MORTGAGE LOANS, NET - Loan Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Movement in Mortgage Loans On Real Estate Principal Amount [Roll Forward]
Principal Outstanding, Beginning Balances	$ 31,820	$ 12,601
Principal Outstanding, Additions:
Mortgage loan originated	3,000
Accretion of mortgage income	748	258
Accretion of origination fees	16
Accrued interest revenue	0	0
Mortgage loan purchased		19,875
Principal Outstanding, Reductions:
Mortgage loan origination fee	70
Interest repayments	0	0
Elimination of loan upon consolidation		(289)
Mortgage loan discount		(625)
Principal Outstanding, Ending Balances	35,514	31,820
Movement in Mortgage Loans On Real Estate Interest Receivable [Roll Forward]
Interest Receivable, Beginning Balances	530	459
Additions, Interest Receivable:
Mortgage loan originated	0
Accretion of mortgage income	0	0
Accretion of origination fees	0
Accrued interest revenue	2,190	686
Mortgage loan purchased		0
Reductions, Interest Receivable:
Mortgage loan origination fee	0
Interest repayments	(1,937)	(495)
Elimination of loan upon consolidation		(120)
Mortgage loan discount		0
Interest Receivable, Ending Balances	783	530
Movement in Allowance for Loan and Lease Losses, Real Estate [Roll Forward]
Valuation Allowance, Begining Balances	(12,682)	(12,682)
Valuation Allowance, Additions:
Mortgage loan originated	0
Accretion of mortgage income	(381)	0
Accretion of origination fees	0
Accrued interest revenue	0	0
Mortgage loan purchased		0
Valuation Allowance, Reductions:
Mortgage loan origination fee	0
Interest repayments	0	0
Elimination of loan upon consolidation		0
Mortgage loan discount		0
Valuation Allowance, Ending Balances	(13,063)	(12,682)
Movement in Mortgage Loans on Real Estate [Roll Forward]
Mortgage Loans, Beginning Balances, Carrying Value	19,668	378
Net Carrying Value, Additions :
Mortgage loan originated	3,000
Accretion of mortgage income	367	258
Accretion of origination fees	16
Accrued interest revenue	2,190	686
Mortgage loan purchased		19,875
Net Carrying Value, Reductions :
Mortgage loan origination fee	(70)
Interest repayments	(1,937)	(495)
Elimination of loan upon consolidation		(409)
Mortgage loan discount		(625)
Mortgage Loans, Ending Balances, Carrying Value	$ 23,234	$ 19,668