STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options Activity [Rollforward]
Outstanding at January 1, 2012 (in shares)	3,764,870
Granted (in shares)	480,250	575,000	803,750
Exercised (in shares)	(100,000)	(500,000)	(200,000)
Canceled (in shares)	(103,549)
Outstanding, December 31, 2012 (in shares)	4,060,790	3,764,870
Option Price, outstanding, beginning of period, minimum		$ 14.28
Option price, outstanding, beginning of period, maximum (in dollars per share)	$ 23.78
Option price, granted (in dollars per share)	$ 21.92
Option price, exercised, minimum (in dollars per share)	$ 14.28
Option price exercised, maximum (in dollars per share)	$ 18.78
Option price, canceled, minimum (in dollars per share)	$ 14.28
Option price, canceled, maximum (in dollars per share)	$ 18.78
Option price, outstanding, minimum, end of period (in dollars per share)	$ 14.28
Option price, outstanding, maximum, end of period (in dollars per share)	$ 23.78
Weighted average option price, beginning of period (in dollars per share)	$ 17.84
Weighted average option price, granted (in dollars per share)	$ 21.92	$ 18.78	$ 15.68
Weighted average option price, exercised (in dollars per share)	$ 16.23
Weighted average option price, canceled (in dollars per share)	$ 16.39
Weighted average option price, outstanding, end of period (in dollars per share)	$ 18.39	$ 17.84
Options exercisable, beginning of period (in shares)	2,415,347
Options exercisable, end of period (in shares)	2,961,434	2,415,347
Weighted average exercise price, exercisable , beginning of period (in dollars per share)	$ 18.46
Weighted average exercise price, exercisable, end of period (in dollars per share)	$ 18.00	$ 18.46