FINANCIAL INSTRUMENTS (Details2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2010 Interest rate swaps	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	$ 375.0	$ 300.0	$ 75.0
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