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SHAREHOLDERS' EQUITY (Schedule of Shares Authorized Under Stock Option Plans by Exercise Price Range) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Outstanding    
Number outstanding 967  
Weighted average remaining contractual life (years) 2 years 6 months 7 days 3 years 1 month 13 days
Weighted average exercise price $ 9.38  
Exercisable    
Number exercisable 834  
Weighted average remaining contractual life (years) 2 years 2 months 1 day  
Weighted average exercise price $ 9.70  
$2.76 - $7.29 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price, minimum 2.76  
Exercise price, maximum $ 7.29  
Outstanding    
Number outstanding 289  
Weighted average remaining contractual life (years) 4 years 1 month 9 days  
Weighted average exercise price $ 6.50  
Exercisable    
Number exercisable 165  
Weighted average remaining contractual life (years) 3 years 8 months 19 days  
Weighted average exercise price $ 6.36  
$7.81-$10.03 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price, minimum 7.81  
Exercise price, maximum $ 10.03  
Outstanding    
Number outstanding 292  
Weighted average remaining contractual life (years) 1 year 5 months 12 days  
Weighted average exercise price $ 9.17  
Exercisable    
Number exercisable 292  
Weighted average remaining contractual life (years) 1 year 5 months 12 days  
Weighted average exercise price $ 9.17  
$10.06 - $11.32 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price, minimum 10.06  
Exercise price, maximum $ 11.32  
Outstanding    
Number outstanding 238  
Weighted average remaining contractual life (years) 1 year 8 months 9 days  
Weighted average exercise price $ 10.66  
Exercisable    
Number exercisable 235  
Weighted average remaining contractual life (years) 1 year 8 months 2 days  
Weighted average exercise price $ 10.67  
$11.38 - $14.68 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price, minimum 11.38  
Exercise price, maximum $ 14.68  
Outstanding    
Number outstanding 142  
Weighted average remaining contractual life (years) 2 years 8 months 16 days  
Weighted average exercise price $ 13.05  
Exercisable    
Number exercisable 142  
Weighted average remaining contractual life (years) 2 years 8 months 16 days  
Weighted average exercise price $ 13.05  
$21.13 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price $ 21.13  
Outstanding    
Number outstanding 6  
Weighted average remaining contractual life (years) 5 years 11 months 19 days  
Weighted average exercise price $ 21.13  
Exercisable    
Number exercisable  
Weighted average exercise price