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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, 2016
Dec. 31, 2015
Outstanding    
Number outstanding 1,903  
Weighted average remaining contractual life (years) 3 years 4 months 6 days 3 years 11 months 23 days
Weighted average exercise price $ 8.90  
Exercisable    
Number exercisable 1,324  
Weighted average remaining contractual life (years) 2 years 8 months 19 days  
Weighted average exercise price $ 8.43  
$1.48 - $5.68 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price, minimum 1.48  
Exercise price, maximum $ 5.68  
Outstanding    
Number outstanding 478  
Weighted average remaining contractual life (years) 2 years 3 months  
Weighted average exercise price $ 3.62  
Exercisable    
Number exercisable 346  
Weighted average remaining contractual life (years) 9 months 26 days  
Weighted average exercise price $ 2.84  
$5.72-$10.03 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Exercise price, minimum 5.72  
Exercise price, maximum $ 10.03  
Outstanding    
Number outstanding 482  
Weighted average remaining contractual life (years) 3 years 3 months 22 days  
Weighted average exercise price $ 8.72  
Exercisable    
Number exercisable 394  
Weighted average remaining contractual life (years) 3 years 2 months 1 day  
Weighted average exercise price $ 8.75  
$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 576  
Weighted average remaining contractual life (years) 3 years 6 months 22 days  
Weighted average exercise price $ 10.86  
Exercisable    
Number exercisable 430  
Weighted average remaining contractual life (years) 3 years 3 months 29 days  
Weighted average exercise price $ 10.97  
$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 367  
Weighted average remaining contractual life (years) 4 years 5 months 23 days  
Weighted average exercise price $ 12.92  
Exercisable    
Number exercisable 154  
Weighted average remaining contractual life (years) 4 years 1 month 17 days  
Weighted average exercise price $ 12.98