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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, 2017
Dec. 31, 2016
Outstanding    
Number outstanding 1,570  
Weighted average remaining contractual life (years) 3 years 1 month 13 days 3 years 4 months 6 days
Weighted average exercise price $ 9.64  
Exercisable    
Number exercisable 1,244  
Weighted average remaining contractual life (years) 2 years 7 months 28 days  
Weighted average exercise price $ 9.93  
$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 395  
Weighted average remaining contractual life (years) 4 years 1 month 16 days  
Weighted average exercise price $ 6.11  
Exercisable    
Number exercisable 189  
Weighted average remaining contractual life (years) 2 years 7 months 6 days  
Weighted average exercise price $ 5.61  
$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 357  
Weighted average remaining contractual life (years) 2 years 4 months 9 days  
Weighted average exercise price $ 9.16  
Exercisable    
Number exercisable 357  
Weighted average remaining contractual life (years) 2 years 4 months 9 days  
Weighted average exercise price $ 9.16  
$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 546  
Weighted average remaining contractual life (years) 2 years 7 months 6 days  
Weighted average exercise price $ 10.86  
Exercisable    
Number exercisable 504  
Weighted average remaining contractual life (years) 2 years 6 months 3 days  
Weighted average exercise price $ 10.90  
$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 272  
Weighted average remaining contractual life (years) 3 years 8 months 12 days  
Weighted average exercise price $ 12.97  
Exercisable    
Number exercisable 194  
Weighted average remaining contractual life (years) 3 years 7 months 28 days  
Weighted average exercise price $ 13.02