STOCK-BASED COMPENSATION (Details 3)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable (in shares) | shares	2,603,962
Options outstanding (in shares) | shares	5,342,526
Under $20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 0.00
Range of exercise price, maximum, (in dollars per share)	$ 20.00
Options exercisable (in shares) | shares	788,749
Weighted average exercise price, exercisable (in dollars per share)	$ 15.05
Options outstanding (in shares) | shares	1,782,327
Weighted average exercise price, outstanding (in dollars per share)	$ 13.98
$20.00 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	20.00
Range of exercise price, maximum, (in dollars per share)	$ 25.00
Options exercisable (in shares) | shares	855,668
Weighted average exercise price, exercisable (in dollars per share)	$ 22.69
Options outstanding (in shares) | shares	855,668
Weighted average exercise price, outstanding (in dollars per share)	$ 22.69
Over $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 25.00
Options exercisable (in shares) | shares	959,545
Weighted average exercise price, exercisable (in dollars per share)	$ 26.50
Options outstanding (in shares) | shares	2,704,531
Weighted average exercise price, outstanding (in dollars per share)	$ 28.49