MORTGAGE LOANS, NET - Loans by Maturity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($)
Mortgage Loans on Real Estate [Line Items]
Outstanding Balance	$ 36,297	$ 32,717
Less: purchase discount, net of accumulated amortization		(367)
Less: valuation allowance	(13,063)	(12,682)	$ (12,682)
Net carrying value	$ 23,234	$ 19,668	$ 378
Total Loan Percentage	100.00%	100.00%
Total Number of Loans | Loan	6	4
Matured [Member]
Mortgage Loans on Real Estate [Line Items]
Outstanding Balance	$ 20,999	$ 12,682
Percentage of Loans	57.90%	38.80%
Number of Loans | Loan	3	2
Q3 2018 [Member]
Mortgage Loans on Real Estate [Line Items]
Outstanding Balance		$ 7,696
Percentage of Loans		23.50%
Number of Loans | Loan		1
Q4 2019 [Member]
Mortgage Loans on Real Estate [Line Items]
Outstanding Balance	$ 15,298	$ 12,339
Percentage of Loans	42.10%	37.70%
Number of Loans | Loan	3	1