OTHER INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities and Related Accumulated Amortization and Accretion (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Intangible lease assets:
Intangible lease assets, net	$ 5,754	$ 6,313
Intangible lease liabilities:
Acquired below-market leases, accumulated amortization	$ 1,174	$ 1,786
Acquired finite lived intangible lease liabilities average useful life	5 years	4 years
Acquired below-market leases, net of accumulated amortization of $1,174 and $1,786, respectively, with an average useful life of 5 and 4 years, respectively	$ 388	$ 587
Acquired below-market leases
Intangible lease liabilities:
Acquired below-market leases, net of accumulated amortization of $1,174 and $1,786, respectively, with an average useful life of 5 and 4 years, respectively	388	587
Acquired in-place Leases
Intangible lease assets:
Intangible lease assets, accumulated amortization	$ 8,744	$ 9,228
Acquired finite lived intangible lease assets average useful life	9 years	8 years
Intangible lease assets, net	$ 2,763	$ 3,316
Acquired above-market leases
Intangible lease assets:
Intangible lease assets, accumulated amortization	$ 21	$ 15
Acquired finite lived intangible lease assets average useful life	6 years	6 years
Intangible lease assets, net	$ 34	$ 40
Trade name and license
Intangible lease assets:
Intangible lease assets, net	$ 2,957	$ 2,957