LOANS RECEIVABLE AND OTHER INVESTMENTS - Schedule of Loans Receivable and Other Investments (Details) $ in Thousands	Sep. 30, 2015 USD ($) loan	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	15
Loans Receivable, Principal Balance	$ 259,175
Loans Receivable, Book Value	$ 259,826	$ 235,176
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	8.40%
Loans Receivable, Weighted Average Annualized Effective Interest Rate / Rate of Return	8.50%
Preferred Equity Investment, Quantity | loan	10
Preferred Equity Investment, Principal Balance	$ 27,284	16,125
Preferred Equity Investment, Book Value	$ 27,622	16,407
Preferred Equity Investment, Weighted Average Contractual Interest Rate / Rate of Return	13.00%
Preferred Equity Investment, Weighted Average Annualized Effective Interest Rate / Rate of Return	13.00%
Total Investments, Quantity | loan	25
Total Investments, Principal Balance	$ 286,459
Total Investments, Book Value	$ 287,448	251,583
Total Investments, Weighted Average Contractual Interest Rate / Rate of Return	8.80%
Total Investments, Weighted Average Annualized Effective Interest Rate / Rate of Return	8.90%
Mortgage Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	7
Loans Receivable, Principal Balance	$ 162,794
Loans Receivable, Book Value	$ 163,089	144,383
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	8.40%
Loans Receivable, Weighted Average Annualized Effective Interest Rate / Rate of Return	8.60%
Construction Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	3
Loans Receivable, Principal Balance	$ 74,189
Loans Receivable, Book Value	$ 74,409	65,525
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	7.70%
Loans Receivable, Weighted Average Annualized Effective Interest Rate / Rate of Return	7.60%
Mezzanine Investments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	2
Loans Receivable, Principal Balance	$ 18,586
Loans Receivable, Book Value	$ 18,629	21,491
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	11.30%
Loans Receivable, Weighted Average Annualized Effective Interest Rate / Rate of Return	11.10%
Pre-Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	3
Loans Receivable, Principal Balance	$ 3,606
Loans Receivable, Book Value	$ 3,699	$ 3,777
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	9.00%
Loans Receivable, Weighted Average Annualized Effective Interest Rate / Rate of Return	7.70%