LOANS RECEIVABLE AND OTHER INVESTMENTS - Composition of Loans Receivable and Other Investments (Details) $ in Thousands	Sep. 30, 2019 USD ($) preferred_equity_investment Investment loan	Dec. 31, 2018 USD ($)
Loans Receivable:
Quantity \| loan	20
Principal balance	$ 68,486	$ 96,492
Book Value	$ 64,608	70,718
Weighted Average Contractual Interest Rate / Rate of Return	7.70%
Weighted Average Annualized Effective Interest Rate / Rate of Return	8.00%
Loan loss reserve	$ (783)	(1,258)
Loans receivable, net amount	$ 63,825	69,460
Other Investments:
Quantity \| preferred_equity_investment	9
Principal Balance	$ 44,005	43,851
Book Value	$ 44,417	44,262
Weighted Average Contractual Interest Rate / Rate of Return	12.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	12.00%
Total Quantity \| Investment	29
Total Principal Balance	$ 112,491
Total Book Value	$ 108,242	113,722
Total Weighted Average Contractual Interest Rate / Rate of Return	9.40%
Total Weighted Average Annualized Effective Interest Rate / Rate of Return	9.60%
Mortgage
Loans Receivable:
Quantity \| loan	1
Principal balance	$ 19,000
Book Value	$ 19,000	18,577
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 \| loan	2
Principal balance	$ 5,884
Book Value	$ 5,935	4,629
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 \| loan	0
Principal balance	$ 0
Book Value	$ 0	2,188
Other
Loans Receivable:
Quantity \| loan	17
Principal balance	$ 43,602
Book Value	$ 39,673	$ 45,324
Weighted Average Contractual Interest Rate / Rate of Return	6.70%
Weighted Average Annualized Effective Interest Rate / Rate of Return	7.10%

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and other investments held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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

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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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