Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Exercise price range) (Details)

v3.8.0.1
STOCK-BASED COMPENSATION (Exercise price range) (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
$2.75-$4.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) $ 2.75
Upper range limit (in dollars per share) $ 4.99
Outstanding (in shares) | shares 1,713
Outstanding, weighted average remaining contractual life (in years) 1 year 2 months
Outstanding, weighted average exercise price (in dollars per share) $ 2.82
Exercisable (in shares) | shares 1,713
Exercisable, weighted average remaining contractual life (in years) 1 year 2 months
Exercisable, weighted average exercise price (in dollars per share) $ 2.82
$5.00-$9.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) 5.00
Upper range limit (in dollars per share) $ 9.99
Outstanding (in shares) | shares 4,455
Outstanding, weighted average remaining contractual life (in years) 4 years 9 months
Outstanding, weighted average exercise price (in dollars per share) $ 8.81
Exercisable (in shares) | shares 4,455
Exercisable, weighted average remaining contractual life (in years) 4 years 9 months
Exercisable, weighted average exercise price (in dollars per share) $ 8.81
$10.00-$14.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) 10.00
Upper range limit (in dollars per share) $ 14.99
Outstanding (in shares) | shares 2,540
Outstanding, weighted average remaining contractual life (in years) 3 years 4 months
Outstanding, weighted average exercise price (in dollars per share) $ 11.34
Exercisable (in shares) | shares 2,540
Exercisable, weighted average remaining contractual life (in years) 3 years 4 months
Exercisable, weighted average exercise price (in dollars per share) $ 11.34
$15.00-$19.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) 15.00
Upper range limit (in dollars per share) $ 19.99
Outstanding (in shares) | shares 1,269
Outstanding, weighted average remaining contractual life (in years) 7 years
Outstanding, weighted average exercise price (in dollars per share) $ 19.04
Exercisable (in shares) | shares 745
Exercisable, weighted average remaining contractual life (in years) 6 years 2 months
Exercisable, weighted average exercise price (in dollars per share) $ 18.82
$20.00-$24.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) 20.00
Upper range limit (in dollars per share) $ 24.99
Outstanding (in shares) | shares 1,842
Outstanding, weighted average remaining contractual life (in years) 6 years 2 months
Outstanding, weighted average exercise price (in dollars per share) $ 21.15
Exercisable (in shares) | shares 1,467
Exercisable, weighted average remaining contractual life (in years) 6 years 1 month
Exercisable, weighted average exercise price (in dollars per share) $ 21.15
$25.00-$29.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) 25.00
Upper range limit (in dollars per share) $ 29.99
Outstanding (in shares) | shares 2,061
Outstanding, weighted average remaining contractual life (in years) 7 years 11 months
Outstanding, weighted average exercise price (in dollars per share) $ 26.77
Exercisable (in shares) | shares 986
Exercisable, weighted average remaining contractual life (in years) 7 years 1 month
Exercisable, weighted average exercise price (in dollars per share) $ 25.35
$30.00 - $44.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding (in shares) | shares 359
Outstanding, weighted average remaining contractual life (in years) 9 years 11 months
Outstanding, weighted average exercise price (in dollars per share) $ 43.50
Exercisable (in shares) | shares 0
Exercisable, weighted average remaining contractual life (in years) 0 years
Exercisable, weighted average exercise price (in dollars per share) $ 0.00