LINES OF CREDIT - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 1,000,000,000
Line of credit, expiration date	Jun. 02, 2015
Line of credit, amount outstanding	0
Compensating balance requirments for our letters of credit	50,000,000
Real Estate
Line of Credit Facility [Line Items]
Line of credit, amount available	$ 50,000,000