INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 property	Mar. 31, 2011	Dec. 31, 2011 property
INVESTMENTS IN UNCONSOLIDATED ENTITIES
Management fees earned in connection with unconsolidated entities	$ 1,800,000	$ 800,000
Equity method investments
Number of properties accounted for under equity method	92		92
Net investments in unconsolidated entities	106,086,000		105,303,000
Income (loss) from unconsolidated entities	$ 317,000	$ (170,000)
Minimum
Equity method investments
Ownership interests in properties accounted for under the equity method (as a percent)	5.00%		5.00%
Maximum
Equity method investments
Ownership interests in properties accounted for under the equity method (as a percent)	25.00%		25.00%