STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options Activity [Rollforward]
Outstanding at beginning of year (in shares)	4,114,822
Granted (in shares)	624,200	621,000	480,250
Exercised (in shares)	(572,607)
Canceled (in shares)	(32,662)
Outstanding at end of year (in shares)	4,133,753	4,114,822
Option Price, outstanding, beginning of period, minimum (in dollars per share)		$ 14.28
Option price, outstanding, beginning of period, maximum (in dollars per share)	$ 23.78
Option price, granted, minimum (in dollars per share)	$ 25.27
Option price, granted, maximum (in dollars per share)	$ 27.64
Option price, exercised, minimum (in dollars per share)	$ 14.28
Option price exercised, maximum (in dollars per share)	$ 23.78
Option price, canceled, minimum (in dollars per share)	$ 18.52
Option price, canceled, maximum (in dollars per share)	$ 25.57
Option price, outstanding, minimum, end of period (in dollars per share)	$ 14.28
Option price, outstanding, maximum, end of period (in dollars per share)	$ 27.64
Weighted average option price, beginning of period (in dollars per share)	$ 19.33
Weighted average option price, granted (in dollars per share)	$ 25.69	$ 23.28	$ 21.92
Weighted average option price, exercised (in dollars per share)	$ 20.13
Weighted average option price, canceled (in dollars per share)	$ 23.81
Weighted average option price, outstanding, end of period (in dollars per share)	$ 20.14	$ 19.33
Options exercisable, beginning of period (in shares)	3,011,702
Options exercisable, end of period (in shares)	2,976,870	3,011,702
Weighted average exercise price, exercisable , beginning of period (in dollars per share)	$ 18.29
Weighted average exercise price, exercisable, end of period (in dollars per share)	$ 18.50	$ 18.29