LOANS RECEIVABLE AND OTHER INVESTMENTS - Loans Receivable and Other Investments (Details)	Dec. 31, 2018 USD ($) Investment	Dec. 31, 2017 USD ($)
Loans Receivable:
Quantity \| Investment	22
Principal Balance	$ 96,492,000
Book Value	$ 70,718,000	$ 66,004,000
Weighted Average Contractual Interest Rate / Rate of Return	8.50%
Weighted Average Annualized Effective Interest Rate / Rate of Return	9.70%
Loan loss reserve	$ (1,258,000)	(97,000)
Loans Receivable, Net Amount	$ 69,460,000	65,907,000
Preferred Equity
Quantity \| Investment	9
Principal Balance	$ 43,851,000	48,035,000
Book Value	$ 44,262,000	48,483,000
Weighted Average Contractual Interest Rate / Rate of Return	12.10%
Weighted Average Annualized Effective Interest Rate / Rate of Return	12.10%
Total Quantity \| Investment	31
Total Principal Balance	$ 140,343,000
Total Book Value	$ 113,722,000	114,390,000
Total Weighted Average Contractual Interest Rate / Rate of Return	9.60%
Total Weighted Average Annualized Effective Interest Rate / Rate of Return	10.60%
Mortgage
Loans Receivable:
Quantity \| Investment	1
Principal Balance	$ 18,577,000
Book Value	$ 18,577,000	12,351,000
Weighted Average Contractual Interest Rate / Rate of Return	10.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	10.00%
Construction
Loans Receivable:
Quantity \| Investment	2
Principal Balance	$ 4,569,000
Book Value	$ 4,629,000	2,733,000
Weighted Average Contractual Interest Rate / Rate of Return	8.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	7.70%
Mezzanine
Loans Receivable:
Quantity \| Investment	1
Principal Balance	$ 23,952,000
Book Value	$ 2,188,000	10,239,000
Weighted Average Contractual Interest Rate / Rate of Return	10.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	41.90%
Pre-development
Loans Receivable:
Quantity \| Investment	0
Principal Balance	$ 0
Book Value	$ 0	2,357,000
Other
Loans Receivable:
Quantity \| Investment	18
Principal Balance	$ 49,394,000
Book Value	$ 45,324,000	$ 38,324,000
Weighted Average Contractual Interest Rate / Rate of Return	7.30%
Weighted Average Annualized Effective Interest Rate / Rate of Return	8.10%

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For investments which are quantified by principal amount, the principle balance held at close of period.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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