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REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Unamortized Balances of Intangible Lease Assets and Liabilities (Details) - Rental income, net $ in Thousands	Dec. 31, 2018 USD ($)
Amortization of intangible lease liabilities - below market leases
2019	$ 1,668
2020	1,531
2021	1,492
2022	1,380
2023	984
Thereafter	6,958
Total	14,013
Intangible lease asset - above market lease
Amortization of intangible lease assets - above market leases
2019	677
2020	651
2021	645
2022	479
2023	286
Thereafter	956
Total	$ 3,694

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