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ACCOUNTING POLICIES (Details 2) (USD $)	3 Months Ended
ACCOUNTING POLICIES (Details 2) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Revenue Recognition [Abstract]
Straight-line rent receivables	$ 195,177,000us-gaap_DeferredRentReceivablesNet	$ 187,969,000us-gaap_DeferredRentReceivablesNet
Allowance for Straight-Line Rent Receivable	$ (155,900,000)	$ (145,100,000)
Term of resident lease agreements, minimum	12 months
Term of resident lease agreements, maximum	18 months
Notice period to cancel lease agreements by the resident	30 days

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

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