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SHAREHOLDERS' EQUITY (SCHEDULE OF SHARE-BASED COMPENSATION BY EXERCISE PRICE RANGE) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number outstanding (in shares) | shares 6,539
Number exercisable (in shares) | shares 3,247
Range of exercise prices: $6.77 - $7.51  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in USD per share) $ 6.77
Exercise price range, upper range limit (in USD per share) $ 7.51
Number outstanding (in shares) | shares 339
Remaining life (in years) 2 months 24 days
Average exercise price (in USD per share) $ 7.50
Number exercisable (in shares) | shares 339
Average exercise price (in USD per share) $ 7.50
Range of exercise prices: $10.88 - $16.22  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in USD per share) 10.88
Exercise price range, upper range limit (in USD per share) $ 16.22
Number outstanding (in shares) | shares 635
Remaining life (in years) 1 year 2 months 24 days
Average exercise price (in USD per share) $ 10.99
Number exercisable (in shares) | shares 634
Average exercise price (in USD per share) $ 10.98
Range of exercise prices: $16.42 - $21.57  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, lower range limit (in USD per share) 16.42
Exercise price range, upper range limit (in USD per share) $ 21.57
Number outstanding (in shares) | shares 5,565
Remaining life (in years) 6 years 8 months 24 days
Average exercise price (in USD per share) $ 19.17
Number exercisable (in shares) | shares 2,274
Average exercise price (in USD per share) $ 17.54