EMPLOYEE STOCK PLANS - Summary of options issued (Details)	12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Stock Options	May 31, 2012 Stock Options	Dec. 16, 2008 Stock Options	Dec. 31, 2011 Compensation and Stock Option Plan 2008-2010	Dec. 31, 2010 Compensation and Stock Option Plan 2008-2010	Dec. 31, 2009 Compensation and Stock Option Plan 2008-2010	Dec. 31, 2012 Compensation and Stock Option Plan 2008-2010	Dec. 16, 2008 Compensation and Stock Option Plan 2008-2010	Dec. 31, 2011 Compensation and Stock Option Plan 2008-2010 Stock Options Key Managers	Dec. 31, 2010 Compensation and Stock Option Plan 2008-2010 Stock Options Key Managers	Dec. 31, 2009 Compensation and Stock Option Plan 2008-2010 Stock Options Key Managers	Dec. 31, 2012 Compensation and Stock Option Plan 2008-2010 Stock Options Key Managers	Dec. 16, 2008 Compensation and Stock Option Plan 2008-2010 Stock Options Key Managers	Dec. 31, 2011 Compensation and Stock Option Plan 2008-2010 Stock Options Director	Dec. 31, 2010 Compensation and Stock Option Plan 2008-2010 Stock Options Director	Dec. 31, 2009 Compensation and Stock Option Plan 2008-2010 Stock Options Director	Dec. 31, 2012 Compensation and Stock Option Plan 2008-2010 Stock Options Director	Dec. 16, 2008 Compensation and Stock Option Plan 2008-2010 Stock Options Director	Dec. 31, 2011 Compensation and Stock Option Plan 2008-2010 Other Awards and Reserves	Dec. 31, 2010 Compensation and Stock Option Plan 2008-2010 Other Awards and Reserves	Dec. 31, 2009 Compensation and Stock Option Plan 2008-2010 Other Awards and Reserves	Dec. 31, 2012 Compensation and Stock Option Plan 2008-2010 Other Awards and Reserves	Dec. 16, 2008 Compensation and Stock Option Plan 2008-2010 Other Awards and Reserves
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares approved			50,350,000	536,924	10,000,000					2,674,420					1,300,000					400,000					974,420
Number of shares issued	(335,000)	(577,851)				(1,761,569)	(335,000)	(577,851)			(1,076,000)		(224,000)			(80,000)	(160,000)	(160,000)			(605,569)	(175,000)	(193,851)
Remaining number of shares			40,100,000