STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock Options Activity [Rollforward]
Outstanding at beginning of year (in shares)	5,734,740
Granted (in shares)	1,621,000	1,670,400	776,750
Exercised (in shares)	(1,791,865)
Canceled (in shares)	(221,349)
Outstanding at end of year (in shares)	5,342,526	5,734,740
Option Price, outstanding, beginning of period, minimum (in dollars per share)		$ 13.14
Option price, outstanding, beginning of period, maximum (in dollars per share)	$ 27.65
Option price, granted, minimum (in dollars per share)	29.75
Option price, granted, maximum (in dollars per share)	31.90
Option price, exercised, minimum (in dollars per share)	13.14
Option price exercised, maximum (in dollars per share)	27.40
Option price, canceled, minimum (in dollars per share)	13.14
Option price, canceled, maximum (in dollars per share)	29.75
Option price, outstanding, minimum, end of period (in dollars per share)	13.14
Option price, outstanding, maximum, end of period (in dollars per share)	31.90
Weighted average option price, beginning of period (in dollars per share)	19.25
Weighted average option price, granted (in dollars per share)	29.82	13.14	$ 27.40
Weighted average option price, exercised (in dollars per share)	18.09
Weighted average option price, canceled (in dollars per share)	22.14
Weighted average option price, outstanding, end of period (in dollars per share)	$ 22.72	$ 19.25
Options exercisable, beginning of period (in shares)	3,407,300
Options exercisable, end of period (in shares)	2,603,962	3,407,300
Weighted average exercise price, exercisable , beginning of period (in dollars per share)	$ 20.56
Weighted average exercise price, exercisable, end of period (in dollars per share)	$ 21.78	$ 20.56