LOANS RECEIVABLE AND OTHER INVESTMENTS - Schedule of Loans Receivable and Other Investments (Details) $ in Thousands	Sep. 30, 2017 USD ($) loan	Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	24
Loans Receivable, Principal Balance	$ 129,341
Loans Receivable, Book Value	$ 103,689	$ 53,596
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	9.30%
Loan loss reserve	$ (6,211)	(2,750)
Loans Receivable, Net Amount	$ 97,478	50,846
Preferred Equity Investment, Quantity | loan	13
Preferred Equity Investment, Principal Balance	$ 51,833	44,882
Preferred Equity Investment, Book Value	$ 52,288	45,190
Preferred Equity Investment, Weighted Average Contractual Interest Rate / Rate of Return	12.80%
Total Investments, Quantity | loan	37
Total Investments, Principal Balance	$ 181,174
Total Investments, Book Value	$ 149,766	96,036
Total Investments, Weighted Average Contractual Interest Rate / Rate of Return	10.30%
Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	5
Loans Receivable, Principal Balance	$ 45,064
Loans Receivable, Book Value	$ 42,664	38,262
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	9.20%
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	2
Loans Receivable, Principal Balance	$ 2,354
Loans Receivable, Book Value	$ 2,418	842
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	8.00%
Mezzanine [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	2
Loans Receivable, Principal Balance	$ 34,640
Loans Receivable, Book Value	$ 28,391	9,656
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	10.30%
Pre-development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	1
Loans Receivable, Principal Balance	$ 2,357
Loans Receivable, Book Value	$ 2,357	4,023
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	9.00%
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	14
Loans Receivable, Principal Balance	$ 44,926
Loans Receivable, Book Value	$ 27,859	0
Loans Receivable, Weighted Average Contractual Interest Rate / Rate of Return	8.60%
Debtor-in-possession [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Quantity | loan	0
Loans Receivable, Principal Balance	$ 0
Loans Receivable, Book Value	$ 0	$ 813