OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Intangible liabilities
Net	$ (2,359)		$ (2,872)
Future accretion of acquisition related intangible liabilities
Net	(2,359)		(2,872)
Acquired Below-Market Leases
Intangible liabilities
Gross balance	(4,812)		(6,618)
Accumulated amortization	2,453		3,746
Net	$ (2,359)		$ (2,872)
Average useful life (in years)	4 years		4 years
Future accretion of acquisition related intangible liabilities
2019 (Nine months ending December 31, 2019)	$ (1,077)
2020	(701)
2021	(347)
2022	(234)
2023	0
Thereafter	0
Net	(2,359)		$ (2,872)
Acquired Above-Market Leases
Intangible assets
Gross balance	146		146
Accumulated amortization	(72)		(51)
Net	$ 74		$ 95
Average useful life (in years)	3 years		3 years
Amortization
Amortization expense	$ 21	$ 12
Future amortization of acquisition related intangible assets
2019 (Nine months ending December 31, 2019)	42
2020	9
2021	5
2022	5
2023	6
Thereafter	7
Net	74		$ 95
Acquired In-Place Leases
Intangible assets
Gross balance	14,117		16,210
Accumulated amortization	(8,335)		(9,731)
Net	$ 5,782		$ 6,479
Average useful life (in years)	8 years		8 years
Amortization
Amortization expense	$ 601	912
Future amortization of acquisition related intangible assets
2019 (Nine months ending December 31, 2019)	1,511
2020	1,349
2021	899
2022	663
2023	375
Thereafter	985
Net	5,782		$ 6,479
Trade Name and License
Intangible assets
Gross balance	2,957		2,957
Accumulated amortization	0		0
Net	2,957		2,957
Future amortization of acquisition related intangible assets
Net	2,957		$ 2,957
Rental and Other Property Income | Acquired Below-Market Leases
Amortization
Amortization expense	$ 513	$ 713