FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 12, 2011 Interest rate swap through December 12, 2011	Feb. 28, 2011 Interest rate swap Through February 28, 2011
Interest Rate Derivatives
Amount of variable-rate debt hedged	$ 300	$ 75
Fixed interest rate paid (as a percent)	4.89%	3.86%

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

No definition available.

Name:	us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant