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ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Revenue Recognition
Straight-line rent receivables	$ 112,510	$ 96,883
Notice period to cancel lease agreements by the resident	30 days
Minimum
Revenue Recognition
Term of resident lease agreements	12 months
Maximum
Revenue Recognition
Term of resident lease agreements	18 months

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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