COMMON STOCK REPURCHASES (Details) (USD $)	1 Months Ended	9 Months Ended
	Jan. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		889,795
Employees' Taxes Withheld And Paid For Restricted Stock And Restricted Stock Units		$ 2,848,000	$ 2,457,000
Treasury Stock, Shares, Retired	5,398,376		5,000,000
Treasury Stock, Retired, Cost Method, Amount	176,300,000		177,100,000
Open Market Repurchases [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired		743,818	2,907,936
Treasury Stock, Value, Acquired, Cost Method		23,600,000	94,100,000
Treasury Stock Acquired, Average Cost Per Share		$ 31.76	$ 32.37
Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired			3,967,883
Treasury Stock, Value, Acquired, Cost Method			150,000,000
Accelerated Share Repurchase, Value Allocated to Treasury Stock			135,000,000
Accelerated Share Repurchase, Value Allocated To Equity Forward Contract			$ 15,000,000