LOANS RECEIVABLE AND OTHER INVESTMENTS - Composition of Loans Receivable and Other Investments (Details) $ in Thousands	Mar. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($)
Loans Receivable:
Quantity \| loan	21
Principal Balance	$ 76,212
Book Value	$ 50,840	$ 66,004
Weighted Average Contractual Interest Rate / Rate of Return	9.40%
Weighted Average Annualized Effective Interest Rate / Rate of Return	12.00%
Loan loss reserve	$ (200)	(97)
Loans Receivable, Net Amount	$ 50,640	65,907
Other Investments:
Quantity \| loan	13
Principal Balance	$ 49,782	48,035
Book Value	$ 50,248	48,483
Weighted Average Contractual Interest Rate / Rate of Return	12.60%
Weighted Average Annualized Effective Interest Rate / Rate of Return	12.60%
Total Quantity \| loan	34
Total Principal Balance	$ 125,994
Total Book Value	$ 100,888	114,390
Total Weighted Average Contractual Interest Rate / Rate of Return	10.70%
Total Weighted Average Annualized Effective Interest Rate / Rate of Return	12.30%
Mortgage
Loans Receivable:
Quantity \| loan	2
Principal Balance	$ 18,028
Book Value	$ 17,032	12,351
Weighted Average Contractual Interest Rate / Rate of Return	9.90%
Weighted Average Annualized Effective Interest Rate / Rate of Return	11.00%
Construction
Loans Receivable:
Quantity \| loan	2
Principal Balance	$ 3,047
Book Value	$ 3,114	2,733
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	1
Principal Balance	$ 25,000
Book Value	$ 2,548	10,239
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 \| loan	1
Principal Balance	$ 2,357
Book Value	$ 2,357	2,357
Weighted Average Contractual Interest Rate / Rate of Return	9.00%
Weighted Average Annualized Effective Interest Rate / Rate of Return	8.40%
Other
Loans Receivable:
Quantity \| loan	15
Principal Balance	$ 27,780
Book Value	$ 25,789	$ 38,324
Weighted Average Contractual Interest Rate / Rate of Return	8.70%
Weighted Average Annualized Effective Interest Rate / Rate of Return	10.60%

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

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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 leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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