SUBSEQUENT EVENTS (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended								12 Months Ended				1 Months Ended
	Nov. 29, 2011	Feb. 27, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Fund III [Member]	Feb. 27, 2013 Norstrand Avenue [Member] Fund III [Member] Subsequent Event [Member]	Jan. 31, 2013 Unsecured Debt [Member] Revolving Credit Facility [Member] Subsequent Event [Member]	Jan. 31, 2013 Secured Debt [Member] Revolving Credit Facility [Member] Subsequent Event [Member]	Feb. 27, 2013 Mortgages [Member] Norstrand Avenue [Member] Fund III [Member] Subsequent Event [Member] extensions	Feb. 27, 2013 Mortgages [Member] Norstrand Avenue [Member] Fund III [Member] Subsequent Event [Member] LIBOR [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount																$ 150,000,000	$ 64,500,000	$ 16,000,000
Proceeds from Reimbursement of Impaired Asset Costs and Accrued Interest														3,000,000
Business Acquisition, Cost of Acquired Entity, Purchase Price														107,986,000	19,000,000
Proceeds from notes receivable											$ 25,388,000	$ 56,519,000	$ 42,010,000		$ 18,500,000
Debt Instrument, Basis Spread on Variable Rate																			2.65%
Number of Loan Extensions																		2
Cash dividends declared per Common Share	$ 0.18	$ 0.21	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.72	$ 0.72	$ 0.72