INVESTMENT DEBT (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2014 Investment acquisition Loan	Dec. 31, 2013
Debt Instrument [Line Items]
Number of mortgage loans consolidated	20
Number of acquisitions partially financed with mortgages	14
Number of investments partially financed with mortgages	3
Mortgage Loans Payable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate of investment debt	3.03%	4.02%
Percent of property level debt with fixed rate	43.00%	86.00%
Percent of property level debt with floating rate and interest caps	38.00%	7.00%
Percent of property level debt with floating rate, without interest caps	19.00%	7.00%