractual term (in years)    
Outstanding 3 years 2 months 5 days 3 years 3 months 11 days
Exercisable at December 31, 2015 2 years 11 months 23 days  
Aggregate intrinsic value    
Outstanding, beginning balance $ 6,157  
Outstanding, ending balance 4,539 $ 6,157
Options exercisable $ 4,198  
Vested and expected to vest at March 31, 2016    
Number of options 756,225  
Weighted average exercise price $ 7.75  
Weighted average remaining contractual life 3 years 2 months 5 days  
Aggregate intrinsic value $ 4,539